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BD9470AFM

更新时间： 2024-12-02 11:15:39
品牌 Logo 应用领域
罗姆 - ROHM 驱动电路保护驱动器转换器
页数 文件大小 规格书
38页 1783K
描述
BD9470AFM是白色LED用高效率驱动器，适用于大屏幕液晶驱动器。BD9470AFM内置了可向光源（LED串联连接的阵列）提供适当电压的DCDC转换器。BD9470AFM内置了过电压保护（OVP: over voltage protection）、过电流检测（OCP: over current limit protection of DCDC）、短路电路保护（SCP: short circuit protection）、开路保护（open detection of LED string）等针对异常状态的保护功能。因此，可在更宽的输出电压条件及负载条件下使用。

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BD9470AFM 数据手册

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Datasheet  
LED driver series for LCD back light  
White LED driver for medium sized  
and large sized LCD back light  
BD9470AEFV・BD9470AFM  
●General Description  
●Key Specifications  
BD9470AEFV and BD9470AFM are high efficiency  
driver for white LED. They are designed for large sized  
LCD. BD9470AEFV and BD9470AFM are built-in  
DCDC converter that supply appropriate voltage for  
light source.  
BD9470AEFV and BD9470AFM are 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.  
VCC supply Voltage range:  
LED minimum output current:  
LED maximum output current:  
DCDC oscillation frequency: 150KHz(RT=100Kohm)  
Operation circuit current:  
9.0V～35.0V  
40mA  
250mA  
6mA(typ.)  
-40℃～85℃  
Operating temperature range:  
●Applications  
■ LED driver for TV, monitor and LCD back light  
Thus they are used for conditions of large output  
voltage and load conditions.  
●Package  
●Features  
W (Typ.) x D(Typ.) x H(Max.)  
18.50mm x 9.90mm x 2.41mm  
9.70mm x 6.40mm x 1.00mm  
6ch LED constant current driver  
LED maximum output current 250mA  
Individual PWM dimming modulation allowed for  
HSOP-M28  
HTSSOP-B28  
LEDs  
±2% LED current accuracy (when each LED is set  
to 130mA)  
Built-in LED feedback voltage automatic adjustment  
circuit according to LED current  
Built-in start-up circuit independent of PWM light  
modulation  
built-in VOUT・FB voltage maintenance function  
when PWM=Low（0%）  
Built-in LED current stabilization circuit while  
scanning operation is performed  
Built-in VOUT discharge circuit while shutdown  
Built-in LED protection (OPEN / SHORT protection)  
Figure 1. HSOP-M28  
Individual detection and individual LED OFF for  
both open and short circuit  
Adjustable LED short-circuit protection threshold  
PWM-independent LED protection  
VOUT over voltage protection (OVP) and reduced  
voltage protection (SCP) circuit  
Built-in failure indication function  
Built-in ISET pin short-circuit protection circuit  
●Typical Application Circuit  
VIN  
ISET  
SS  
FB  
PWM1  
PWM2  
PWM3  
PWM4  
PWM5  
RT  
DCDC_GND  
N
CS  
PWM  
Figure 2. HTSSOP-B28  
REG58  
PWM6  
VCC  
STB  
GND  
STB  
FAIL  
FAIL  
OVP  
LSP  
LED6  
LED5  
LED4  
LED_GND  
UVLO  
LED1  
LED2  
LED3  
Figure 3. Typical Application Circuit  
○Product structure：Silicon monolithic integrated circuit ○This product is not designed protection against radioactive rays  
www.rohm.com  
TSZ02201-0F10C1002000-1-2  
19.Oct.2013 Rev.003  
© 2013 ROHM Co., Ltd. All rights reserved.  
1/35  
TSZ22111・14・001  
1234567...38

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