ISL97673IRZ 查看數據表（PDF） - Renesas Electronics

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ISL97673IRZ

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

Renesas Electronics 

ISL97673

NOT RECOMMENDED FOR NEW DESIGNS

RECOMMENDED REPLACEMENT PARTS

ISL97671A or ISL97672B

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

DATASHEET

FN7633

Rev.3.00

Sep 19, 2017

The ISL97673 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

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/I2C 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.

Typical Application Circuit

VIN = 4.5~26.5V

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

VOUT = 45V*, 40mA PER CHANNEL

ISL97673

1 FAULT

2 VIN

4 VDC

LX 20

OVP 16

18 COMP

PGND 19

7 SMBCLK(SCL)/SEL2

6 SMBDAT(SDA)/ CH0 10

_FLAG

CH1 11

3 EN/PWM

CH2 12

17 RSET

CH3 13

8 FPWM

CH4 14

5 SEL1

CH5 15

AGND 9

*VIN > 12V

FIGURE 1. ISL97673 TYPICAL APPLICATION DIAGRAM

FN7633 Rev.3.00

Sep 19, 2017

Page 1 of 28

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