A8512屬于集成電路（IC）的LED驅(qū)動器。由Allegro MicroSystems制造生產(chǎn)的A8512LED 驅(qū)動器器件屬于 LED 驅(qū)動器電源管理集成電路 (PMIC) 系列，可通過標(biāo)稱固定電壓的電源為負(fù)載（通常為發(fā)光二極管）提供電流，并且電流可控。它與用于電壓調(diào)節(jié)的類似產(chǎn)品的主要區(qū)別在于，這類器件提供較低的反饋電壓（以提高系統(tǒng)能效），而且通?？蓪ζ骷ぷ鼽c(diǎn)進(jìn)行外部控制，可在照明應(yīng)用中用于實(shí)現(xiàn)調(diào)光功能。

描述 Description

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 current-sinks. 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 combined 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.

Features and Benefits

? 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

battery voltage ramp

? Parallel operation with one boost controller (master) and up to

five slave controllers

? Active current sharing between LED strings for ±0.6 accuracy

and matching

? No audible MLCC noise during PWM dimming

? Adjustable overvoltage protection (OVP)

? Open or shorted LED string protection

? Overtemperature, cycle-by-cycle current limit, and

undervoltage protection

? SOIC 24-pin package for easy single-side PCB manufacturing,

or TSSOP 24-pin and QFN 28-contact packages with exposed

thermal pad for better thermal performance