MC34848数据手册恩XP中文资料规格书

描述 Description

Overview The MC34848 is a high efficiency, 8-channel LED driver for use in LCD backlighting applications. It is designed to support up to 160 mA /channel in scan backlight mode, or 80 mA/channel in local dimming mode. Current reference is set using a single resistor to GND and the LED current tolerance is accurate to ±1% channel-to-channel and IC-to-IC. The current can be programmed in both local dimming and scan modes. Each channel has independent PWM control with 10-bit resolution, programmed with high speed differential interface.
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特性 Features

•Drives 8 LED channels: ±1% current tolerance

•Local dimming mode, scan mode (2/8, 3/8, 4/8, 5/8), test mode

•Output voltage up to 45 V supporting up to 12 LEDs

•Auto drive voltage (VOUT) selection: Minimum feedback voltage 500 mV for low power

•Differential Interface: Initial setup (LED current, fPWM, OVP, etc.), PWM data in normal operation

•Integrated PLL for synchronization: 177 Hz – 1200 Hz in 1.0 Hz steps

•10-bit PWM control per channel: Dimming ratio: >1000:1, turn-on time: <200 ns

•This product is included in NXP’s product longevity program, with assured supply for a minimum of 10 years after launch