ISL97672B中文资料6-Channel LED Driver with Ultra Low Dimming Capability数据手册Renesas规格书

描述 Description

The ISL97672B is an integrated 6-channel power LED driver for LCD backlight applications. The ISL97672B is capable of driving LEDs with an input from 4. 5V to 26. 5V and a maximum output up to 45V. The ISL97672B employs an adaptive boost switching architecture that allows direct PWM dimming with dimming duty cycle as low as 0. 007% at 200Hz or 0. 8% at 20kHz. PWM Dimming frequency can be as high as 30kHz. The ISL97672B employs dynamic headroom control that monitors the highest LED forward voltage string for output regulation to minimize headroom voltage and power loss in a typical multi-string operation. Typical current matching between channels is ±0. 7%. The ISL97672B incorporates extensive protection functions that flag whenever a fault occurs. The protections include string-open and short-circuit detections, OVP, OTP, and an optional output short-circuit protection with external fault disconnect switch. The ISL97672B is offered in a compact 20 Ld QFN 3x4 package and can operate in ambient temperatures of -40°C to +85°C.

特性 Features

• 6 x 50mA channels
• 4.5V to 26.5V input
• 45V output maximum
• Adaptive boost switching architecture
• Direct PWM dimming with dimming linearity of 0.007%~100% at 200Hz or 0.8%~100% <20kHz
• Adjustable 200kHz to 1.4MHz switching frequency
• Dynamic headroom control
• Fault protections with latched flag indication
• String open/short-circuit
• Overvoltage Protection (OVP)
• Over-Temperature Protection (OTP)
• Optional output short-circuit fault protection switch
• Current matching ±0.7%
• 20 Ld 3x4 QFN package

应用 Application

• Notebook displays LED backlighting
• LCD monitor LED backlighting
• Multi-function printer scanning light source