MAP3201 – High current switch mode PWM LED Driver

MAP3201
High current switch mode PWM LED Driver

General Description Features

The MAP3201 is a high efficiency current mode PWM driver. It is
PWM Interface LED Driver
designed for LED driver that is used as the light source of LCD
Current Mode Control Type
panel. The controller can achieve efficiency higher than 90% for
Auto Restart Mode Protection
buck and boost applications.
Output Over Voltage Protection

Programmable LED Short Current Protection
The MAP3201 for accurate LED dimming control use external
Power Supply VCC=12V (Max 20V)
PWMI signal and set internal frequency by external resistor
Programmable LED Current Set (FBP)
which is programmable.
Programmable Boost switch current limit

Synchronization to peer-to-peer or external clock
The MAP3201 has a stable operation with wide input voltage
Fully RoHS Compliant
because it can be operated as separated VCC with input voltage
It has a auto-restart recovery protection if the system occur fault
signal. it can provide a good safety features.

Multiple MAP3201 have synchronized to each others or to other

external clock which is generated by Sync Pin.

The MAP3201 provide a 0.4A source current and 0.8A Sink

current gate driver. This can be suitable for high power
application. Using BCD process, the MAP3201 has a good Application
immunity at switching noise.
RGB and White LED Backlighting applications
The MAP3201’ application can be so easy to making lowest cost General LED lighting applications
system.

The MAP3201 is available in 16-Lead SOIC package and it is

offered in Halogen-free (fully RoHS compliant).
For more information, please contact local MagnaChip sales
office in world-wide or visit MagnaChip’s website at
www.magnachip.com.

Typical Application Circuit

Jan. 2009. Version 1.0 MagnaChip Semiconductor Ltd.

 MAP3201 – High current switch mode PWM LED Driver
Ordering Information
Junction
Part Number Part Marking Package RoHS Status
Temperature Range

MAP3201SIH SELC2010M -40℃ to +125℃ 16 Leads SOIC Halogen Free

Absolute Maximum Ratings

PARAMETER VALUE UNIT
VCC -0.3 ~ 20 V
GATE, PWMO -0.3 ~ 20 V
AUTO,CS, ISET,RT,SYNC,CLIM,REF,OVP,PWMI,COMP,FBP,FBN -0.3 ~ 5 V
Operating Junction Temperature Range -40 ~ 125 ℃
Storage Temperature Range -65 ~ 150 ℃
Lead temperature(soldering, 10sec ) 260 ℃
Thermal Resistance (θJA) 105 ℃/W

Jan. 2009. Version 1.0 MagnaChip Semiconductor Ltd.

 MAP3201 – High current switch mode PWM LED Driver
Electrical Characteristics
VCC=12V, VPWMI=5V, CGATE=CPWMO=1nF, Ta=25℃, unless otherwise specified
SYMBOL PARAMETER TEST CONDITION MIN TYP MAX UNIT

SUPPLY

VCC,OP Input voltage range Ta=-40℃ ~ 85℃ 8.5 18 V

IQ Operation quiescent current PWMI =0V - 1.2 2 mA

VUVLO_R Under-voltage lockout threshold VCC rising 7.5 8 8.5 V

VUVLO_F Under-voltage lockout hysteresis VCC falling - 1 - V

REFERENCE

Ta=-40℃ ~ 85℃ 4.90 5.00 5.10 V

VREF Reference pin voltage
Ta=25℃ 4.95 5.00 5.05 V

IREF=0uA, VPWMI=0V,
VREFLI Line regulation - - 0.02 %/V
CREF=0.1uF
IREF=0~500uA, VREF=0V,
VREFLO Load regulation - - 1 %/mA
CREF=0.1uF

GATE

ISOUR Gate short circuit current VGATE=0, VCC =12V 0.4 - - A

ISINK Gate sink current VGATE=12V, VCC =12V 0.8 - - A

TRISE GATE output rise time CGATE=1nF, VCC=12V - 50 85 ns

TFALL GATE output fall time CGATE=1nF, VCC =12V - 25 45 ns

Current Sense

TBLANK Leading Edge Blanking 100 - 375 ns

VCOMP=5V, VCLIM=5V,
TDELAY1 Delay to output of CS comparator(2) - 180 ns
VCS=0V to 600mV step
VCOMP =5V, CLIM=300mV,
TDELAY2 Delay to output of CLIMT comparator(2) - - 180 ns
VCS=0V to 400mV step

Internal Transconductance Opamp

AV Open loop DC Gain(2) - - 50 - dB

VCM Input common-mode range -0.3 - 3 V

VO Output Voltage range VCC=12V 0.6 - 2.75 V

gm Transconductance(2) 400 670 1000 uA/V

VOFFSET Input offset voltage -5 - 5 mV

IBIAS Input Bias current - 0.5 1 nA

Jan. 2009. Version 1.0 MagnaChip Semiconductor Ltd.

