ISL97671IRZ-T Просмотр технического описания (PDF) - Renesas Electronics

Номер в каталоге

Компоненты Описание

производитель

ISL97671IRZ-T

6-Channel SMBus/I2C or PWM Dimming LED Driver with Phase Shift Control

Renesas Electronics 

ISL97671

OBSOLETE PRODUCT

RECOMMENDED REPLACEMENT PART

ISL97671A or ISL97672B

6-Channel SMBus/I2C or PWM Dimming LED Driver with Phase Shift Control

DATASHEET

FN7631

Rev.4.00

Sep 7, 2017

The ISL97671 is a 6-Channel 45V dual dimming capable LED

driver that can be used with either SMBus/I2C or PWM signal

for dimming control. The ISL97671 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 ISL97671

VIN pin.

The ISL97671 compensates for non-uniformity of the forward

voltage drops in the LED strings with its 6 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 ISL97671 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

the 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 ISL97671 has a full range of dimming capabilities that

include SMBus/I2C controlled PWM dimming or DC dimming.

It can also do direct PWM dimming with as low as 350ns pulse

on PWM pin, which translates to a duty-cycle of 0.007% at a

200Hz dimming frequency.

Related Literature

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

- ISL97671 product page

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

Applications

• Notebook Displays WLED or RGB LED Backlighting

• LCD Monitor LED Backlighting

• Automotive Displays LED Backlighting

• Automotive or Traffic Lighting

VIN = 4.5~26.5V

VOUT = 45V*, 40mA PER STRING

ISL97671

1 FAULT

2 VIN

4 VDC

LX 20

OVP 16

PGND 19

7 SMBCLK/SCL

6 SMBDAT/SDA

5 PWM

3 EN

CH0 10

CH1 11

CH2 12

CH3 13

17 RSET

CH4 14

8 FPWM

9 AGND

CH5 15

COMP 18

*VIN > 12V

FIGURE 1. ISL97671 TYPICAL APPLICATION DIAGRAM WITH SMBus/I2C CONTROL

FN7631 Rev.4.00

Sep 7, 2017

Page 1 of 27

Share Link: