E50SN12051

600W Non-isolated 1/8th Brick DCDC Power Modules

Features
Electrical
 Peak Efficiency up to 97.3% @54Vin
 PMBus communication
 Fully regulated output voltage
 Fully protected: Input UVLO. Output OVP, OCP
and OTP
 Monotonic and pre-biased startup
 No minimum load required
 Non-isolated

Mechanical
 Size: 58.4x22.8x12.7mm

Safety & Reliability

 IEC/EN/UL/CSA 62368-1, 2nd edition
 IEC/EN/UL/CSA 60950-1, 2nd edition+A2
 ISO 9001, TL 9000, ISO 14001, QS 9000,
OHSAS18001 certified manufacturing facility

Input voltage: 40~60V Soldering Method

Output Voltage: 12V  Wave soldering
 Hand soldering
Output Power: 600W  Reflow soldering (MSL3)

Recommended Part Number

Model Name Input Output Eff. @ 50% Load Others

E50SN12051NKDB 40~60V 16A 12V 600W 97.3% @54Vin Negative on/off

E50SN12051NKDHF 40~60V 16A 12V 600W 97.3% @54Vin Negative on/off

Part Numbering System

E 50 S N 120 51 N K D (note) H F
Number
Form Input Product Output Output ON/OFF Pin
Of Pin Assignment Option Code Customer Specific
Factor Voltage Series Voltage current Logic Length
Outputs

E- 50 - S- N- 120 - 51 - 51A N – Negative R - 0.170” D - Digital pins H - With Omit - Standard

Eighth 40~60V Single Series 12.0V R - Negative N - 0.145”
baseplate F - Halogen free
A - Analog pins
Brick Number and compliant B- With
K - 0.110”
Reflow process baseplate
Note:
1. A - Analog pins: without digital pins (pin6~12)
2. D - Digital pins: with digital pins (pin6~12)

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P1
 TECHNICAL SPECIFICATIONS
(TA=25°C, airflow rate=300 LFM, Vin=54Vdc, nominal Vout unless otherwise noted.)

PARAMETER NOTES and CONDITIONS

Min. Typ. Max. Units
ABSOLUTE MAXIMUM RATINGS
Input Voltage Vdc
Continuous 0 70 Vdc
Transient 100mS 75 Vdc
Operating Ambient Temperature (Ta) -40 85 °C
Storage Temperature -55 125 °C
INPUT CHARACTERISTICS
Operating Input Voltage 40 54 60 Vdc
Input Under-Voltage Lockout
Turn-On Voltage Threshold 38 39 40 Vdc
Turn-Off Voltage Threshold 36 37 38 Vdc
Lockout Hysteresis Voltage 2 Vdc
Maximum Input Current Full Load, 40Vin 17 A
No-Load Input Current Vin=54V, Io=0A 100 mA
Off Converter Input Current Vin=54V 15 mA
Input Terminal Ripple current RMS, with 100uF input cap 100 mArms
OUTPUT CHARACTERISTICS
Output Voltage Set Point Vin=54V, Io=Open Load, Tc=25°C 12.20 Vdc
Vin=54V, Io=Full Load, Tc=25°C 11.80 Vdc
Output Regulation
Load Regulation Vin=54V, Io=Io min to Io max 400 mV
Line Regulation Vin=40V to 60V, Io=full load 2 %Vo,set
Temperature Regulation Ta= -40°C to 85°C -1 0 1 %Vo,set
Total Output Voltage Range Over sample load, line and temperature 11.6 12.4 V
Output Voltage Ripple and Noise 5Hz to 20MHz bandwidth
Peak-to-Peak Full Load, Co=1000uF, 1µF ceramic, 10µF tantalum 85 120 mV
RMS Full Load, Co=1000uF, 1µF ceramic, 10µF tantalum 25 50 mV
Operating Output Current Range 0 51 A
Output Over Current Protection(hiccup mode) when Vo<10%Vo.nom 110 120 130 %Io,max
Output Over Voltage Protection(hiccup mode) 15.6 V
DYNAMIC CHARACTERISTICS
Output Voltage Current Transient Co=1000 µF, 1A/µs
Positive Step Change in Output Current 75% Io.max to 50% Io.max 180 mV
Negative Step Change in Output Current 50% Io.max to 75% Io.max 180 mV
Settling Time (within 1% nominal Vout) 200 µs
Turn-On Delay Time
Start-Up Delay Time From Input Voltage On/Off=On, from Vin=Turn-on Threshold to Vo=10% Vo,nom 125 mS
Start-Up Delay Time From On/Off Control Vin=Vin,nom, from On/Off=On to Vo=10% Vo,nom 10 mS
Output Voltage Rise Time Vo=10% to 90% Vo,nom 5 15 mS
Output Capacitance Range 20% ceramic, 80% Oscon or AL 1000 5000 µF
EFFICIENCY
Half Load Efficiency 50% Load @Vin=54Vdc 97.3 %
Full Load Efficiency 100% Load @Vin=54Vdc 96.5 %
FEATURE CHARACTERISTICS
Switching Frequency Vin=40~60V 250 KHz
On/Off Control
Logic Low Von/off 0.8 V
Logic High Von/off 2.4 20 V
ON/OFF Current Ion/off at Von/off=0.0V 0.3 mA
Leakage Current Logic High, Von/off=15V 10 500 uA
Voltage when floating On/off pin un-connected 3 V
GENERAL SPECIFICATIONS
MTBF Io=80% of Io, max; Ta=25°C 5.3 Mhours
Weight With Base-plate 45 grams
Over-Temperature Shutdown Refer to Figure 17 for Hot spot 1 location
132 °C
(With Base-plate) (54Vin, 80% Io, 200LFM,Airflow from Vin- to Vin+ )
Over-Temperature Shutdown Refer to Figure 19 for Hot spot 2 location
132 °C
(With 0.5” Height Heat Sink ETL050A) (54Vin, 80% Io, 200LFM,Airflow from Vin- to Vin+ )
Over-Temperature Shutdown (NTC Resistor) *Note 135 °C
Note: Please attach thermocouple on NTC resistor to test OTP function, the hot spots’ temperature is just for reference.
PMBUS SIGNAL INTERFACE CHARACTERISTICS
Logic Input Low (VIL) Data, SMBAlert, Clock pin 0 0.8 V
Logic Input High (VIH) Data, SMBAlert, Clock pin 2.4 3.6 V
Logic Output Low (VOL) Data, SMBAlert, Clock pin; IOL=4mA 0.4 V
Logic Output High (VOH) Data, SMBAlert, Clock pin; IOH=-4mA 2.5 V
PMBus Operating Frequency Range 100 400 KHz
PMBUS MONITORING CHARACTERISTICS
Output Current Reading Accuracy Vin=54V, Io=50% ~ 100% of Io, max; -10 +10 %
Vin=54V, Io=5% ~ 50% of Io, max; -5 +5 A
Output Voltage Reading Accuracy -2 +2 %
Input Voltage Reading Accuracy -4 +4 %
Temperature Reading Accuracy -5 +5 ℃