 MAP3201 – High current switch mode PWM LED Driver
Electrical Characteristics (Continued)
VCC=12V, VPWMI=5V, CGATE=CPWMO=1nF, Ta=25℃, unless otherwise specified
SYMBOL PARAMETER TEST CONDITION MIN TYP MAX UNIT

Oscillator

Ta=25℃, RT=500㏀ 95 100 105 kHz

Oscillator frequency
FOSC Ta=-40℃ ~ 85℃, RT=500㏀ 90 100 110 kHz
( 100KHz ~ 400KHz )

Ta=-40℃ ~ 85℃, RT=110㏀ 340 400 460 kHz

DMAX Maximum duty cycle - 90 - %

Synchronizing ( External Input )

VIL_SYNC SYNC Input voltage Low level - - 0.8 V

VIH_SYNC SYNC Input voltage high level - 2.0 - - V

TSYNC_MIN SYNC minimum input pulse width VSYNC = 0V to 5V 20 - - ns

0.05
TSYNC_MAX SYNC maximum input pulse width VSYNC = 0V to 5V - - ns
/FOSC

PWM Input

VPWMI(LO) PWMI input Low voltage - - - 0.8 V

VPWMI(HI) PWMI input High voltage - 2.0 - V

RPWMI PWMI pull-down resistance VPWMI=5V 50 100 150 ㏀

PWM Output

TRISE,PWMO PWM Output rise time 1nF capacitance at PWMO - - 300 ns

TFALL,PWMO PWM Output fall time 1nF capacitance at PWMO - 200 ns

Auto Restart Protection ( AUTO )

ISO,AUTO Current source at AUTO Pin - 3 5 8 uA

VTH(H) High threshold at AUTO Pin - 2.7 3 3.3 V

VTH(L) Low threshold at AUTO Pin - 0.9 1 1.1 V

Over Voltage Protection ( OVP )

VOVP Over voltage protection 2.94 3.0 3.06 V

VOVPH Over voltage protection hysteresis - - 0.3 - V

TOVP OVP Filtering time(2) - 200 - ns

Jan. 2009. Version 1.0 MagnaChip Semiconductor Ltd.

 MAP3201 – High current switch mode PWM LED Driver
Electrical Characteristics (Continued)
VCC=12V, VPWMI=5V, CGATE=CPWMO=1nF, Ta=25℃, unless otherwise specified
Programmable Short current protection ( ISET )

Input common-mode range of

VCM,ISET - -0.3 - 3 V
comparator

VOFF,ISET Input offset voltage of comparator VISET=1V -20 - 20 mV

VISET=1V,
Propagation time for short current
TOFF VFBN=0.9 to 1.1V step - - 250 ns
detection (2)
VPWMO goes from high to low

Note 1: Stress beyond the maximum ratings listed above may incur permanent damage to the device. Operating above the recommended
conditions for extended time may stress the device and affect device reliability. Also the device may not operate normally above the
recommended operating conditions. These are stress ratings only.
Note 2: These parameters, although guaranteed by design, are not tested in mass productioin.

Jan. 2009. Version 1.0 MagnaChip Semiconductor Ltd.

