BD9421F_15 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)
BD9421F
General Description
BD9421F is high efficiency driver for white LED. This is
designed for large sized LCD. BD9421F is built-in
DCDC converters that supply appropriate voltage for
light source.
BD9421F 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
 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
SOP24
W(Typ) x D(Typ) x H(Max)
15.00mm x 7.80mm x 2.01mm
Pin Pitch 1.27mm
Figure 1. SOP24
Typical Application Circuit
Figure 2. Typical Application Circuit
〇Product structure : Silicon monolithic integrated circuit
.www.rohm.com
© 2013 ROHM Co., Ltd. All rights reserved.
TSZ22111 • 14 • 001
〇This product has no designed protection against radioactive rays
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TSZ02201-0F1F0C100310-1-2
25.Sep.2015 Rev.003