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P2
 MECHANICAL CONSIDERATIONS

Mechanical Drawing (with Baseplate)

Recommended Layout

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P3
 APPLICATION SCHEMATIC

Typical Application Schematic

Vin+(1) Vout+(5)

Cin DCDC module

Cout
Input ON/OFF(2) Output

Sig_GND(7)
C2,Pgood(6)

Addr0(12)
Addr1(11)
Clock(10)
Alert(9)
Data(8)
Vin-(3) Vout-(4)

3.3V

1k×3

R1 R2 R3
Data
3.3V
Alert
MCU Clock 1k
SGND Power good
C1 C2 C3

R1/R2/R3/C1/C2/C3 value are 49.9ohm/49.9ohm/49.9ohm /10p/10p/10p, and should be close to brick in application.

Position Vendor P/N Description QTY Vendor Note

PCR1K470MCL1GS 80V/47uF/10*10 2 Nichicon

Near to the Vin+ and
Cin
Vin- pin of the Module
/ 100V/2.2uF/X7R/1206/MLCC 3 /

/ 16V/22uF/X7R/1206/MLCC 6 /
Near to the Vo+ and
Cout
Vo- pin of the Module
PCR1C102MCL1GS 16V/1000uF/10*12.7 1 Nichicon

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P4
 ELECTRICAL CHARACTERISTICS CURVES

TA=25°C

Figure 1: Efficiency vs. Output Power Figure 2: Loss vs. Output Power

Figure 3: Full Load Input Characteristics Figure 4: Output Voltage vs. Load Current

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P5
 ELECTRICAL CHARACTERISTICS CURVES

TA=25°C,

Figure 5: Remote On/Off (negative logic) at full load Figure 6: Input Voltage Start-up at full load
Vin=54V, Iout = Io, max Vin=54V, Iout = Io, max
Time: 10ms/div. Time: 40ms/div.
Vout (top trace): 4V/div; Vout (top trace): 4V/div;
Vremote On/Off signal (bottom trace): 2V/div. Vin (bottom trace): 30V/div.

