BD93942F Datasheet, PDF (1/30 Pages) Rohm – White LED Driver for large LCD Panels (DCDC Converter type)

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=100kΩ)
 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
RRT
ROVP1
ROVP2
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 structure：Silicon monolithic integrated circuit
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TSZ22111・14・001
○This product has not designed protection against radioactive rays
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12.Aug.2015 Rev.002