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ISL97671A Datasheet PDF : 28 Pages
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DATASHEET
ISL97671A
6-Channel SMBus/I2C or PWM Dimming LED Driver with Phase Shift Control
FN7709
Rev.4.00
Sep 14, 2017
The ISL97671A 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 ISL97671A can drive six channels of
LEDs from an input of 4.5V~26.5V to an output of up to 45V. It
can also operate from an input as low as 3V to an output of up
to 26.5V in bootstrap configuration (refer to Figure 38 on
page 26).
The ISL97671A features optional channel phase shift control
to minimize the input/output ripple characteristics, and load
transients to improve efficiency and eliminate audible noise.
The device can also be configured for Direct PWM Dimming
with a minimum dimming duty cycle of 0.007% at 200Hz.
The ISL97671A headroom control circuit 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 ISL97671A is offered in a compact and thermally efficient
20 Ld QFN 4mmx3mm package.
Related Literature
• For a full list of related documents, visit our website
- ISL97671A product page
Features
• 6 x 50mA channels
• 4.5V to 26.5V input with 45V maximum output
• 3V (see Figure 38 on page 26) to 21V input with 26.5V
maximum output
• PWM dimming with phase shift control
• SMBus/I2C controlled PWM or DC dimming
• Direct PWM dimming
• PWM dimming linearity
- PWM dimming with adjustable dimming frequency and
duty cycle linear from 0.4% to 100% <30kHz
- Direct PWM dimming duty cycle linear from 0.007% to
100% at 200Hz
• Current matching ±0.7%
• 600kHz/1.2MHz selectable switching frequency
• Dynamic headroom control
• Fault protection
- String open/short-circuit, OVP, OTP, and optional output
short-circuit fault protection
• 20 Ld 4mmx3mm QFN package
Applications
• Tablet PC to notebook displays LED backlighting
• LCD monitor LED backlighting
• Field sequential RGB LED backlighting
Typical Application Circuits
VIN = 4.5~26.5V
Q1 (OPTIONAL)
ISL97671A
1 FAULT
2 VIN
4 VDC
LX 20
OVP 16
PGND 19
7 SMBCLK/SCL
6 SMBDAT/SDA CH0 10
5 PWM
3 EN
CH1 11
CH2 12
CH3 13
17 RSET
CH4 14
8 FPWM
CH5 15
9 AGND
COMP 18
45V*, 6 x 50mA
*VIN > 12V
VIN = 4.5~26.5V
Q1 (OPTIONAL)
ISL97671A
1 FAULT
2 VIN
4 VDC
LX 20
OVP 16
PGND 19
7 SMBCLK/SCL
6 SMBDAT/SDA CH0 10
5 PWM
3 EN
CH1 11
CH2 12
CH3 13
17 RSET
CH4 14
8 FPWM
CH5 15
9 AGND
COMP 18
45V*, 6 x 50mA
*VIN > 12V
VIN = 4.5~26.5V
Q1 (OPTIONAL)
ISL97671A
1 FAULT
2 VIN
4 VDC
LX 20
OVP 16
8 FPWM
PGND 19
7 SMBCLK/SCL
6 SMBDAT/SDA CH0 10
5 PWM
3 EN
CH1 11
CH2 12
CH3 13
17 RSET
CH4 14
CH5 15
9 AGND
COMP 18
45V*, 6 x 50mA
*VIN > 12V
FIGURE 1A. SMBus/I2C CONTROLLED
DIMMING AND ADJUSTABLE
DIMMING FREQUENCY
FIGURE 1B. PWM DIMMING WITH PWM INPUT
AND ADJUSTABLE DIMMING
FREQUENCY
FIGURE 1. ISL97671A TYPICAL APPLICATION DIAGRAMS
FIGURE 1C. DIRECT PWM DIMMING
FN7709 Rev.4.00
Sep 14, 2017
Page 1 of 28
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