AT9919 Description
The AT9919 is a PWM controller IC designed to drive high brightness LEDs using a buck topology. It operates from an input voltage of 4.5 to 40VDC and employs hysteretic control with a high-side current sense resistor to set the constant output current. The operating frequency range can be set by selecting the proper inductor.
AT9919 Key Features
- Hysteretic control with high-side current sensing -- Wide input voltage range: 4.5 to 40V -- >90% Efficiency -- Typical