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Compact 2-3-4-Ch LED Drivers with Phase Shift Control
ISL97682, ISL97683, ISL97684
The ISL97682, ISL97683, ISL97684 are Intersil’s highly
integrated 2-3-4-channels LED drivers that are suitable for
medium size TFT-LCD backlights. These parts can drive multiple
channels of LEDs from inputs as low as 4V to outputs of up to
45V. They can also operate from inputs as low as 3V to outputs of
up to 26.5V in bootstrap configuration (see Figure 26 for 3V
operation).
The ISL97682, ISL97683, ISL97684 feature optional channels
phase shift control. This feature is used to minimize the input,
output ripple characteristics and load transient, which help
eliminate or reduce the video and audio noise interference from
the backlight driver operation.
The ISL97682, ISL97683, ISL97684 offer 8-bit PWM dimming for
systems that need frequency tuning flexibility. With the unique
adaptive boost switching architecture, the ISL97682, ISL97683,
ISL97684 also offer Direct PWM dimming with output, which
follows input and achieves linearity as low as 0.009% at 200Hz
or 1.35% at 30kHz.
The drivers incorporate dynamic headroom control that monitors
the highest LED forward voltage string and uses its feedback signal
for the minimum output regulation. The ISL97682, ISL97683,
ISL97684 incorporates extensive fault protection functions including
string open and short circuit detections, OVP, and OTP. The switching
frequency can be selected at either 600kHz or 1.0MHz in PFM or
PWM mode. These parts are available in the thin and compact
16 Ld 3mmx3mm TQFN package and operate in ambient
temperature from -40°C to +85°C.
Features
? ISL97682 - 2 x 100mA Channels
? ISL97683 - 3 x 50mA Channels
? ISL97684 - 4 x 50mA Channels
? Input Voltage 4.0V~26.5V with Max V OUT of 45V
? Input Voltage 3.0V (see Figure 26)~24V with Max V OUT of 26.5V
? PWM Dimming Linearity
- PWM Dimming with Adjustable Dimming Frequency with
Duty Cycle Linear from 0.4% to 100% <30kHz
- Direct PWM Dimming with Duty Cycle Linear from 0.009%
to 100% at 200Hz
? Current Matching of 0.7% typical from 1%~100% Dimming
? Selectable 600kHz or 1MHz Switching Frequency in PWM/PFM
Mode
? Dynamic Headroom Control
? Fault Protection
- String Open/Short Circuit Protections, OVP, OTP
? Thin and Compact TQFN-16 3mmx3mm Package
Applications
? Tablet to Notebook PC Displays LED Backlighting
? PMP LED Backlighting
V IN = 4~26.5V
Ci
L1
10μH
D1
45V, 4 x 50mA*
Co
Ci
V IN = 4~26.5V
L1
10μH
D1
45V, 4 x 50mA*
Co
10μF
7 VIN
LX 9
4.7μF
10μF
7 VIN
LX 9
4.7μF
0.1μF
1μF
11 VDC
6 EN
ISL97684
OVP 12
0.1μF
1μF
11 VDC
6 EN
ISL97684
OVP 12
5 PWMI
5 PWMI
3 RSET
8 FPWM/DIRECTPWM
4 FSW
2 COMP
PGND 10
CH1 13
CH2 14
CH3 15
3 RSET
8 FPWM/DIRECTPWM
4 FSW
2 COMP
PGND 10
CH1 13
CH2 14
CH3 15
33pF
10k ?
8.2nF
1 AGND
CH4 16
*V IN > = 9V AND WITH
GOOD LEDS MATCHING
33pF
10k ?
8.2nF
1 AGND
CH4 16
*V IN >=9V AND WITH
GOOD LEDS MATCHING
FIGURE 1A. DIRECT PWM DIMMING FIGURE 1B. PWM DIMMING WITH DIMMING FREQUENCY
ADJUSTMENT USING R FPWM
FIGURE 1. ISL97684 TYPICAL APPLICATION DIAGRAMS
May 16, 2012
FN7689.1
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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ISL97687IBZEV1Z 制造商:Intersil 功能描述:ISL97687 EVAL