Datasheet
LED Drivers for LCD Backlights
White LED Driver for large LCD
Panels (DCDC Converter type)
BD93941EFV BD93941FP
General Description
BD93941EFV and BD93941FP is a high efficiency driver
for white LEDs and designed for large LCDs. These ICs
are built-in a boost DCDC converters that employ an
array of LEDs as the light source. BD93941EFV and
BD93941FP have some protect function against fault
conditions, such as the over-voltage protection (OVP),
the over current limit protection of DCDC (OCP), the
short circuit protection (SCP), the open detection of LED
string. Therefore BD93941EFV and BD93941FP are
available for the fail-safe design over a wide range
output voltage.
Key Specification
Operating power supply voltage range: 9.0V to 35.0V
LED minimum current
30mA
LED maximum current:
200mA
Oscillator frequency:
150kHz (RT=100kΩ)
Operating Current:
4.5mA (Typ.)
Operating temperature range:
-40°C to +85°C
Applications
TV, Computer Display, Notebook, LCD Backlighting
Package
HTSSOP-B20
HSOP20
W(Typ.) x D(Typ.) x H(Max.)
6.50mm x 6.40mm x 1.00mm
14.90mm x 7.80mm x 2.10mm
Features
4ch LED constant current driver and DC/DC converter
Maximum LED Current: 200mA
LED Feedback Voltage: 0.37V (@ADIM=2.5V)
so lower heat. Adjustable Feed Back Voltage
by following LED Current setting.
2%
LED current accuracy (ADIM=2.5V,
when each LED is set to 100mA)
Analog current (Linear) dimming at ADIM pin
LED pin rating 60V
Individual detection and individual LED OFF for both
open and short circuits
Built-in ISET pin short-circuit protection circuit
Set Soft-Start time by external capacitor.
FET’s Gate (N pin) is driven by 5.8V swing
Built-in Vout discharge circuit for shutdown
Built-in Vout overvoltage protection (OVP) /
reduced voltage protection (SCP) circuit
HTSSOP-B20 and HSOP20 package with high heat
radiation efficiency
Figure 1(a). HTSSOP-B20
(BD93941EFV)
Typical Application Circuit
VIN
VIN
Inductor
Diode
Figure 1(b). HSOP20
(BD93941FP)
CIN
COUT
REG58
CREG
EXPOSED
PAD
ON/OFF
RVCC
FET
RN2
REG58
RCS
DN RN1
STB
VCC
N
DCDC_GND
CS
CVCC
PGND
LED4
LED3
LED_GND
LED2
LED1
CLED2
CLED4
CLED3
RRT
AGND
ROVP1
ROVP2
COVP
RFB CFB1
RT
OVP
FB
CFB2
CSS
SS
ISET
AUTO
ADIM
PWM
AGND
CLED1
PWM
RISET
CAUTO
ADIM
Figure 2. Typical Application Circuit
○Product
structure：Silicon monolithic integrated circuit
.
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© 2013 ROHM Co., Ltd. All rights reserved.
TSZ22111・14・001
○This
product has not designed protection against radioactive rays
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TSZ02201-0F1F0C100270-1-2
12.Aug.2015 Rev.003
BD93941EFV BD93941FP
Absolute maximum ratings
(Ta=25°C)
Parameter
Power supply voltage
STB, ADIM, OVP, PWM terminal voltage
LED1 to 4 terminal voltage
AUTO, REG58, CS, N, ISET, SS, FB, RT terminal
voltage
Power dissipation (HTSSOP-B20)
(HSOP20)
Operating temperature range
Storage temperature range
Datasheet
Symbol
VCC
STB, ADIM, OVP, PWM
LED1 to 4
AUTO, REG58, CS, N,
ISET, SS, FB, RT
Pd1
Pd2
Topr
Tstg
Ratings
36
36
60
7
3.20 *1
2.18 *2
-40 to +85
-55 to +150
150
Unit
V
V
V
V
W
°C
°C
°C
Junction temperature
Tjmax
*1 Ta = 25°C or more, diminished at -25.6mW/°C in the case of HTSSOP-B20
(when 4-layer / 70.0 mm x 70.0 mm x 1.6 mm board is mounted)
*2 Ta = 25°C or more, diminished at -17.4mW/°C in the case of HSOP20
(when 4-layer / 70.0 mm x 70.0 mm x 1.6 mm board is mounted)
Operating Ratings
Parameter
VCC supply voltage
Min. output current of LED1 to 4
Max. output current of LED1 to 4
ADIM input voltage1 (use ADIM function)
ADIM input voltage1 (don’t use ADIM function)
DC/DC oscillation frequency
Symbol
VCC
ILED_MIN
ILED_MAX
VADIM1
VADIM2
Fsw
Limits
9.0 to 35.0
30
200
0.2 to 2.7 (normal op.)