Figure 7: Transient Response Figure 8: Transient Response

(Vin=54V, 1A/µs step change in load from 50% to 75% of Io, (Vin=54V, 1A/µs step change in load from 75% to 50% of Io, max)
max) Vout (top trace): 0.2 V/div, 200us/div; Vout (top trace):0.2V/div, 400us/div;
Iout (bottom trace): 20A/div. Iout (bottom trace): 20A/div.
Scope measurement should be made using a BNC cable Scope measurement should be made using a BNC cable
(length shorter than 20 inches). Position the load between 51 (length shorter than 20 inches). Position the load between 51
mm to 76 mm (2 inches to 3 inches) from the module mm to 76 mm (2 inches to 3 inches) from the module

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P6
 ELECTRICAL CHARACTERISTICS CURVES

TA=25°C, Vin=54Vdc

Figure 9: Test Setup Diagram for Input Ripple Current Figure 10: Input Terminal Ripple Current, ic, at max output
Note: Measured input reflected-ripple current with a simulated current and nominal input voltage with 12µH source impedance
source Inductance of 12μH. Measure current as shown above. and 100µF electrolytic capacitor (100 mA/div, 2us/div).

Figure 11: Test Setup for Output Voltage Noise and Ripple Figure 12: Output Voltage Ripple and Noise at nominal
input voltage and max load current (20 mV/div, 2us/div)
Load cap: 1000uF, 20% ceramic, 80% Oscon.
Bandwidth: 20MHz.

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P7
 DESIGN CONSIDERATIONS
Input Source Impedance DC input is considered as SELV circuit, double/reinforced
insulation shall be provided between SELV circuit and AC
The impedance of the input source connecting to the DC/DC mains/Primary circuit.
power modules will interact with the modules and affect the
stability. A low ac-impedance input source is recommended. For IEC/EN/UL/CSA 62368-1:
A low ESR electrolytic capacitor higher than 100μF (ESR < DC input and DC output are considered as ES1 circuit,
0.7Ω at 100kHz) is suggested. functional insulation is investigated between input circuit
and output circuit.
Layout and EMC Considerations DC input is considered as ES1, double/reinforced safeguard
shall be provided between ES1 and MAINS.
Delta’s DC/DC power modules are designed to operate in a
wide variety of systems and applications. For design This power module is not internally fused. To achieve
assistance with EMC compliance and related PWB layout optimum safety and system protection, an input line fuse is
issues, please contact Delta’s technical support team. highly recommended. The safety agencies require a fast-
Schematic and Components List blow fuse with 30A maximum rating to be installed in the
ungrounded lead. A lower rated fuse can be used based on
the maximum inrush transient energy and maximum input
current.

Soldering and Cleaning Considerations

Post solder cleaning is usually the final board assembly
process before the board or system undergoes electrical
testing. Inadequate cleaning and/or drying may lower the
reliability of a power module and severely affect the finished
circuit board assembly test. Adequate cleaning and/or drying
Location Component
is especially important for un-encapsulated and/or open
CX1 2.2uf *2 frame type power modules. For assistance on appropriate
L1 CMLS136E-3R3MS / CYNTEC soldering and cleaning procedures, please contact Delta’s
CX2 100uf/100V+2.2uf*3 technical support team.

Figure 13-1: Recommended Input Filter

Remote On/Off
The remote on/off feature on the module is negative logic.
Negative logic turns the module on during a logic low and off
during a logic high. Remote on/off can be controlled by an
external switch between the on/off terminal and the Vin (-)
terminal. The switch can be an open collector or open drain.
For negative logic if the remote on/off feature is not used,
please short the on/off pin to Vin (-). The DC level on/off signal
is suggested.

Figure 13-2: Test Result of EMC (Vin=54V, Io=51A).

Safety Considerations
The power module must be installed in compliance with the
spacing and separation requirements of the end-user’s safety
agency standard, i.e., IEC 62368-1: 2014 (2nd edition), EN
62368-1: 2014 + A11: 2017, UL 62368-1, 2nd Edition, 2014- Figure 14: Remote On/Off Implementation
12-01 and CSA C22.2 No. 62368-1-14, 2nd Edition, 2014-12.
IEC 60950-1: 2005, 2nd Edition + A1: 2009 + A2: 2013, EN Over-Current Protection
60950-1: 2006 + A11: 2009 + A1: 2010 + A12: 2011 + A2:
2013, UL 60950-1, 2nd Edition, 2019-05-09 and CSA C22.2 The modules include an internal output over-current
No. 60950-1-07, 2nd Edition, 2014-10, if the system in which protection circuit, which will endure current limiting for an
the power module is to be used must meet safety agency unlimited duration during output overload. If the output
requirements. current exceeds the OCP set point, the modules will shut
down (hiccup mode). The modules will try to restart after
shutdown. If the overload condition still exists, the module will
For IEC/EN/UL/CSA 60950-1:
shut down again. This restart trial will continue until the
DC input and DC output are considered as SELV circuits,
overload condition is corrected.
functional insulation is investigated between input circuit
and output circuit.

