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6-Channel SMBus/I 2 C or PWM Dimming LED Driver with
Phase Shift Control
ISL97671A
The ISL97671A is a 6-Channel 45V dual dimming capable LED
driver that can be used with either SMBus/I 2 C 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 (see Figure 38).
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 in Direct PWM Dimming
with 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 compact and thermally efficient
20 Ld QFN 4mmx3mm package.
Features
? 6 x 50mA channels
? 4.5V to 26.5V input with max 45V output
? 3V (see Figure 38) to 21V input with max 26.5V output
? PWM dimming with phase shift control
? SMBus/I 2 C 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
45V*, 6 x 50mA
VIN = 4.5~26.5V
45V*, 6 x 50mA
VIN = 4.5~26.5V
45V*, 6 x 50mA
Q1 (OPTIONAL)
ISL97671A
Q1 (OPTIONAL)
ISL97671A
Q1 (OPTIONAL)
ISL97671A
1 FAULT
2 VIN
4 VDC
LX 20
OVP 16
1 FAULT
2 VIN
4 VDC
LX 20
OVP 16
1 FAULT
2 VIN
4 VDC
LX 20
OVP 16
PGND 19
7 SMBCLK/SCL
PGND 19
7 SMBCLK/SCL
8 FPWM
7 SMBCLK/SCL
PGND 19
6 SMBDAT/SDA CH0 10
6 SMBDAT/SDA CH0 10
6 SMBDAT/SDA CH0 10
5 PWM
3 EN
CH1 11
CH2 12
CH3 13
5 PWM
3 EN
CH1 11
CH2 12
CH3 13
5 PWM
3 EN
CH1 11
CH2 12
CH3 13
17 RSET
8 FPWM
9 AGND
CH4 14
CH5 15
COMP 18
*VIN > 12V
17 RSET
8 FPWM
9 AGND
CH4 14
CH5 15
COMP 18
*VIN > 12V
17 RSET
9 AGND
CH4 14
CH5 15
COMP 18
*VIN > 12V
FIGURE 1A. SMBus/I 2 C 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
November 30, 2012
FN7709.3
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774 | Copyright Intersil Americas Inc. 2011, 2012. All Rights Reserved
Intersil (and design) is a trademark owned by Intersil Corporation or one of its subsidiaries.
All other trademarks mentioned are the property of their respective owners.
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