FEATURES

Š High efficiency 94.5% @12V/33A

Š Size:

57.9x36.8x11.2mm (2.28”x1.45”x0.44”)
(w/o heat spreader)

57.9x36.8x12.7mm (2.28”x1.45”x0.50”)

(with heat spreader)

Š Standard footprint
Š Industry standard pin out
Š Fixed frequency operation
Š Input UVLO, Output OCP, OVP, OTP
Š 2250V isolation and basic insulation
Š No minimum load required
Š ISO 9001, TL 9000, ISO 14001, QS9000,
OHSAS18001 certified manufacturing facility
Š UL/cUL 60950-1 (US & Canada) Recognized,
and TUV (EN60950-1) Certified
Š CE mark meets 73/23/EEC and 93/68/EEC
directives

Delphi Series Q48SH, 400W Quarter Brick Family

DC/DC Power Modules: 48V in, 12V/33A out

OPTIONS
The Delphi series Q48SH, quarter Brick, 48V input, single output,
Š Latched over current protection
Isolated DC/DC converter is the latest offering from a world leader in
Š Positive On/Off logic
power system and technology and manufacturing ― Delta Electronics, Š Heat spreader available for
Inc. This product family provides up to 400 watts of power in an industry extended operation.
Š Latched over voltage protection
standard footprint and pinout. With creative design technology and
optimization of component placement, these converters possess
outstanding electrical and thermal performances, as well as extremely
high reliability under highly stressful operating conditions. All models
are fully protected from abnormal input/output voltage, current, and APPLICATIONS
temperature conditions. The Delphi Series converters meet all safety Š Telecom / Datacom
Š Wireless Networks
requirements with basic insulation.
Š Optical Network Equipment
Š Server and Data Storage
Š Industrial / Testing Equipment

DATASHEET
DS_Q48SH12033_06102009
 TECHNICAL SPECIFICATIONS
(TA=25°C, airflow rate=300 LFM, Vin=48Vdc, nominal Vout unless otherwise noted;
PARAMETER NOTES and CONDITIONS Q48SH12033 (Standard)
Min. Typ. Max. Units
ABSOLUTE MAXIMUM RATINGS
Input Voltage
Continuous 80 Vdc
Transient 100ms 100 Vdc
Operating Case Temperature (Without heat spreader) Please refer to Fig.18 -40 121 °C
Operating Case Temperature (With heat spreader) Please refer to Fig.20 -40 103 °C
Storage Temperature -55 125 °C
Input/Output Isolation Voltage 2250 Vdc
INPUT CHARACTERISTICS
Operating Input Voltage 36 48 75 Vdc
Input Under-Voltage Lockout
Turn-On Voltage Threshold 31 34 36 Vdc
Turn-Off Voltage Threshold 29 31 33 Vdc
Lockout Hysteresis Voltage 3 Vdc
Maximum Input Current 100% Load, 36Vin 15 A
No-Load Input Current 110 200 mA
Off Converter Input Current 10 20 mA
Inrush Current (I2t) 1 A2s
Input Reflected-Ripple Current P-P thru 12µH inductor, 5Hz to 20MHz 10 mA
Input Voltage Ripple Rejection 120 Hz TBD dB
OUTPUT CHARACTERISTICS
Output Voltage Set Point Vin=48V, Io=50%Io.max, Tc=25°C 11.76 12.00 12.24 Vdc
Output Voltage Regulation
Over Load Io=Io,min to Io,max ±300 ±600 mV
Over Line Vin=36V to 75V ±50 ±300 mV
Over Temperature Tc=-40°C to 100°C ±240 mV
Total Output Voltage Range over sample load, line and temperature 11.4 12.6 V
Output Voltage Ripple and Noise 5Hz to 20MHz bandwidth
Peak-to-Peak Full Load, 1µF ceramic, 10µF tantalum 100 200 mV
RMS Full Load, 1µF ceramic, 10µF tantalum 50 100 mV
Operating Output Current Range 0 33 A
Output DC Current-Limit Inception Output Voltage 10% Low 110 140 %
DYNAMIC CHARACTERISTICS
Output Voltage Current Transient 48V, 10µF Tan & 100µF Ceramic load cap, 0.1A/µs
Positive Step Change in Output Current 50% Io.max to 75% Io.max 300 mV
Negative Step Change in Output Current 75% Io.max to 50% Io.max 300 mV
Settling Time (within 1% Vout nominal) 100 µs
Turn-On Transient
Start-Up Time, From On/Off Control 200 300 ms
Start-Up Time, From Input 200 300 ms
Maximum Output Capacitance Full load; 5% overshoot of Vout at startup 10000 µF
EFFICIENCY
100% Load 94.5 %
60% Load 94.8 %
ISOLATION CHARACTERISTICS
Input to Output 2250 Vdc
Isolation Resistance 10 MΩ
Isolation Capacitance 1000 pF
FEATURE CHARACTERISTICS
Switching Frequency 140 kHz
ON/OFF Control, Negative Remote On/Off logic
Logic Low (Module On) Von/off at Ion/off=1.0mA 0 1.2 V
Logic High (Module Off) Von/off at Ion/off=0.0 µA 3 50 V
ON/OFF Control, Positive Remote On/Off logic
Logic Low (Module Off) Von/off at Ion/off=1.0mA 0 1.2 V
Logic High (Module On) Von/off at Ion/off=0.0 µA 3 50 V
ON/OFF Current (for both remote on/off logic) Ion/off at Von/off=0.0V 1 mA
Leakage Current (for both remote on/off logic) Logic High, Von/off=15V 50 uA
Output Over-Voltage Protection Over full temp range; % of nominal Vout 115 140 %
GENERAL SPECIFICATIONS
MTBF Io=80% of Io, max; Tc=40°C 1.1 M hours
Weight 47 grams
Over-Temperature Shutdown ( Without heat spreader) Please refer to Fig. 18 126 °C
Operating Case Temperature (With heat spreader) Please refer to Fig. 20 108 °C

