LX23224IDB中文资料LED Drivers数据手册Microchip规格书

描述 Description

The LX23224 is a four channel LED driver for LED backlight applications in LCD TVs and monitors. It integrates a DC/DC block with peak current mode control and four PWM controllers to drive four LED strings. The DC/DC control loop adjusts the boost voltage for maximum power efficiency. LED string short circuit or open circuit conditions are detected, flagged, and protected against. Internal linear regulators provide 12V and 5V rails to drive internal circuitry from VIN voltage. Alternatively a 12V supply can be fed directly to the device. DC/DC switching frequency can be synchronized between multiple devices to prevent beat frequency interference. LX23224 supports Direct Digital PWM LED dimming. The LX23224 is provided in a 36-pin SSOP package.

特性 Features

·EDGE-Lit LED Backlight Driver for LCD TVs and Monitor Displays
·Direct Digital PWM LED Dimming Operation
·Supports LED PWM Dimming Frequency up to 2kHz
·2% Precision Current Control of Four LED Strings (string to string)
·3% Precision Current Control (chip to chip)
·Supports Four LED Strings with Control and Protection
·LED String Currents are Completely User Programmable
·100kHz to 300kHz Constant Switching Frequency Power Conversion
·Supports DC/DC Synchronization Across Multiple ICs
·Open String and Over-Temperature Protection and Indication
·LED String Short Circuit Protection and Indication
  ROHS, PB Free