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P8
 DESIGN CONSIDERATIONS
Over-Voltage Protection the form of decimal digits; Each pin offers one decimal digit,
and then combine together to form the decimal address as
The modules include an internal input over-voltage protection shown in below.
circuit, which monitors the voltage on the input terminals. If
this voltage exceeds the over-voltage set point, the protection Address = 8 * ADDR1 + ADDR0
circuit will shut down, and then restart with a time delay after
the fault no long exist.

Over-Temperature Protection
The over-temperature protection consists of circuitry that
provides protection from thermal damage. If the temperature
exceeds the over-temperature threshold the module will shut
down. The module will restart after the temperature is within
specification.

PMBus Communication Corresponded to each decimal digit, the requested resistor

values are shown in below, and +/-1% resistors accuracy can
The module has a digital PMBus interface to allow the module be accepted. If there are any resistances exceeding the
to be monitored, controlled and configured by the system. requested range, address 126 will be return. 0-12 and 40, 44,
The module supports 5 PMBus signal lines, Data, Clock, 45, 55 and 63 in decimal address can’t be used, since they
SMBALERT (optional), and 2 Address line Addr0 and Addr1. are reserved according to the SMBus specifications, and
More detail PMBus information can be found in the PMB which will also return address 126.
Power Management Protocol Specification, Part I and part II,
revision 1.2; which is shown in http://pmbus.org . Both Octal digit Resistor(Kohm)
100kHz and 400kHz bus speeds are supported by the 0 10
module. Bus free time between Stop and Start Condition 1 15.4
must be more than 200us. Connection for the PMBus
2 23.7
interface should be following the High Power DC
3 36.5
specifications given in section 3.1.3 in the SMBus
4 54.9
specification V2.0 or the Low Power DC specifications in
section 3.1.2. The complete SMBus specification is shown in 5 84.5
http://smbus.org. 6 130
7 200
The module supports the Packet Error Checking (PEC)
protocol. It can check the PEC byte provided by the PMBus PMBus Data Format
master, and include a PEC byte in all message responses to
the master. The module receives and report date in LINEAR format.
The Exponent of the data words is fixed at a reasonable
SMBALERT protocol is also supported by the module. value for the command; altering the exponent is not
SMBALERT line is also a wired-AND signal; by which the supported. DIRECT format is not supported by the module.
module can alert the PMBUS master via pulling the
SMBALERT pin to an active low. There are two ways that the For commands that set or report any voltage thresholds
master and the module response to the alert of SMBALERT related to the output voltage, the module supports the linear
line. data format consisting of a two-byte value with a 16-bit,
unsigned mantissa, and a fixed exponent of -9. The format
One way is for the module used in a system that does not of the two data bytes is shown below:
support Alert Response Address (ARA). The module is to
retain its resistor programmed address, when it is in an
ALERT active condition. The master will communicate with
the slave module using the programmed address, and using
the various READ_STATUS commands to find who cause for
the SMBALERT. The CLEAR_FAULTS command will clear
the SMBALERT.

The module contains a data flash used to store configuration

settings, which will not be programmed into the device data The equation can be written as:
flash automatically. The STORE_DEFAULT_ALL command
must be used to commit the current settings are transfer from Vout = Mantissa x 2-9
RAM to data flash as device defaults.
For example, considering set Vout to 12V by
PMBUS Addressing VOUT_COMMAND, the read/write data can be calculated
refer to below process:
The Module has flexible PMBUS addressing capability. When 1. Mantissa =Vout/2-9= 12/2-9=6144;
connect different resistor from Addr0 and Addr1 pin to GND 2. Converter the calculated Mantissa to hexadecimal
pin, 64 possible addresses can be acquired. The address is in 0xC000.

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 DESIGN CONSIDERATIONS

For example, considering set the turn on threshold of input

under voltage lockout to 34V by VIN_ON command; the
read/write data can be calculated refer to below process:

1. Get the exponent of Vin, -3; whose binary is 11101

2. Mantissa =Vin/2-3=34/2-3=272;
3. Converter the calculated Mantissa to hexadecimal 110,
then converter to binary 00100010000;
4. Combine the exponent and the mantissa, 11101 and
00100010000;
5. Converter binary 1110100100010000 to hexadecimal
E910.

The detail exponent and resolution of main parameter is

summarized as below:

Exponent Resolution
Vin -3 0.125V
Vo -9 19.53mV
Io -4 62.5mA
Temperature -2 /
Switching frequency -2 1Khz
Time -1 0.5ms

Supported PMBus Commands

The main PMBus commands described in the PMBus 1.2
specification are supported by the module. Partial PMBus
commands are fully supported; Partial PMBus commands
have difference with the definition in PMBus 1.2
specification. All the supported PMBus commands are
detail summarized in below table.

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P10
 DESIGN CONSIDERATIONS
The main PMBus commands described in the PMBus 1.2 specification are supported by the module. Partial PMBus
commands are fully supported; Partial PMBus commands have difference with the definition in PMBus 1.2
specification. All the supported PMBus commands are detail summarized in below table.

