DW8523A 2ch High-Brightness Buck converter LED Driver IC
DW8523A General Description
The DW8523A is a high efficiency step down converter for LED driver IC which provide a solution for LED lighting of flat panel luminance and general DC voltage LED applications.
The DW8523A built in high side LED current sensing circuit and protection circuit same as TSD, LED open,LED short and ambient temperature protection. And DW8523A is integrated MCU interface circuit for faults detection. In these fault, MCU interface pin voltage pull down. And DW8523A can adjust LED current by external analog signal. DW8523A can transfer external analog adjust signal to PWM logic signal. Practically, LED current is adjusted by PWM logic signal and analog dimming signal simultaneously. Thus DW8523A can prevent LED current flicker when LED current is low by analog dimming. And frequency of the PWM frequency is determined by external capacitor. The DW8523A are well suited for applications requiring a wide input voltage range. The high side current sensing and an integrated current-setting circuitry minimize the number of external components while delivering an LED current with +/-2.5% accuracy. A hysteretic control algorithm ensures excellent input supply rejection and fast response during load transient and PWM dimming. The DW8523A feature a 10% inductor current ripple. These devices operate up to 2MHz switching frequency. Thus allowing for small component size.
DW8523A Features ：
● 6.5V to 60V Input voltage range
●2-Channel hysteretic buck control
●+/-2.5% LED current accuracy
●Up to 95 % efficiency (VIN=34.5V, VLED=30V, ILED=400mA 2channel)
●Analog and PWM dimming simultaneously
●Various Fault detection(LED open/short, Temperature, TSD,Protection function with external NTC)
●Up to 2MHz switching frequency
●Wide temperature range : -40 to 125℃
●Over temperature derating (30%)
●SOIC-16L Package
DW8523A Applications：
●Flat panel LED lighting
●LED down light
● Architectural lighting
DW8523A Block Diagram：
DW8523A Pin Information：
DW8523A Typical Application Circuit：
LED car light application cases：
