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ISL97635 PDF даташит

Спецификация ISL97635 изготовлена ​​​​«Intersil Corporation» и имеет функцию, называемую «SMBus 8-Channel LED Driver».

Детали детали

Номер произв ISL97635
Описание SMBus 8-Channel LED Driver
Производители Intersil Corporation
логотип Intersil Corporation логотип 

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ISL97635 Даташит, Описание, Даташиты
®
Data Sheet
December 22, 2008
ISL97635
FN6434.2
SMBus 8-Channel LED Driver
The ISL97635 is a digitally controlled LED driver that
controls 8 channels of LED current for LCD backlight
applications. The ISL97635 is capable of driving typically 72
(8x9) pieces of 3.5V/30mA or 80 (8x10) pieces of
3.2V/20mA LEDs. The ISL97635’s 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 ISL97635 features a dynamic headroom
control that monitors the highest LED forward voltage string
and uses its feedback signal for output regulation.
The LED dimming control can be achieved through a
SMBus, an external PWM, or a variable DC (analog light
sensor) input. SMBus controlled dimming allows 256 levels
each of PWM and DC current adjustments. The SMBus
PWM dimming frequency can be adjusted from 100Hz to
5kHz by an external capacitor. External PWM input allows up
to 20kHz audio noise free PWM dimming. The SMBus PWM
setting and an external PWMI signal can also be combined
to provide a dynamic PWM dimming that complies with
Intel’s DPST (Display Power Saving Technology)
requirement.
One or more channels can be selected sequentially in any
order, allowing scrolling in RGB LED backlighting
applications.
The ISL97635 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. The fault
conditions will be recorded in the Fault/Status register. There
are selectable short-circuit thresholds and the switching
frequency can be programmed between 600kHz and
1.2MHz.
Available in the 24 Ld 4mmx4mm QFN, the ISL97635
operates from -40°C to +85°C with input voltage ranging
from 6V to 24V.
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
• Dimming Controls
- SMBus 8-Bit PWM Current Control
- SMBus 8-Bit DC Current Control
- External PWM Input up to 20kHz Dimming
- SMBus and External PWM DPST Dimming Control
- DC-to-PWM Dimming Control
• Protections
- String Open Circuit Detection
- String Short Circuit Detection with Selectable Thresholds
- Over-Temperature Protection
- Overvoltage Protection
- Input Overcurrent Protection with Disconnect Switch
• 600kHz/1.2MHz Selectable fSW
• Selectable Channels Allows Scrolling Backlight
• 24 Ld (4mmx4mm) QFN Package
• Pb-Free (RoHS compliant)
Applications
• Notebook Displays WLED or RGB LED Backlighting
• LCD Monitor LED Backlighting
• Automotive Displays LED Backlighting
• Automotive or Traffic Lighting
Ordering Information
PART NUMBER
PART
(Note)
MARKING
ISL97635IRZ* 976 35IRZ
PACKAGE
(Pb-free)
24 Ld 4x4 QFN
PKG.
DWG. #
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.
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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ISL97635 Даташит, Описание, Даташиты
Typical Application Circuit
VBL+ = 6V TO 24V
ISL97635
VOUT = 34.5V, 30mA PER STRING
ISL97635
21 FAULT
LX 19
LX 20
23 VIN
OVP 16
24 VDC PGND 17
PGND 18
22 COMP IIN0 15
1 SMBCLK IIN1 14
2 SMBDAT IIN2 13
6 PWMI/EN IIN3 12
4 PWMO IIN4 10
11 RSET IIN5 9
IIN6 8
3 FPWM IIN7 7
5 GND
2 FN6434.2
December 22, 2008









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ISL97635 Даташит, Описание, Даташиты
ISL97635
Block Diagram
VBL+ = 6V TO 24V
34.5V, 30mA PER STRING
(8x9 = 72 WHITE LEDS)
VIN
VDC
REG
OSC AND
RAMP
COMP
fPWM LED PWM
CONTROL
FAULT
ISL97635
FAULT/STATUS
REGISTER
Σ =0
LOGIC
FET
DRIVER
IMAX ILIMIT
LX
OVP
PGND
COMP
RSET
GND
SMBCLK
SMBDAT
PWMI
PWMO
GM
AMP
REFERENCE
GENERATOR
+
-
HIGHEST VF
STRING
DETECT
+
-
SMBUS
INTERFACE
REGISTERS
PWM BRIGHTNESS CONTROL
DEVICE CONTROL
FAULT/STATUS
PWM/OC/SC
IDENTIFICATION
AM
DC BRIGHTNESS CONTROL
CONFIGURATION
OC, SC
DETECT
IIN0
IIN7
OC, SC
DETECT
FAULT/STATUS
REGISTER
TEMP
SENSOR
+
-
FAULT/STATUS
REGISTER
FIGURE 1. ISL97635 BLOCK DIAGRAM
3 FN6434.2
December 22, 2008










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