Compatible
Command Command Transfer with standard Data Default Range Data Expon
Command Note
Code description type PMBUS or Format value limit units -ent
not?
R/W Refer to below
OPERATION 0x01 Turn on or off Bit field 0x80 / / / /
byte description;
Configures primary R/W 0x1D (Neg Logic);
ON_OFF_CONFIG 0x02 Yes Bit field 0x1D / / /
on/off & command byte 0x1F (Pos Logic);
Clear any fault bits Send
CLEAR_FAULTS 0x03 Yes / / / / / /
that have been set byte
Control writing to R/W To protect accidental
WRITE_PROTECT 0x10 Yes / 0x80 / / /
the PMBUS device. byte changes.
The FLASH must be
unlocked (referring to
Command 0xEC) before
Stores operating
Send sending this command.
STORE_DEFAULT_ALL 0x11 parameters from Yes / / / / /
byte This command is effective
RAM to data flash
to the parameter of all
command in the table
except 0xEC
Restores operating This command can't be
Send
RESTORE_DEFAULT_ALL 0x12 parameters from Yes / / / / / issued when the power unit
byte
data flash to RAM is running.
Read the PMBUS Read Only for
PMBUS_CMD_CAPABILITY 0x19 Yes / 0xB0 / / /
capability byte E50SN12051NKDHF
Read Vo data Read
VOUT_MODE 0x20 Yes mode+exp 0x17 / / / /
format byte
Read the output Read
VOUT_COMMAND 0x21 Yes Vout Linear 12.2 / V -9 /
voltage word
Read the switching Read Frequency
FREQUENCY_SWITCH 0x33 Yes 250 / KHz -2 /
frequency word linear
Read the turn on
VIN_ON should be higher
voltage threshold of R/W
VIN_ON 0x35 Yes Vin Linear 39 38~40 V -3 than VIN_OFF, and keep
Vin under voltage word
2V hysteresis.
lockout
Read the turn off
VIN_ON should be higher
voltage threshold of R/W
VIN_OFF 0x36 Yes Vin Linear 37 36~38 V -3 than VIN_OFF, and keep
Vin under voltage word
2V hysteresis.
lockout

Must be higher than the

Set the output
R/W value of
VOUT_OV_FAULT_LIMIT 0x40 overvoltage fault Yes Vout Linear 15.6 13~17 V -9
word VOUT_COMMAND and
threshold.
VOUT_OV_WARN_LIMIT;

Set a threshold Must be the same or less

causing an output R/W than
VOUT_OV_WARN_LIMIT 0x42 Yes Vout Linear 13 13~17 V -9
voltage high word VOUT_OV_FAULT_LIMIT
warning. value
Must be greater than
IOUT_OC_WARN_LIMIT
Set the output value
R/W
IOUT_OC_FAULT_LIMIT 0x46 overcurrent fault Yes Iout Linear 60 25~60 A -4 Write Only for
word
threshold. E50SN12051NKDHF
Read for E50SN12051
series all parts.
Set a threshold
Must be less than
causing an output R/W
IOUT_OC_WARN_LIMIT 0x4A Yes Iout Linear 56 25~60 A -4 IOUT_OC_FAULT_LIMIT
current high word
value
warning.
Set the over
R/W TEMP Must be greater than
OT_FAULT_LIMIT 0x4F temperature fault Yes 135 25~135 ℃ -2
word Linear OT_WARN_LIMIT value
threshold.

