AS3691A-ZQFP

Overview

The AS3691A-ZQFP is an LED lighting driver IC manufactured by ams OSRAM. It features four independent current sources designed for RGB LED applications, delivering a typical output current of 400 mA per channel. The device integrates PWM generators for precise brightness control and includes safety mechanisms such as thermal shutdown and open/short LED detection. Configuration is managed via I2C or SPI interfaces, allowing programmable parameters for duty cycle, period, and delay to support local dimming and scan dimming functions in display backlight systems.

Feature Summary

• Integrates four high-precision constant current sinks for RGB LED channels
• Includes built-in PWM generators with programmable delay, period, and duty cycle
• Supports synchronization with external clock inputs for LCD backlight alignment
• Features dynamic power feedback circuits for efficient white and RGB backlight operation

Applications

• LCD-TV backlight panels
• RGB LED lighting systems
• Local dimming display modules
• Scan dimming applications

Procurement Notes

Verify the exact suffix against official ams OSRAM documentation, as package variants like ZQFT may differ from ZQFP. Confirm end-of-life status and availability through authorized distributors. Ensure compatibility with existing PCB footprints and thermal management requirements before procurement.

Selection Notes

Select this component for designs requiring integrated PWM generation and high-current RGB driving in a single IC. Consider the QFP package for ease of assembly compared to smaller options. Evaluate thermal performance under maximum load conditions and ensure the I2C/SPI interface matches the system controller capabilities.

Part Context

This part belongs to the AS3691 series of LED drivers from ams OSRAM, specialized for high-precision backlighting. It shares functional similarities with other members like the AS3693A but differs in channel count and current specifications. The series targets advanced display technologies requiring synchronized dimming and robust safety features.

Replacement Considerations

Check for direct substitutes within the AS369x family, such as the AS3693A, noting differences in channel count and current ratings. Verify pin-to-pin compatibility if replacing on existing boards. Consult official cross-reference lists for any discontinued variants.