A8512 Overview
The A8512 is a multi-output WLED/RGB driver for backlighting LCD monitors and televisions. It integrates a boost controller to drive external MOSFET, and six internal currentsinks. The boost converter operates in constant frequency (programmable) current mode control. PWM dimming allows LED currents to be controlled in 500:1 ratio. The LED sink current is set by an external R_ISET resistor (see chart below). More than one LED sinks can be bined together to achieve even higher current per LED string. Multiple A8512s can be connected in parallel, with one master controller controlling the boost stage, and up to five slave controllers, which act as LED sinks. This allows up to 36 LED strings to be powered by just one boost converter. TheA8512 operates from a single supply of 8 to24 V. It provides protection against overvoltage, open or shorted LED string, and overtemperature. A dual level...
A8512 Key Features
- Six integrated high current sinks
- Fixed frequency current mode control with integrated gate driver
- 300 kHz to 1 MHz adjustable switching frequency
- Controlled startup using options of Enable, PWM signal, or
- Parallel operation with one boost controller (master) and up to
- Active current sharing between LED strings for ±0.6% accuracy
- No audible MLCC noise during PWM dimming
- Adjustable overvoltage protection (OVP)
- Open or shorted LED string protection
- Overtemperature, cycle-by-cycle current limit, and