These parts are no longer in production The device should not be purchased for new design applications. Samples are no longer available. The A8511 is a fully integrated HB LED driver for medium displays, featuring an integrated boost converter and four 150mA current sinks (up to 600mA). It operates from 6.8V to 21V (40V withstand), offers 2MHz switching for AM band avoidance, 1000:1 PWM dimming, output disconnect, and optional thermal limiting.
Product Details
Product Details
Top Features
- Four LED sinks rated for 150 mA each (600 mA total)
- Boost converter with integrated 40 V DMOS switch and OVP–load-dump protection
- 600 kHz to 2.2 MHz switching frequency—ability to operate above the AM band
- Internal bias supply for single-supply operation (VIN = 6.8 to 21 V)
- 3.5 µA shutdown current—limits battery drain
- Active current sharing between LED strings for 0.8% current matching and 0.7% accuracy
- PWM dimming with LED PWM duty cycle control
- 4000:1 dimming range
- Extensive fault mode protection schemes:
- Shorted LED protection against misconnected loads — with true output disconnect
- Open LED disconnect protects against LED failures
- External thermistor sensing to limit LED temperature
- Output overvoltage protection (OVP): 19.5 V default can be adjusted as high as 38 V
- Open Schottky and open OVP resistor protection against external component failure
- Input under- and overvoltage protection (UVLO and OVLO) against VIN variation
- Boost current limit, output short circuit limit, overtemperature protection (OTP), and soft start
