8-Channel Local-Dimming LED Driver

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.

Archived content is no longer updated and is made available for historical reference only.

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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

MoreLess

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