FN7630

Rev.2.00

Sep 13, 2017

ISL97675

4-Channel LED Driver with Phase Shift Control

DATASHEET

FN7630 Rev.2.00

Page 1 of 21

Sep 13, 2017

The ISL97675 is an LED driver that drives 4 channels of low power

LEDs from 4.5V to 26V input and up to 45V output.

The ISL97675 compensates for non-uniformity of the forward

voltage drops in the LED strings with its 4 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 the typical multi-string operation.

The ISL97675 offers two PWM Dimming modes: The part digitizes

the incoming 100Hz to 30kHz PWM signal and provides 8-bit PWM

dimming with phase shift function. Another mode is direct PWM

mode without phase shift, where the dimming frequency follows

the input PWM signal and the minimum on time can be as short as

350ns.

The ISL97675 features channel phase shift control to minimize the

input, output ripple characteristics and load transients as well as

spreading the light output to help eliminate or reduce the video and

audio noise interference from the backlight driver operation.

Related Literature

• For a full list of related documents, visit our website

- ISL97675 product page

Features

•4 x 30mA Channels

• 45V Output Max

• 4.5V to 26V Input

• Channel Phase Shift PWM Dimming with 8-bit Resolution

• 0.007% Direct PWM dimming at 200Hz

• Current Matching of ±1.5% from 1% ~ 100% Dimming

• Dynamic Headroom Control

•Protections

and Over-temperature Protections

- Optional Master Fault Protection

• Selectable 600kHz or 1.2MHz Switching Frequency

• 20 Ld QFN 4mmx4mm Package

Applications

• Netbook Displays LED Backlighting

• Notebook Displays LED Backlighting

OVP

FAULT

FB2

FB3

COMP

SW

PGND

RFPWM/DirectPWM

ISL97675

FB1

ISET

VIN

EN

VDDIO

PWM

AGND

FB4

FSW/Phase Shift

6

7

11

12

15

14

16

17

19

1

2

20

3

18

13

4

8

AGND

9

FIGURE 1. TYPICAL APPLICATION CIRCUIT

NOT RECOMMENDED FOR NEW DESIGNS

RECOMMENDED REPLACEMENT PARTS

ISL97671A or ISL97672B