ISL97673_10 Datasheet, PDF (1/27 Pages) Intersil Corporation – 6-Channel SMBus or PWM Dimming LED Driver with Phase Shift Control

6-Channel SMBus or PWM Dimming LED Driver
with Phase Shift Control
ISL97673
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 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 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 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 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.
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, 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 26)
• Notebook Displays WLED or RGB LED Backlighting
• LCD Monitor LED Backlighting
• Automotive Displays LED Backlighting
Typical Application Circuit
V_IN = 4.5~26.5V
V_OUT = 45V*, 40mA PER CHANNEL
June 24, 2010
FN7633.0
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
*V_IN > 12V
FIGURE 1. ISL97673 TYPICAL APPLICATION DIAGRAM
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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