1.0 to 2.7
(start up)
REG58 to 35.0
100 to 800
Unit
V
mA *1
mA
*1,2
V *3
V
kHz
Min. on-duty time for PWM light modulation
PWM_MIN
30
μs
*1 The amount of current per channel.
*2 If LED makes significant variations in its reference voltage, the driver will increase power dissipation, resulting in a rise
in package temperature.
To avoid this problem, design the board with thorough consideration given to heat radiation measures.
*3 To avoid unused LED pin’s misdetection, set ADIM within 1.0V to 2.7V at start up stage. After unused LED pin’s
detection, set ADIM within 0.2V to 2.7V in normal operation.
Pin Configuration
HTSSOP-B20
1
HSOP20
AUTO
REG58
CS
N
DCDC_GND
VCC
ADIM
RT
FB
SS
20
2
19
3
18
4
17
5
16
6
OVP
STB
LED1
LED2
LED_GND
ISET
PWM
LED4
LED3
N.C.
15
7
14
8
13
9
12
10
11
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© 2013 ROHM Co., Ltd. All rights reserved.
TSZ22111・15・001
Figure 3. Pin Configuration
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TSZ02201-0F1F0C100270-1-2
12.Aug.2015 Rev.003
BD93941EFV BD93941FP
Marking diagram and physical dimension
HTSSOP-B20
HSOP20
Datasheet
LOT No.
D93941
BD93941FP
LOT No.
Figure 4. Physical Dimension
Electrical Characteristics
(Unless otherwise noted, Ta = 25
o
C, VCC=24V)
Parameter
[Whole Device]
Circuit current while in operation
Circuit current while in standby
[REG58 Block]
REG58 Output Voltage
REG58 available current
[UVLO Block]
UVLO release voltage
UVLO hysteresis voltage
[DC/DC Block]
Error amp. Reference voltage
Oscillation frequency
Max. duty cycle per output of N pin
On resistance on N pin source side
On resistance on N pin sink side
SS pin source current
Soft start completion voltage
FB sink current
FB source current
Over current detection voltage
VLED
fsw
DMAX
RONH
RONL
ISSSO
VSS_END
IFBSINK
IFBSOURCE
VCS
0.35
142.5
83
-
-
-4
3.3
50
-150
0.40
0.37
150.0
90
4
3
-2
3.7
100
-100
0.45
0.39
157.5
97
8
6
-1
4.1
150
-50
0.50
V
kHz
%
Ω
Ω
uA
V
μA
μA
V
ISET=75kΩ, ADIM=2.5V
RT=100kΩ
RT=100kΩ
ION=-10mA
ION=10mA
SS=2V
SS=SWEEP UP
LED=2.0V, FB=1.0V
LED=0V, FB=1.0V
CS=SWEEP UP
VUVLO_VCC
VUHYS_VCC
6.5
150
7.5
300
8.5
600
V
mV
VCC=SWEEP UP
VCC=SWEEP DOWN
REG58
IREG58
5.742
15
5.8
-
5.858
-
V
mA
IO=0mA
ICC
ISTB
-
-
4.5
40
9
80
mA
μA
STB=3V,PWM=3V,
RT=100kΩ
STB=0V
Symbol
Limit
Min.
Typ.
Max.
Unit
Condition
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TSZ02201-0F1F0C100270-1-2
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BD93941EFV BD93941FP
Electrical Characteristics
(Unless otherwise noted, Ta = 25
o
C, VCC=24V)
Parameter
[DC/DC Protection Block]
Overvoltage protection detection
voltage
Overvoltage protection detection
hysteresis voltage
Short circuit protection detection
voltage
[LED Driver Block]
LED pin current accuracy 1
LED pin current accuracy 2
LED pin current accuracy 3
LED pin current accuracy 4
LED pin current accuracy 5
LED pin Leakage Current
LED open detection voltage
LED short detection voltage
ADIM pin Input Current
[STB Block]
STB pin high-level voltage
STB pin low-level voltage
STB pin pull-down resistance
[PWM Block]
PWM pin high-level voltage
PWM pin low-level voltage
PWM pin pull-down resistance
PWMH
PWML
RPWM
2
-0.3
180
-
-
300
35
0.8
420
V
V
kΩ
STBH
STBL
RSTB
2
-0.3
500
-
-
1000
35
0.8
1500
V
V
kΩ
dILED1
dILED2
dILED3
dILED4
dILED5
ILLED
VOPEN
VSHORT
ILADIM
-2
-3.2
-4.6
-8
-3
-2.5
0.05
4
-2.5
-
-
-
-
-
-
0.2
5
-
2
3.2
4.6
8
3
2.5
0.285
6
2.5
%
%
%
%
%
μA
V
V
μA
VOVP
VOVP_HYS
VSCP
2.7
50
0.04
3.00
100
0.10
3.3
200
0.25
V
mV
V
Symbol
Limit
Min.