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P11
 DESIGN CONSIDERATIONS
Compatible
Command Transfer with standard Data Default Range Data Expon
Command Command description Note
Code type PMBUS or Format value limit units -ent
not?
Set a threshold causing Must be less than
TEMP
OT_WARN_LIMIT 0x51 a temperature high R/W word Yes 120 25~135 ℃ -2 OT_FAULT_LIMIT
Linear
warning. value
Set the input Vin Only for
VIN_OV_FAULT_LIMIT 0x55 overvoltage fault R/W word Yes 80 60~80 V -3
Linear E50SN12051NKDHF
threshold
Instructs what action to
VIN_OV_FAULT_RESPON take in response to an Only for
0x56 R/W word Yes Bit field 0xF8 / / /
SE input overvoltage fault. E50SN12051NKDHF
Sets the output voltage
at which the bit 3 of Must be greater than
Read Vout
POWER_GOOD_ON 0x5E STATUS_WORD high Yes 11 / V -9 POWER_GOOD_OF
word Linear
byte should be F value
asserted.
Sets the output voltage
Must be less than
at which the bit 3 of Read Vout
POWER_GOOD_OFF 0x5F Yes 10 / V -9 POWER_GOOD_ON
STATUS_WORD high word Linear
value
byte should be negated.
Sets the time from input
voltage condition is Time
TON_DELAY 0x60 R/W word Yes 3 3~75 ms -1 /
received until the output Linear
voltage starts to rise
Sets the time from the
output starts to rise until Read Time
TON_RISE 0x61 Yes 10 / ms -1 /
the voltage has entered word Linear
the regulation band.
Returns the information ALL of the warning
Refer to below
STATUS_WORD 0x79 with a summary of the R/W word Bit field / / / / or fault bits set in
description;
module's fault/warning
the status registers
Returns the information remain set, even if
of the module's output Refer to below
STATUS_VOUT 0x7A
voltage related
R/W byte
description;
Bit field / / / / the fault or warning
fault/warning condition is
removed or
Returns the information
of the module's output Refer to below
corrected, until one
STATUS_IOUT 0x7B
current related
R/W byte
description;
Bit field / / / / of the following
fault/warning occur:
Returns the information 1) The bit is
of the module's input Refer to below individually
STATUS_INPUT 0x7C R/W byte Bit field / / / / cleared;
over voltage and under description;
voltage fault 2) The device
Returns the information receives a
of the module's Refer to below CLEAR_FAULTS
STATUS_TEMPERATURE 0x7D R/W byte Bit field / / / /
temperature related description; command;
fault/warning 3) Bias power is
Returns the information removed from the
STATUS_CML 0x7E
of the module's
R/W byte
Refer to below
Bit field / / / / module.
communication related description;
faults.
Returns the input Read Vin
READ_VIN 0x88 Yes / / V -3 /
voltage of the module word Linear
Returns the output Read Vout
READ_VOUT 0x8B Yes / / V -9 /
voltage of the module word Linear
Returns the output Read Iout
READ_IOUT 0x8C Yes / / A -4 /
current of the module word Linear
Returns the module's
Read TEMP
READ_TEMPERATURE_1 0x8D hot spot temperature of Yes / / ℃ -2 /
word Linear
the module
Reads the revision of
PMBUS_REVISION 0x98 Read byte Yes Bit field 0x22 / / / /
the PMBus
PMBUS_CMD_HICCUP_C Set the OCP hiccup Only for
0XB5 R/W byte Yes Bit field 0xFF 0~0xFF / /
OUNT_LIMIT timers E50SN12051NKDHF
Write the key to unlock A data block:7E,15,
PMBUS_CMD_FLASH_KE the Flash before Storing 0xA5A5 DC,42 should be
0xEC R/W No / / /
Y_WRITE operating parameters A5A5 send to unlock the
from RAM to data flash FLASH.

OPERATION [0x01]
Bit number Purpose Bit Value Meaning Default Settings, 0x80
7: Enable/Disable the module 1 Output is enabled 1
0 Output is disabled
6:0 Reserved 0000000

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P12
 DESIGN CONSIDERATIONS
ON_OFF_CONFIG [0x02]
Default Settings
Bit number Purpose Bit Value Meaning 0x1D (negative)
/0x1F (positive)
7:5 Reserved 000
Module does not power up until commanded by
1
Controls how the unit responds the primary ON/OFF pin and the OPERATION
4
to the primary on/off pin and the Module power up at any time regardless of the 1
OPERATION command; 0 state of the primary ON/OFF pin and the
OPERATION
Module responds to the 7 bit in the
Controls how the unit responds 1
3 OPERATION 1
to the OPERATION command
0 Module ignores the 7 bit in the OPERATION
Module requires the primary ON/OFF pin to be
Controls how the unit 1
asserted to start the unit
2 responds to the primary on/off 1
Module ignores the state of the primary
pin 0
ON/OFF pin
Control logic of primary on/off 1 Positive Logic 0, negative;
1
pin 0 Negative Logic 1, positive.
0 Unit turn off delay time control 1 Shut down the module with 0 delay cycle 1

PMBUS_CAPALIBITY [0x19] (Only for E50SN12051NKDHF)

Bit number Purpose Bit Value Meaning
0 Packet Error Checking Not supported
7 Packet Error Checking
1 Packet Error Checking is supported
00 Maximum supported bus speed is 100kHz
01 Maximum supported bus speed is 400kHz
6:5 Maximum Bus Speed
10 Reserved
11 Reserved
The device does not have a SMBALERT# pin
0 and does not support the SMBUS Alert
Response protocol
4 SMBALERT#
The device does have a SMBALERT# pin and
1 does support the SMBUS Alert Response
protocol
3:0 Reserved X Reserved

VIN_OV_FAULT_RESPONSE [0x56] (Only for E50SN12051NKDHF)

Bit number Purpose Bit Value Meaning Default Settings，0XF8

7:6 Response settings 11 Unit shuts down and responds according to the 11
retry settings
5:3 Retry setting 111 Unit continuously restarts while fault is present 111
until commanded off
000 Unit does not attempt to restart on fault
2:0 Delay time setting 000 No delay supported 000

