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ISL97636 PDF даташит

Спецификация ISL97636 изготовлена ​​​​«Intersil Corporation» и имеет функцию, называемую «8-Channel LED Driver».

Детали детали

Номер произв ISL97636
Описание 8-Channel LED Driver
Производители Intersil Corporation
логотип Intersil Corporation логотип 

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ISL97636 Даташит, Описание, Даташиты
®
Data Sheet
May 9, 2008
ISL97636
FN6570.0
8-Channel LED Driver
The ISL97636 is an integrated power LED driver that
controls 8 channels of LED current for LCD backlight
applications. The ISL97636 is capable of driving typically 72
(8x9) pieces of 3.5V/30mA or 80 (8x10) pieces of
3.2V/20mA LEDs. The ISL97636’s contains 8 channels of
voltage controlled current sources with typical currents
matching of ±1%, which compensate for the non-uniformity
effect of forward voltages variance in the LED stacks. To
minimize the voltage headroom and power loss in the typical
multi-strings operation, the ISL97636 features a dynamic
headroom control that monitors the highest LED forward
voltage string and uses its feedback signal for output
regulation.
The LED brightness can be pulse width modulated with an
applied PWM signal from DC to audio noise free 20kHz.
The ISL97636 features extensive protection functions that
include string open and short circuit detections, OVP, OTP,
thermal shutdown and an optional input overcurrent
protection with master fault disconnect switch.
Available in the 24 Ld 4mmx4mm QFN, the ISL97636
operates from -40°C to +85°C with input voltage ranges from
6V to 24V for high LEDs count applications.
Ordering Information
PART
NUMBER
(Note)
PART
MARKING
PACKAGE
(Pb-Free)
PKG.
DWG. #
ISL97636IRZ* 976 36IRZ 24 Ld 4x4 QFN L24.4x4D
*Add “-T” or “-TK” suffix for tape and reel. Please refer to TB347 for
details on reel specifications
NOTE: These Intersil Pb-free plastic packaged products employ
special Pb-free material sets; molding compounds/die attach
materials and 100% matte tin plate PLUS ANNEAL - e3 termination
finish, which is RoHS compliant and compatible with both SnPb and
Pb-free soldering operations. Intersil Pb-free products are MSL
classified at Pb-free peak reflow temperatures that meet or exceed
the Pb-free requirements of IPC/JEDEC J STD-020.
Features
• 8 Channels
• 6V to 24V Input
• 34.5V Output Max
• Drive Maximally 72 (3.5V/30mA each) or 80 (3.2V/20mA
each) LEDs
• Current Matching ±1% Typ
• Dynamic Headroom Control
• PWM Signal up to 20kHz Dimming
• Protections
- String Open Circuit Detection
- String Short Circuit Detection with Selectable Thresholds
- Over-Temperature Protection
- Overvoltage Protection
- Optional Input Overcurrent Protection w/Disconnect SW
• 1.2MHz Switching Frequency
• 24 Ld 4mmx4mm QFN Package
• Pb-Free (RoHS compliant)
Applications
• Notebook Displays LED Backlighting
• LCD Monitor LED Backlighting
• Automotive Displays LED Backlighting
• Automotive or Traffic Lighting
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. 2008. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.









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ISL97636 Даташит, Описание, Даташиты
Typical Application Circuit
VBL+ = 6V TO 24V
ISL97636
VOUT = 34.5V, 30mA PER STRING
ISL97636
21 FAULT
LX 19
LX 20
23 VIN
OVP 16
24 VDC PGND 17
PGND 18
22 COMP IIN0 15
6 PWMI/EN IIN1 14
11 RSET
IIN2 13
IIN3 12
5 GND
IIN4 10
IIN5 9
IIN6 8
IIN7 7
2 FN6570.0
May 9, 2008









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ISL97636 Даташит, Описание, Даташиты
Block Diagram
VBL+ = 6V TO 24V
ISL97636
34.5V, 30mA PER STRING
(8 x 9 = 72 LEDS)
VIN
VDC
REG
OSC AND
RAMP
COMP
FAULT
O/P SHORT
FAULT DETECT
Σ =0
IMAX ILIMIT
LOGIC
FET
DRIVER
LX
OVP
PGND
COMP
RSET
GND
PWMI/EN
GM
AMP
REFERENCE
GENERATOR
HIGHEST VF
STRING
DETECT
+
-
FAULT DETECT
ISL97636
+
-
PWM
GENERATOR
PWM/OC/SC
OC, SC
DETECT
IIN0
IIN7
OC, SC
DETECT
FAULT DETECT
TEMP
SENSOR
+
-
FAULT/DETECT
FIGURE 1. ISL97636 BLOCK DIAGRAM
3 FN6570.0
May 9, 2008










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