DS_Q48SH12033_06102009 2
 ELECTRICAL CHARACTERISTICS CURVES

96 26
95 24
94 22
93 20
92 18
EFFICIENCY(%).

LOSS(W)
91 16

90 14

89 36V 12

88 48V 10 36V
87 75V 8 48V
75V
86 6

85 4
5 7 9 11 13 15 17 19 21 23 25 27 29 31 33 5 7 9 11 13 15 17 19 21 23 25 27 29 31 33
OUTPUT CURRENT(A) OUTPUT CURRENT(A)

Figure 1: Efficiency vs. load current for minimum, nominal, and Figure 2: Power dissipation vs. load current for minimum,
maximum input voltage at 25°C. nominal, and maximum input voltage at 25°C.

13

12

11

10
INPUT CURRENT(A)

2
30 35 40 45 50 55 60 65 70 75
INPUT VOLTAGE(V)

Figure 3: Typical full load input characteristics at room

temperature.

DS_Q48SH12033_06102009 3
 ELECTRICAL CHARACTERISTICS CURVES
For Negative Remote On/Off Logic

Figure 4: Turn-on transient at zero load current) (50ms/div). Figure 5: Turn-on transient at full rated load current (50
Top Trace: Vout; 5V/div; Bottom Trace: ON/OFF input: 2V/div. ms/div). Top Trace: Vout: 5V/div; Bottom Trace: ON/OFF input:
2V/div.

For Input Voltage Start up

Figure 6: Turn-on transient at zero load current (50 ms/div). Figure 7: Turn-on transient at full rated load current (50
Top Trace: Vout; 5V/div; Bottom Trace: input voltage: 50V/div. ms/div). Top Trace: Vout; 5V/div; Bottom Trace: input voltage:
50V/div.

DS_Q48SH12033_06102009 4
 ELECTRICAL CHARACTERISTICS CURVES

Figure 8: Output voltage response to step-change in load Figure 9: Output voltage response to step-change in load
current (75%-50% of Io, max; di/dt = 0.1A/µs). Load cap: 10µF, current (50%-75% of Io, max; di/dt = 0.1A/µs). Load cap: 10µF,
tantalum capacitor and 100µF ceramic capacitor. Trace: Vout tantalum capacitor and 100µF ceramic capacitor. Trace: Vout
(200mV/div), Scope measurement should be made using a (200mV/div), Scope measurement should be made using a
BNC cable (length shorter than 20 inches). Position the load BNC cable (length shorter than 20 inches). Position the load
between 51mm to 76mm (2 inches to 3 inches) from the between 51mm to 76mm (2 inches to 3 inches) from the
module. module.

Figure 10: Test set-up diagram showing measurement points Figure 11: Input Terminal Ripple Current, ic, at full rated output
for Input Terminal Ripple Current and Input Reflected Ripple current and nominal input voltage with 12µH source impedance
Current. and 100µF electrolytic capacitor (1000 mA/div，2us/div).
Note: Measured input reflected-ripple current with a simulated
source Inductance (LTEST) of 12 μH. Capacitor Cs offset
possible battery impedance. Measure current as shown above.

