HV9911 Overview
Description
The HV9911 is an LED driver IC designed to control single-switch PWM converters (buck, boost, buck-boost and SEPIC) in a Constant Frequency or Constant Off-time mode. The controller uses a peak current control scheme with programmable slope compensation and includes an internal transconductance amplifier to control the output current in closed loop, enabling high output current accuracy.
Key Features
- Switch-mode Controller for Single-switch Drivers
- Works with High-side Current Sensing
- Closed-loop Control of Output Current
- High Pulse-Width Modulation (PWM) Dimming Ratio
- Internal 250V Linear Regulator (can be extended using external Zener Diodes)
- Internal 2% Voltage Reference (0°C < TA < 85°C)
- Constant Frequency or Constant Off-time Operation
- Programmable Slope Compensation
- Logic Input for Enable and PWM Dimming
- +0.2A/-0.4A Gate Driver