STATUS_WORD [0x79]
High byte
Bit number Purpose Bit Value Meaning
1 Occurred
7 An output over voltage fault or warning
0 No Occurred
1 Occurred
6 An output over current fault or warning
0 No Occurred
An input voltage fault, including over voltage and under 1 Occurred
5
voltage 0 No Occurred
4 Reserved
1 is negated
3 Power_Good
0 ok
2:0 Reserved

Datasheet E-mail: dcdc@deltaww.com

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 DESIGN CONSIDERATIONS

Low byte
Bit number Purpose Bit Value Meaning
7 Reserved
OFF (The unit is not providing power to the output, 1 Occurred
6
regardless of the reason) 0 No Occurred
1 Occurred
5 An output over voltage fault
0 No Occurred
1 Occurred
4 An output over current fault
0 No Occurred
1 Occurred
3 An input under voltage fault
0 No Occurred
1 Occurred
2 A temperature fault or warning
0 No Occurred
1 Occurred；
1 CML (A communications, memory or logic fault）
0 No Occurred
0 Reserved

STATUS_VOUT [0x7A]
Bit number Purpose Bit Value Meaning
7 1 Occurred
Output over voltage fault
0 No Occurred
1 Occurred
6 Output over voltage warning
0 No Occurred
5:0 Reserved

STATUS_IOUT [0x7B]
Bit number Purpose Bit Value Meaning
1 Occurred
7 Output over current fault
0 No Occurred
6 Reserved
1 Occurred
5 Output over current warning
0 No Occurred
4:0 Reserved

STATUS_INPUT [0x7C]
Bit number Purpose Bit Value Meaning
1 Occurred
7 Reserved
0 No Occurred
6: 5 Reserved
1 Occurred；
4 Input under voltage fault
0 No Occurred
3:0 Reserved

STATUS_TEMPERATURE [0x7D]
Bit number Purpose Bit Value Meaning
1 Occurred
7 Over temperature fault
0 No Occurred
1 Occurred
6 Over temperature warning
0 No Occurred
5:0 Reserved

STATUS_CML [0x7E]
Bit number Purpose Bit Value Meaning
7 1 Occurred
Invalid/Unsupported Command Received
0 No Occurred
1 Occurred
6 Invalid/Unsupported Data Received
0 No Occurred
1 Occurred
5 Packet Error Check Failed
0 No Occurred
4:0 Reserved

Datasheet E-mail: dcdc@deltaww.com

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 THERMAL CONSIDERATIONS
Thermal Testing Setup
Thermal management is an important part of the system design. To ensure proper, reliable operation, sufficient cooling of the power
module is needed over the entire temperature range of the module. Convection cooling is usually the dominant mode of heat
transfer.

Hence, the choice of equipment to characterize the thermal performance of the power module is a wind tunnel.

Delta’s DC/DC power modules are characterized in heated vertical wind tunnels that simulate the thermal environments
encountered in most electronics equipment. This type of equipment commonly uses vertically mounted circuit cards in cabinet racks
in which the power modules are mounted.

The following figure shows the wind tunnel characterization setup. The power module is mounted on a 185mmX185mm, 105μm
(3Oz), 6 layers’ test PWB and is vertically positioned within the wind tunnel. The airflow channel width is 73.6mm (2.90”), and the
gap between the airflow channel and top side of the power module is constantly kept at 6.35mm (0.25’’).

FANCING PWB PWB

MODULE

AIR VELOCITY
AND AMBIENT 50.8(2.00")
TEMPERATURE
SURED BELOW
THE MODULE

AIR FLOW

Note: Wind Tunnel Test Setup Figure Dimensions are in millimeters and (Inches)

Figure 15: Wind Tunnel Test Setup

Thermal Derating
Heat can be removed by increasing airflow over the module. To enhance system reliability, the power module should always be
operated below the maximum operating temperature. If the temperature exceeds the maximum module temperature, reliability of
the unit may be affected.

Datasheet E-mail: dcdc@deltaww.com

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 THERMAL CONSIDERATIONS
Thermal Curves (with Base-plate) Thermal Curves
(with 0.5” Height Heat Sink ETL050A)
INPUT OUTPUT
INPUT OUTPUT

Air Flow
Air Flow

OUTPUT INPUT OUTPUT INPUT

Air Flow Air Flow

Figure 16: Hot spot 1 temperature measurement location Figure 18: Hot spot 2 temperature measurement location
The allowed maximum hot spot1 temperature is defined at 118℃. The allowed maximum hot spot2 temperature is defined at 118℃.

