BD9420F Datasheet, PDF (1/31 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)
BD9420F
General Description
BD9420F is high efficiency driver for white LED. This is
designed for large sized LCD. BD9420F is built-in
DCDC converter that supply appropriate voltage for
light source.
BD9420F is also built-in protection function for
abnormal state such as OVP: over voltage protection,
OCP: over current limit protection of DCDC, SCP: short
circuit protection, open detection of LED string.
Thus this is used for conditions of large output voltage
and load conditions.
Features
 6ch LED constant current driver(External PNP Tr
Type)
 Maximum LED setting current 500mA(VREF Pin
setting)
 ±2% LED current accuracy(VREF=0.9V setting)
 Built-in DC/DC converter
 Analog Dimming(Linear) function
 Built-in PWM-independent soft start circuit
 LED protection function(OPEN/SHORT
protection)[PWM-independent Type]
 Individual detection and individual LED OFF for both
OPEN and SHORT circuit
 VOUT Over Voltage Protection(OVP) and reduced
voltage protection(SCP) circuit
 Built-in under voltage lockout function(UVLO) and
over voltage protection(OVP)
 Built-in VOUT discharge circuit while shutdown
Key Specifications
 VCC Supply Voltage Range:
9.0V to 35.0V
 DCDC Oscillation Frequency: 150kHz(RT=100kΩ)
 Operation Circuit Current:
5mA(Typ)
 Operating Temperature Range: -40°C to +85°C
Applications
 LED driver for TV, Monitor and LCD Back Light
Package
SOP28
W(Typ) x D(Typ) x H(Max)
18.50mm x 9.90mm x 2.41mm
Pin Pitch 1.27mm
Figure 1. SOP28
Typical Application Circuit
Figure 2. Typical Application Circuit
〇Product structure : Silicon monolithic integrated circuit 〇This product has no designed protection against radioactive rays
.www.rohm.com
© 2013 ROHM Co., Ltd. All rights reserved.
TSZ22111 • 14 • 001
1/28
TSZ02201-0F1F0C100300-1-2
31.Jan.2014 Rev.002