 MAP3201 – High current switch mode PWM LED Driver
Pin Description
PIN NO Description

1 VCC Power Supply Input

2 ISET Programmable Short Current Protection Set
3 GATE Gate drive Output for Boost Convert
4 GND GND
5 CS Current sense of the Boost Convert
6 AUTO Auto Restart mode control for protection
7 RT Oscillator frequency set of the Boost Converter
8 SYNC Oscillators to lock to the highest frequency
9 CLIM Programmable Boost Input current limit
10 REF Reference voltage
11 PWMO PWM Gate Driver Output
12 OVP Over voltage protection
13 PWMI PWM Gate Driver Input
14 COMP Error Amp. Compensation
15 FBP Error Amp. Non-inverting Input/Positive Current Sense
16 FBN Error Amp. Inverting Input/Negative Current Sense

Functional Block Diagram

REF RT SYNC
VCC 10 7 8
1

REF
+ Vcc Good
- CK -
+
8V/7V
VCC
BG 5V Internal Supply

Vcc Good
CS
S Q
5 LEB +
9 - R QB 3 GATE
CLIM -

+ Vcc Good
-
Gm AMP Control 11 PWMO
FBN 16 - 4R
Logic
FBP 15 + REF
LPF 1V/3V
R 3V/2.7V -
- IAUTO
+
COMP 14
+

2 12 6 13 4
ISET OVP AUTO PWMI GND

Jan. 2009. Version 1.0 MagnaChip Semiconductor Ltd.

 MAP3201 – High current switch mode PWM LED Driver
Physical Dimensions
No REVISION ITEM DATE NAME

Symbol Min Nom Max

A - - 1.80
Index Area
( D/2 x E1/2 ) A1 0.05 - 0.25
A2 1.25 - -
b 0.31 - 0.51
b1 0.28 - 0.48
C 0.10 - 0.30
c1 0.10 - 0.23
D 9.70 - 10.10
E 5.70 - 6.30
E1 3.75 - 4.15
e 1.14 1.27 1.40
L 0.40 - 1.27
L1 1.04 REF
L2 0.25 BSC
R 0.07 - -
R1 0.07 - -
θ 0° - 8°
θ1 0° - 15°

DIV’D NAME DATE TITLE 16 SOP

PACKAGE DRAWING

DES.BY Karl Lee ’09.11.19 DWG.NO MBKD-D0786

CH.BY

APR.BY REV.NO 0 SHEET 1/1

Reference JEDEC No. MS-012 (AC) SCALE NA UNIT mm

Jan. 2009. Version 1.0 MagnaChip Semiconductor Ltd.

 MAP3201 – High current switch mode PWM LED Driver
Typical Operating Characteristics
The following conditions apply: VCC =12V, RRT = 500 kΩ, VPWMI = 5V

Quiescent Current vs. VCC Quiescent Current vs. TEMP.

VREF vs. TEMP. VREF Load Regulation Voltage

VREF Line Regulation Voltage Under Voltage Lock Out

Jan. 2009. Version 1.0 MagnaChip Semiconductor Ltd.

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MAP3201 – High current switch mode PWM LED Driver

Typical Operating Characteristics
The following conditions apply: VCC =12V, RRT = 500 kΩ, VPWMI = 5V

Over Voltage Protection Frequency vs. RT

OCT.15 2009. Version 0.3 MagnaChip Semiconductor Ltd.

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MAP3201 – High current switch mode PWM LED Driver

When synchronizing multiple MAP3201 on single board, all SYNC
Current Mode Boost switching regulator Pin ICs of each device should be short to make all devices in sync
operation on the Oscillator clock of the fastest device.
In this case, the number of synchronized devices differs depending
The MAP 3201 is operated in current mode PWM Boost regulation on the operation frequency of Oscillator.
method, which shows fast frequency response while maintaining
stable output voltage. If this function of peer to peer synchronization is not used, the SYNC
pin may be required to be open or short to GND. It is recommended
It features stable response by using the recommended combination to connect SYNV Pin to GND because this solution provides better
of resistor and capacitor at COMP and GND pin for specific immunity against parasitic noise from layout.
condition of wide input voltage, Output voltage and variable Load
condition.

Internal 5V Low Dropout Regulator

The MAP3201 has LDO embedded in it to supply Internal analog,
logic circuit and external REF Pin. This LDO operates at a voltage
level where Vcc is higher than the UVLO voltage. It provides
maximum 10mA of output current through regulator which has 2%
accuracy of performance.
To stabilize the voltage of REF Pin, it is recommended to use low Figure 2 Internal OSC & SYNC circuit
ESR capacitor which is as low as 1uF and connect it between REF
and GND Pin, and install it as close as to Pin.

