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Rohm Semiconductor Electronic Components Datasheet

BD93942F Datasheet

White LED Driver

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Datasheet
LED Drivers for LCD Backlights
White LED Driver for large LCD
Panels (DCDC Converter type)
BD93942F
General Description
BD93942F 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. BD93942F 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 BD93942F 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:
150mA
Oscillator frequency:
150kHz (RT=100k)
Operating Current:
3.7mA (Typ.)
Operating temperature range:
-40°C to +85°C
Features
4ch LED constant current driver and DC/DC converter
Maximum LED Current: 150mA
LED Feedback Voltage: 0.45V (@ILED=150mA)
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
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
SOP16 package
Applications
TV, Computer Display, Notebook, LCD Backlighting
Package
SOP16
W(Typ.) x D(Typ.) x H(Max.)
10.00mm x 6.20mm x 1.71mm
Typical Application Circuit
Figure 1. SOP16
VIN
VIN
Inductor
Diode
CIN
FET
PGND
AGND
COUT
REG58
CREG
RN2
RCS DN RN1
ROVP1
ROVP2
RRT
COVP
RFB CFB1
ADIM
RISET
REG58
N
GND
CS
RT
OVP
SSFB
ISET
ADIM
STB
VCC
LED4
LED3
LED2
LED1
PWM
ON/ OFF
RVCC
CVCC
CLED4
CLED3
CLED2
CLED1
PWM
Figure 2. Typical Application Circuit
Product structureSilicon monolithic integrated circuit
.www.rohm.com
© 2015 ROHM Co., Ltd. All rights reserved.
TSZ2211114001
This product has not designed protection against radioactive rays
1/26
TSZ02201-0F5F0C100050-1-2
12.Aug.2015 Rev.002


Rohm Semiconductor Electronic Components Datasheet

BD93942F Datasheet

White LED Driver

No Preview Available !

BD93942F
Datasheet
Absolute maximum ratings (Ta=25°C)
Parameter
Symbol
Power supply voltage
VCC
STB, ADIM, OVP, PWM terminal voltage
STB, ADIM, OVP, PWM
LED1 to 4 terminal voltage
LED1 to 4
REG58, CS, N, ISET, SSFB, RT terminal voltage
REG58, CS, N,
ISET, SSFB, RT
Power dissipation (SOP16)
Pd
Operating temperature range
Topr
Storage temperature range
Tstg
Junction temperature
*1 Ta = 25°C or more, diminished at -5mW/°C in the case of SOP16
(when 1-layer / 70.0 mm x 70.0 mm x 1.6 mm board is mounted)
Tjmax
Ratings
36
36
60
7
0.62 *1
-40 to +85
-55 to +150
150
Unit
V
V
V
V
W
°C
°C
°C
Operating Ratings
Parameter
Symbol
Limits
Unit
VCC supply voltage
VCC
9.0 to 35.0
V
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)
ILED_MIN
ILED_MAX
VADIM1
VADIM2
30
150
0.2 to 2.7 (normal op.)
1.0 to 2.7 (start up)
REG58 to 35.0
mA *1
mA
*1,2
V *3
V
DC/DC oscillation frequency
Fsw
100 to 800
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
1 REG58
2 CS
3N
4 GND
5 OVP
6 STB
7 LED1
8 LED2
VCC 16
ADIM 15
RT 14
SSFB 13
ISET 12
PWM 11
LED4 10
LED3 9
www.rohm.com
© 2015 ROHM Co., Ltd. All rights reserved.
TSZ2211115001
SOP16
Figure 3. Pin Configuration
2/26
TSZ02201-0F5F0C100050-1-2
12.Aug.2015 Rev.002


Part Number BD93942F
Description White LED Driver
Maker ROHM
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