描述 Description

The MP4603 is an integrated white LED driver. It uses MPS? patent-pending technology to drive the backlights for LCD TVs measuring 60-inches or larger, for LED string voltages up to 350V. This novel technology can leverage the LED drive power by regulating only a small portion of the LED drive voltage?ogether with a fixed high-voltage source, a low-voltage LED driver can drive high voltage LED strings. This method allows for a super-high power density, higher efficiency and lower cost due to the low voltage stress, higher switching frequencies, and smaller passive components.?The MP4603 is a current-mode?ontrolled buck-boost regulator. With a 12V input VINL and a high voltage source VINH, it can deliver a regulated voltage (VINH to VINH+68V) to drive a LED string with up to 100 LEDs. It can drive an external switch in series with the LED string to achieve over 1:1000 dimming ratio. Analog dimming can be applied at the same time to further improve the dimming ratio. Fault protections include LED open-string protection, output short-circuit protection, cycle?y?ycle peak current limiting, and thermal shutdown.?The MP4603 is available in SOIC16 package.

特性 Features

● Novel Power-Leverage-Control Technology
● Unique Step-Up/Down Operation
● Up to 99.5% Efficiency
● 0.5O Internal Power MOSFET
● Switching Frequency Synchronization
● Over 1:1000 Dimming Ratio
● Separate Analog and PWM Dimming
● ?% 200mV Reference Voltage
● 10? Shutdown Mode
● Cycle-by-Cycle Over-Current Protection
● Thermal Shutdown Protection
● LED String Open and Short Protection
● FAULT Output at LED Protection
● Output Short-Circuit Protection
● Available in SOIC16 Package

簡介

MP4603屬于集成電路（IC）的LED驅(qū)動器。由制造生產(chǎn)的MP4603LED 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進(jìn)行外部控制，可在照明應(yīng)用中用于實現(xiàn)調(diào)光功能。