AT9917
Description
The AT9917 is an advanced fixed frequency PWM IC designed to control single-switch, boost, SEPIC, and buck LED drivers in a constant current mode. The controller uses a peak current-mode control scheme (with programmable slope compensation) and includes an internal transconductance amplifier to control the output current with high accuracy.
Key Features
- Switch mode controller for boost, SEPIC & buck converters
- Closed loop control of output current
- High PWM dimming ratio
- Internal 40V linear regulator
- Internal 3% voltage reference
- Constant frequency operation with programmable slope compensation
- Linear and PWM dimming
- Programmable jitter to reduce EMI
- +/-1.0A MOSFET gate driver
- Output short circuit protection
