MP4603中文资料Power-Leverage Buck-Boost WLED Driver with Separate ADIM and PDIM数据手册MPS规格书

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