AT9919 Description
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 VDC to 40 VDC 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
- AEC-Q100 Qualified
- Hysteretic Control with High-side Current Sensing
- Wide Input Voltage Range: 4.5V to 40V
- >90% Efficiency
- Typical ±5% LED Current Accuracy
- Up to 2 MHz Switching Frequency
- Adjustable Constant LED Current
- Analog or Pulse-Width Modulation (PWM) Control
- Overtemperature Protection
- 40ºC to +125ºC Operating Temperature Range