ISL97673

6-Channel SMBus or PWM Dimming LED Driver with Phase Shift Control

Product Status: Mass Production

OVERVIEW

The ISL97673 is a 6-Channel 45V dual dimming capable LED driver that can be used with either SMBus/I2 C or PWM signal for dimming control. The ISL97673 drives 6 channels of LED to support 78 LEDs from 4.5V to 26V or 48 LEDs from a boost supply of 2.7V to 26V and a separate 5V bias on the ISL97673 VIN pin.

The ISL97673 compensates for non-uniformity of the forward voltage drops in the LED strings with its six voltage controlled-current source channels. Its headroom control monitors the highest LED forward voltage string for output regulation, to minimize the voltage headroom and power loss in a typical multi-string operation.

The ISL97673 features optional channel phase shift control to minimize the input, output ripple characteristics, and load transients, as well as spreading the light output to help reduce video and audio interference from the backlight driver operation. The phase shift can be programmed with equal phase angle or adjustable in 7-bit resolution.

The ISL97673 has a full range of dimming capabilities that include SMBus/I2 C controlled PWM dimming or DC dimming. Another key feature of the ISL97673 is that it allows very linear PWM dimming from 0.4% to 100% of up to 30kHz. Current matching of 0.4% to 100% dimming achieves ±1% tolerance from 100Hz to 5kHz dimming and ±3% tolerance from 5kHz to 30kHz dimming.

KEY FEATURES

  • 6 channels
  • 4.5V to 26.5V input
  • 45V output max
  • Up to 40mA LED current per channel
  • Extensive dimming control
  • PWM/DPST dimming, I2C 8-bit with equal phase shift, and 0.007% direct PWM dimming at 200Hz
  • Optional master fault protection
  • PWM dimming linearity 0.4%~100% <30kHz
  • 600kHz/1.2MHz selectable switching frequency
  • Dynamic headroom control
  • Protections with flag indication
  • String open/short circuit, VOUT short circuit, overvoltage, and over-temperature protections
  • Optional master fault protection
  • Current matching ±0.7%
  • 20 Ld 4mmx3mm QFN package

BLOCK DIAGRAM

 Block Diagram

PARAMETRICS

Parameters
ISL97673
Basic Information
生产状态
Mass Production
器件/通道数量
6
DC/DC照明总电流 (mA)
240
输出电流最大值/通道 (mA)
40
输出电压最大值 (V)
45
亮度控制
SMBus, PWM or DC
总线/输出接口
SMBus/I2C
输入电压最大值 (V)
26.5
输入电压最小值 (V)
4.5
LCD背光尺寸 (最小值) (英寸)
0
LCD背光尺寸 (最大值) (英寸)
17
资质级别
Standard
峰值效率 (%)
92.9
LED数量 (最大值)
78
频率
0.6/1.2 MHz
IS (最大值)
5 mA
IQ (最大值)
5 µA
ISW (典型值) (mA)
2000
集成二极管
No
过压保护
Yes
故障开关
Yes
拓扑
Inductor Boost
输入电压范围 (V)
4.5 to 26.5
LCD背光尺寸
up to 17
温度范围
-40 to +85

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