E50SN12051(Standard) Output Power vs. Ambient Temperature and Air Velocity E50SN12051(Standard) Output Power vs. Ambient Temperature and Air Velocity
Output Power (W) @Vin = 54V (Transverse Orientation,With Heat Spreader) Output Power (W) @Vin = 54V (Transverse Orientation,With 0.5" Height Heat Sink ETL050A)

600 600

500 500
100LFM 100LFM
200LFM
400 400
300LFM 200LFM

400LFM 300LFM
300 300

400LFM
500LFM
200 200
600LFM 500LFM

600LFM
100 100

0 0
25 30 35 40 45 50 55 60 65 70 75 80 85 25 30 35 40 45 50 55 60 65 70 75 80 85
Ambient Temperature (℃) Ambient Temperature (℃)

Figure 17: Output Power vs. Ambient Temperature and Air Figure 19: Output Power vs. Ambient Temperature and Air
Velocity @Vin = 54V (Transverse Orientation, Airflow from Vin- Velocity @Vin = 54V (Transverse Orientation, Airflow from Vin-
to Vin+, With Base-plate) to Vin+, With 0.5” Height Heat Sink ETL050A)

Datasheet E-mail: dcdc@deltaww.com

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 MANUFACTURE CONSIDERATIONS
Soldering Method
Generally, as the most common mass soldering method for the solder attachment, wave soldering is used for through-
hole power modules and reflow soldering is used for surface-mount ones. Delta recommended soldering methods and
process parameters are provided in this document for solder attachment of power modules onto system board.
SAC305 is the suggested lead-free solder alloy for all soldering methods.

Reflow soldering is not a suggested method for through-hole power modules due to many process and reliability
concerns. If you have this kind of application requirement, please contact Delta sales or FAE for further confirmation.

Wave Soldering (Lead-free)

Delta’s power modules are designed to be compatible with single-wave or dual wave soldering. The suggested
soldering process must keep the power module’s internal temperature below the critical temperature of 217 ℃
continuously. The recommended wave-soldering profile is shown in following figure.

Recommended Temperature Profile for Lead-free Wave Soldering

Note: The temperature is measured on solder joint of pins of power module.

The typical recommended (for double-side circuit board) preheat temperature is 115+/-10 ℃ on the top side
(component side) of the circuit board. The circuit-board bottom-side preheat temperature is typically recommended to
be greater than 135℃ and preferably within 100℃ of the solder-wave temperature. A maximum recommended
preheat up rate is 3℃/s. A maximum recommended solder pot temperature is 255+/-5℃ with solder-wave dwell time
of 3~6 seconds. The cooling down rate is typically recommended to be 6℃/s maximum.

Hand Soldering (Lead Free)

Hand soldering is the least preferred method because the amount of solder applied, the time the soldering iron is held
on the joint, the temperature of the iron, and the temperature of the solder joint are variable. The recommended hand
soldering guideline is listed in following table. The suggested soldering process must keep the power module’s internal
temperature below the critical temperature of 217℃ continuously.

Hand-Soldering Guideline

Datasheet E-mail: dcdc@deltaww.com

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 CONTACT US
Reflow Soldering (Lead-free)
High temperature and long soldering time will result in IMC layer increasing in thickness and thereby shorten the
solder joint lifetime. Therefore the peak temperature over 245℃ is not suggested due to the potential reliability
risk of components under continuous high-temperature. In the meanwhile, the soldering time of temperature
above 217℃ should be less than 90 seconds. Please refer to below figure for recommended temperature profile
parameters.

Shielding cap is requested to mount on DCDC module if with heat-spreader/heat-sink, to prevent the customer
side high temperature of reflow to re-melt the DCDC module’s internal component’s soldering joint.

Temp.
Peak Temp. 240 ~ 245 ℃

217℃ Ramp down

max. 4℃/sec.
200℃

150℃ Preheat time

100~140 sec. Time Limited 90 sec.
above 217℃
Ramp up
max. 3℃/sec.
25℃
Time
Recommended Temperature Profile for Lead-free Reflow Soldering
Note: The temperature is measured on solder joint of pins of power module.

CONTACT US:
Website: www.deltaww.com/dcdc Email: dcdc@deltaww.com
USA: Europe: Asia & the rest of world:
Telephone: Telephone: +31-20-655-0967 Telephone: +886 3 4526107
East Coast: 978-656-3993 Fax: +31-20-655-0999 Ext. 6220~6226
West Coast: 510-668-5100 Fax: +886 3 4513485
Fax: (978) 656 3964

WARRANTY
Delta offers a two (2) year limited warranty. Complete warranty information is listed on our web site or is available upon request
from Delta.

Information furnished by Delta is believed to be accurate and reliable. However, no responsibility is assumed by Delta for its use,
nor for any infringements of patents or other rights of third parties, which may result from its use. No license is granted by implication
or otherwise under any patent or patent rights of Delta. Delta reserves the right to revise these specifications

Datasheet E-mail: dcdc@deltaww.com

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