DS_Q48SH12033_06102009 5
 ELECTRICAL CHARACTERISTICS CURVES

Figure 12: Input reflected ripple current, is, through a 12µH Figure 13: Output voltage noise and ripple measurement test
source inductor at nominal input voltage and rated load current setup.
(20 mA/div，2us/div).

13

12

11

10
OUTPUT VOLTAGE(V)

2
3 6 9 12 15 18 21 24 27 30 33 36 39 42
OUTPUT CURRENT(A)

Figure 14: Output voltage ripple at nominal input voltage and Figure 15: Output voltage vs. load current showing typical
rated load current (Io=33A)(50 mV/div, 2us/div) current limit curves and converter shutdown points.
Load capacitance: 1µF ceramic capacitor and 10µF tantalum
capacitor. Bandwidth: 20 MHz. Scope measurements should be
made using a BNC cable (length shorter than 20 inches).
Position the load between 51mm to 76mm (2 inches to 3
inches) from the module.

DS_Q48SH12033_06102009 6
 DESIGN CONSIDERATIONS
Input Source Impedance
Š The input source must be insulated from the ac
The impedance of the input source connecting to the mains by reinforced or double insulation.
DC/DC power modules will interact with the modules
and affect the stability. A low ac-impedance input source Š The input terminals of the module are not operator
is recommended. If the source inductance is more than accessible.
a few μH, we advise adding a 10μF to 100μF electrolytic
capacitor (ESR < 0.7 Ω at 100 kHz) mounted close to Š If the metal baseplate is grounded, one Vi pin and
the input of the module to improve the stability. one Vo pin shall also be grounded.

Layout and EMC Considerations Š A SELV reliability test is conducted on the system
where the module is used, in combination with the
Delta’s DC/DC power modules are designed to operate module, to ensure that under a single fault,
in a wide variety of systems and applications. For design hazardous voltage does not appear at the module’s
assistance with EMC compliance and related PWB output.
layout issues, please contact Delta’s technical support
team. An external input filter module is available for When installed into a Class II equipment (without
easier EMC compliance design. Application notes to grounding), spacing consideration should be given to
assist designers in addressing these issues are pending the end-use installation, as the spacing between the
release. module and mounting surface have not been evaluated.

Safety Considerations The power module has extra-low voltage (ELV) outputs
when all inputs are ELV.
The power module must be installed in compliance with
the spacing and separation requirements of the This power module is not internally fused. To achieve
end-user’s safety agency standard, i.e., UL60950-1, optimum safety and system protection, an input line fuse
CAN/CSA-C22.2, No. 60950-1 and EN60950-1+A11 and is highly recommended. The safety agencies require a
IEC60950-1, if the system in which the power module is normal-blow fuse with 20A maximum rating to be
to be used must meet safety agency requirements. installed in the ungrounded lead. A lower rated fuse can
be used based on the maximum inrush transient energy
Basic insulation based on 75 Vdc input is provided and maximum input current.
between the input and output of the module for the
purpose of applying insulation requirements when the Soldering and Cleaning Considerations
input to this DC-to-DC converter is identified as TNV-2
or SELV. An additional evaluation is needed if the Post solder cleaning is usually the final board assembly
source is other than TNV-2 or SELV. process before the board or system undergoes electrical
testing. Inadequate cleaning and/or drying may lower the
When the input source is SELV circuit, the power module reliability of a power module and severely affect the
meets SELV (safety extra-low voltage) requirements. If finished circuit board assembly test. Adequate cleaning
the input source is a hazardous voltage which is greater and/or drying is especially important for un-encapsulated
than 60 Vdc and less than or equal to 75 Vdc, for the and/or open frame type power modules. For assistance
module’s output to meet SELV requirements, all of the on appropriate soldering and cleaning procedures,
following must be met: please contact Delta’s technical support team.

DS_Q48SH12033_06102009 7
 FEATURES DESCRIPTIONS
Over-Current Protection

The modules include an internal output over-current

protection circuit, which will endure current limiting for
an unlimited duration during output overload. If the
output current exceeds the OCP set point, the modules
will automatically shut down (hiccup mode).

The modules will try to restart after shutdown. If the

overload condition still exists, the module will shut down Figure 16: Remote on/off implementation
again. This restart trial will continue until the overload
condition is corrected.

Over-Voltage Protection

The modules include an internal output over-voltage

protection circuit, which monitors the voltage on the
output terminals. If this voltage exceeds the
over-voltage set point, the modules will automatically
shut down (hiccup mode).

The modules will try to restart after shutdown. If the

overvoltage condition still exists, the module will shut
down again. This restart trial will continue until the
overvoltage condition is corrected.

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.