Typ.
Max.
Unit
Datasheet
Condition
OVP=SWEEP UP
OVP=SWEEP DOWN
OVP=SWEEP DOWN
ILED=100mA,
(ADIM=2.5V,ISET=75kΩ)
ILED=70mA,
(ADIM=1.75V,ISET=75kΩ)
ILED=50mA,
(ADIM=1.25V,ISET=75kΩ)
ILED=30mA,
(ADIM=0.75V,ISET=75kΩ)
ILED=100mA,
(ADIM=7V,ISET=75kΩ)
LED=60V
LED=SWEEP DOWN
LED=SWEEP UP
ADIM=3V
STB=SWEEP UP
STB=SWEEP DOWN
STB=3.0V
PWM=SWEEP UP
PWM= SWEEP DOWN
PWM=3.0V
[Failure Indication Block (Open Drain)]
AUTO pin source current
AUTO pin Detection Voltage
Abnormal Detection Timer
IAUTO
VAUTO
tCP
-2
3.6
-1
4.0
20
-0.5
4.4
μA
V
ms
AUTO=2V
AUTO=SWEEP UP
RT=75kΩ
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TSZ02201-0F1F0C100270-1-2
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BD93941EFV BD93941FP
Pin Descriptions (BD93941EFV)
Pin No
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
Pin Name
AUTO
REG58
CS
N
DCDC_GND
OVP
STB
LED1
LED2
LED_GND
LED3
LED4
PWM
ISET
GND
SS
FB
RT
ADIM
VCC
In/Out
Out
Out
In
Out
-
In
In
Out
Out
-
Out
Out
In
Out
-
Out
In/Out
Out
In
In
Auto-restart time setting pin
Power supply for N pin
DC/DC output current detection and OCP detection pin
DC/DC switching output pin
Power GND pin
Overvoltage protection detection pin
Enable pin
Output pin 1 for LED
Output pin 2 for LED
Ground pin for LED
Output pin 3 for LED
Output pin 4 for LED
External PWM light modulation signal input pin for LED1-4
LED current setting resistor connection pin
Analog GND pin
Soft start pin / LED protection masking time setting pin.
Error amp output pin
DC/DC drive frequency setting resistor connection pin.
Analog dimming DC voltage input pin
Power supply pin
Function
Datasheet
Rating [V]
-0.3 to 7
-0.3 to 7
-0.3 to 7
-0.3 to 7
-
-0.3 to 36
-0.3 to 36
-0.3 to 60
-0.3 to 60
-
-0.3 to 60
-0.3 to 60
-0.3 to 36
-0.3 to 7
-
-0.3 to 7
-0.3 to 7
-0.3 to 7
-0.3 to 36
-0.3 to 36
Pin Descriptions (BD93941FP)
Pin No
1
2
3
4
5
FIN1
6
7
8
9
10
11
12
13
14
15
FIN2
16
17
18
19
20
Pin Name
AUTO
REG58
CS
N
DCDC_GND
GND
OVP
STB
LED1
LED2
LED_GND
N.C.
LED3
LED4
PWM
ISET
GND
SS
FB
RT
ADIM
VCC
In/Out
Out
Out
In
In
-
-
In
In
Out
Out
-
-
Out
Out
In
Out
-
Out
In/Out
Out
In
In
Overvoltage protection detection pin
Enable pin
Output pin 1 for LED
Output pin 2 for LED
Ground pin for LED
Non connection pin
Output pin 3 for LED
Output pin 4 for LED
External PWM light modulation signal input pin for LED1-4
LED current setting resistor connection pin
Analog GND pin
Soft start pin / LED protection masking time setting pin.
Error amp output pin
DC/DC drive frequency setting resistor connection pin.
Analog dimming DC voltage input pin
Power supply pin
Auto-restart time setting pin
Power supply for N pin
DC/DC output current detection and OCP detection pin
DC/DC switching output pin
Power GND pin
Function
Rating [V]
-0.3 ~ 7
-0.3 ~ 7
-0.3 ~ 7
-0.3 ~ 7
-
-
-0.3 ~ 36
-0.3 ~ 36
-0.3 ~ 60
-0.3 ~ 60
-
-
-0.3 ~ 60
-0.3 ~ 60
-0.3 ~ 36
-0.3 ~ 7
-
-0.3 ~ 7
-0.3 ~ 7
-0.3 ~ 7
-0.3 ~ 36
-0.3 ~ 36
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TSZ02201-0F1F0C100270-1-2
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