ISL97672_10 Datasheet, PDF (1/17 Pages) Intersil Corporation – 6-Channel LED Driver

6-Channel LED Driver
ISL97672
The ISL97672 is an integrated power LED driver that
controls 6 channels of LED current for LCD backlight
applications. The ISL97672 is capable of driving up to
78 LEDs from 4.5V to 26V or 48 LEDs from a boost
supply of 2.7V to 26V and a separate 5V bias supply on
the VIN pin.
The ISL97672 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 ISL97672 allows direct PWM mode by following the
external signal from 0Hz to 30KHz at 0.4% to 100% duty
cycle and maintaining a typical ±0.7% current matching
between channels.
The ISL97672 features a separate EN pin and extensive
protection functions that flag whenever a fault occurs.
The protections include string open and short circuit
detections, OVP, OTP, thermal shutdown and an optional
input overcurrent protection with fault disconnect switch.
Typical Application Circuit
V_IN = 4.5V~26.5V
Features
• 6 Channels
• 4.5V to 26.5V Input
• 45V Output Max
• Up to 40mA LED Current per channel
• Direct PWM Dimming without Phase Shift
• PWM Dimming Linearity 0.4%~100% <30kHz
• Adjustable 200kHz to 1.4MHz Switching Frequency
• Dynamic Headroom Control
• Protections with Flag Indication
- String Open/Short Circuit, V_OUT Short Circuit,
Overvoltage and Over-Temperature Protections
- Optional Master Fault Protection
• Current Matching ±0.7%
• 20 Ld 4mmx3mm QFN Package
Applications*(see page 16)
• Notebook Displays LED Backlighting
• LCD Monitor LED Backlighting
• Automotive Displays LED Backlighting
• Automotive or Traffic Lighting
V_OUT = 45V*, 40mA PER STRING
ISL97672
1 _FAULT
2 _VIN
4 _VDC
LX 20
OVP 16
18 _COMP
6 _/FLAG
PGND 19
CH0 10
5 PWM
3 EN
17 _RSET
8 _FSW
CH1 11
CH2 12
CH3 13
CH4 14
CH5 15
9 _AGND
* V_IN > 12V
FIGURE 1. ISL97672 TYPICAL APPLICATION DIAGRAM
June 24, 2010
FN7632.0
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774 | Intersil (and design) is a registered trademark of Intersil Americas Inc.
Copyright Intersil Americas Inc. 2010. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.