Remote On/Off

The remote on/off feature on the module can be either

negative or positive logic. Negative logic turns the
module on during a logic low and off during a logic high.
Positive logic turns the modules on during a logic high
and off during a logic low.

Remote on/off can be controlled by an external switch

between the on/off terminal and the Vi (-) 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 Vi (-). For positive
logic if the remote on/off feature is not used, please
leave the on/off pin to floating.

DS_Q48SH12033_06102009 8
 THERMAL CONSIDERATIONS
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.

Thermal Testing Setup

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 test PWB and is vertically positioned within the
wind tunnel. The space between the neighboring PWB
and the top of the power module is constantly kept at
6.35mm (0.25’’).

FACING PWB PWB

MODULE

AIR VELOCITY
AND AMBIENT
TEMPERATURE
MEASURED BELOW
THE MODULE 50.8 (2.0”)

AIR FLOW

12.7 (0.5”)

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

Figure 17: 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.

DS_Q48SH12033_06102009 9
THERMAL CURVES THERMAL CURVES
(WITHOUT HEAT SPREADER) (WITH HEAT SPREADER)

Figure 18: Temperature measurement location Figure 20: Temperature measurement location
* The allowed maximum hot spot temperature is defined at 121℃ * The allowed maximum hot spot temperature is defined at 103℃
Q4 8SH 12033(Sta ndard) Outpu t Current vs. Amb ient Temperatu re and Air Ve locity
Output Current (A ) @Vin = 48V (Tran sverse Orie ntation ) Q48SH12033(Standard) Output Current vs. Ambient Temperature and Air Velocity
Output Current(A) @Vin = 48V (Transverse Orientation,With Heatspreader)
33
33
600LFM 600LFM
30
30
5 00LFM 500LFM
27 27

24 24

21 21
Natural
18 18 Convection
Natural
15 Convectio n 15 100LFM

100L FM 12 200LFM
12
200LFM
9 300LFM
9
300LFM 6
6
400LFM
3
3 4 00LFM
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 19: Output current vs. ambient temperature and air Figure 21: Output current vs. ambient temperature and air
velocity @Vin=48V(Transverse Orientation, without heat velocity @Vin=48V(Transverse Orientation, with heat spreader)
spreader)

DS_Q48SH12033_06102009 10
MECHANICAL DRAWING (WITHOUT HEAT SPREADER)

Pin No. Name Function

1 +Vin Positive input voltage
2 ON/OFF Remote ON/OFF
3 Case Optional
4 -Vin Negative input voltage
5 -Vout Negative output voltage
6 +Vout Positive output voltage

Pin Specification:
Pins 1-4 1.00mm (0.040”) diameter
Pins 5 &6 1.50mm (0.059”) diameter
All pins are copper with Tin plating.

DS_Q48SH12033_06102009 11
 MECHANICAL DRAWING (WITH HEAT SPREADER)
* For modules with through-hole pins and the optional heatspreader, they are intended for wave soldering assembly
onto system boards; please do not subject such modules through reflow temperature profile.

DS_Q48SH12033_06102009 12
 PART NUMBERING SYSTEM
Q 48 S H 120 33 N R F A
Type of Input Number Product Output Output ON/OFF Pin Option Code
Product Voltage of Series Voltage Current Logic Length
Outputs
Q- Quarter 48- 36~75V S- Single H- High 120 - 12V 33 - 33A N - Negative R - 0.170” F- RoHS 6/6 A- Standard, no Case Pin
Brick Power N - 0.145” (Lead Free) H- With Heat spreader and Case Pin
Space - N- With Heat spreader, no Case Pin
RoHS 5/6

MODEL LIST
MODEL NAME INPUT OUTPUT EFF @ 100% LOAD
Q48SH12033NRFA 36V~75V 15A 12V 33A 94.5%
Q48SH12033NN H 36V~75V 15A 12V 33A 94.5%

Default remote on/off logic is negative and pin length is 0.170”

For different remote on/off logic and pin length, please refer to part numbering system above or contact your local sales

* For modules with through-hole pins and the optional heatspreader, they are intended for wave soldering assembly
onto system boards; please do not subject such modules through reflow temperature profile.

CONTACT: www.delta.com.tw/dcdc
USA: Europe: Asia & the rest of world:
Telephone: Phone: +41 31 998 53 11 Telephone: +886 3 4526107
East Coast: (888) 335 8201 Fax: +41 31 998 53 53 ext 6220~6224
West Coast: (888) 335 8208 Email: DCDC@delta-es.com Fax: +886 3 4513485
Fax: (978) 656 3964 Email: DCDC@delta.com.tw
Email: DCDC@delta-corp.com

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
at any time, without notice.

DS_Q48SH12033_06102009 13