300KHz/5%`
Boost Converter Switching Frequency
SYNC(4v/div)
The MAP3201 can set the switching frequency of Boost converter
by connecting external resistor between RT and GND Pin.
Recommended switching frequency is 100 KHz to 400 KHz. Boost Drain(100V/div)
See Figure 1 for switching frequency adjustment resistor (RT)
VO( AC 1V/div)

Iboost (0.5A/div)

Figure 3 Synchronization by external clock

(Fixed 100 KHz  300 KHz)

GATE1

CH1 Boost Drain

GATE2

Figure 1 Boost switching frequency vs. RT

CH2 Boost Drain
GATE3
SYNCHRONIZATION
The MAP3201 can not only operate constant frequency internally,
but also control switching frequency externally by using external Figure 4 Peer –to -peer synchronization
master clock signal through SYNC Pin. The clock signal of SYNC (Fixed 100 KHz)
Pin needs to be faster than internal Oscillator clock to ensure
normal switching operation.

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MAP3201 – High current switch mode PWM LED Driver

4. Over Voltage Protection (OVP)
PROTECTION The MAP3201 offers over voltage protection in order to protect
MOSFET of boost converter and external component connected to
The MAP3201 offers the features such as UVLO, Boost current limit, Output pin when output voltage is in abnormal condition.
Over Voltage Protection and Short Circuit Protection of LED (SCP).
OVP and SCP are operated in auto restart protection mode. OVP Circuit monitors whether output voltage is stable level or not
If OVP Pin voltage reaches threshold condition (typical 3V), it can
shut off the switching of GATE and PWMO and then output voltage
1. Under-Voltage Lock-Out (UVLO) is falling as much as the leakage current time. If the voltage of OVP
When VCC voltage reaches over 8V, UVLO starts operating which Pin reaches OVP falling threshold (typical 2.7V), IC releases
enables Internal 5V Regulator, making all internal control circuits protection mode. In this time, protection releasing can be decided
including oscillator, gate driver and protection circuit ready for as value of capacitor with the longer discharge between auto restart
operation and output pin of GATE, PWMO and COMP starts time and the time of leakage current connected to output.
operating depending on the input status of PWMI.
The over voltage protection can be decided in the following
If VCC voltage drops below 7V during normal operation, UVLO equation.
starts operating, shutting down Internal Control Circuit and stopping
operation of GATE, PWMO and COMP. It is followed by disabling of - Protection voltage:
internal 5V regulator, and shut off of all IC operation. RO 2
VO = 3.0 *
RO1 + RO 2

2. Pulse by Pulse Current Limit

It will operate Pulse by Pulse current limit as voltage ratio between
COMP Pin Voltage which is controlled by Gm Amp of Boost
converter and CS Pin voltage which will be caused by external
Boost FET. - Protection release voltage:
RO 2
VO = 2.7 *
3. Maximum Current Limit RO1 + RO 2
Maximum current that is driven into Boost FET through CLIM Pin
voltage can be set up as in Figure 5

Figure 6 Over voltage protection circuit

The MAP3201 included LPF(low pass filter) of typical 200nS in OVP

circuit for better noise immunity, It may need a high noise margin
when Ro1 and Ro2 use high resistance value in order to minimize
Power loss.
Figure 5 Current Sense and Maximum current limit In this case, it is recommended to add Capacitor.

VC, MAX: Maximum output voltage of Gm Amp 5. Programmable Short Current Protection of LED
VOFF: Offset voltage of PWM comparator
(SCP)
The MAP3201 offers protection circuit to prevent short current when
VC ,MAX − 0.6V LED string is shorted
VCS = − VOFF
5 In Figure 7 when LED string is shorted, the voltage of FBN Pin can
be calculated in the following equation
VCS = VCLIM
VFBN = I LED ∗ RLED
The equation above can be used to set up Maximum boost current
when VCLIM is VCS.

OCT.15 2009. Version 0.3 MagnaChip Semiconductor Ltd.

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MAP3201 – High current switch mode PWM LED Driver

The programmable SCP voltage can be set up in reference to 5V The timer circuit operates as the configuration of both comparator of
VREF in the equation below. 1V/3V Input, IAUTO=5uA (typical) and external capacitor CAUTO and
the restart time can be calculated in the following equation.
5 * R2
VISET =
R1 + R 2 2 * C AUTO
TAR = = 4e + 5 * C AUTO
Therefore, the SCP level can be decided by selecting the resistor I AUTO
value of RLED, R1 and R2.

Figure 9 Auto Restart Protection timing diagram

Figure 7 Programmable short current protections On Auto-Restart Protection status, it makes restart signal of internal
single pulse when the voltage of AUTO Pin is high threshold. In this
SCP Circuit uses very fast comparator in order to turn off MOSFET case, it is recovered to normal operating mode if SCP or OVP
when the abnormal condition of SCP Level is detected. Because condition is cleared. While charging AUTO pin, it recover protection
high current can be driven into channel of MOSFET when LED when next restart signal occurs even though protection condition is
string is shorted. cleared.
It is recommended to use additional ISET Cs capacitor in order to
prevent abnormal SCP which is caused by noise

6. Auto-Restart Protection
The MAP3201 offers Auto Restart protection function which is
recovered into normal operation mode when protection condition is Dimming Control
cleared
1. LED Current
The MAP3201 decides LED Current setting by the value of RLED
resistance which has been sensing the voltage of positive input FBP
Pin of gm Amp. and LED current (VFBP)

Figure 8 Auto Restart Protection circuit

Figure 8 shows auto restart protection circuit that shuts off the
output of GATE switching and PWMO if protection signal is
assigned to control logic circuit under OVP or SCP condition.

Figure 10 LED Current Setting

OCT.15 2009. Version 0.3 MagnaChip Semiconductor Ltd.

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MAP3201 – High current switch mode PWM LED Driver

In figure 10 Closed Loop Network Selection
V * R2
VFBP = REF The MAP3201 controls in peak current mode. Current mode easily
R1+ R 2 achieves compensation by consisting simple single Pole from
Double Pole that LC filer makes at Voltage mode
VFBN = I LED * RLED
Vout

5 * R2
∴ I LED = Vc ~
~ iL
( R1 + R 2) * RLED Co Ro

2. PWM Dimming
The MAP3201 makes same phase PWMO output from logic PWM Vc -
signal of PWMI using intenral Level shift. PWMO of operating
voltage level is between GND and VCC. ++
Rc Vref
(Optional)
Cc
Inductor Selection
Inductor value should be decided before system design. Figure 11 Current mode Loop Compensation
Because the selection of the inductor affects the operating
mode of CCM (Continuous current mode) or DCM (Discontinuous
current mode). 1. Select fC (Crossover frequency)
In CCM operation, indutor size should be bigger, even though the In general, crossover frequency is selected from 1/3 ~ 1/6 range of
ripple current and peak current of inductor can be small. the switching frequency. If fc is large, there is possibility of oscillation
In DCM operation, even ripple current and peak current of inductor to occur, although time response gets better.
should be large while the inductor size can be smaller so that it is On the other hand, if fc is small, time response will be bad, while it
more effective in BLU of TV and Notebook application. has improved stability, which may cause over shoot or under shoot
in abnormal condition.
The MAP3201 was designed for DCM operation. It should be noted that fc should be set at smaller location than RHP
In CCM operation, sub-harmonic oscillation may occur if duty cycle Zero.
exceeds over 50%. Because there is no slope compensation
functions. Ro * (1 − D) 2
f RHP = (Boost)
2π * L
The following is the equation to calculate Max.Value of Inductor in
DCM operation.
2. Select fPO
2
[(1 − D) * D * RO (max) * Ts (min) ]
L(max) = f PO = f C * GO
2
A
( GO = DC Gain of plant = )
* RO (max) = Maximum _ Output _ Im pedance B
* TS (min ) = Minimum _ Switching _ period
1
A=
2 (m − 0.5) * (1 − D) 3
+
R L*F
Selecting approximately m = 1.4

B = RS * (1 − D)
RS = Sensing Resistor

OCT.15 2009. Version 0.3 MagnaChip Semiconductor Ltd.

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MAP3201 – High current switch mode PWM LED Driver

3. Select Pole and Zero

1
f PO =
CC
2π *
Y * G EA
G EA = Gm-Amp Transconductance
VFPN
Y = Attenuation − Ratio =
VO
1
f Z1 =
2π * RC * C C

Zero is set at the same location of output pole. In system design, if

ESR of output capacitor is large, Pole should be set at same
frequency in order to compensate The Zero of ESR.

1
f P1(OP ) =
2π * RC * C OP

OCT.15 2009. Version 0.3 MagnaChip Semiconductor Ltd.

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MAP3201 – High current switch mode PWM LED Driver

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OCT.15 2009. Version 0.3 MagnaChip Semiconductor Ltd.