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PDF ISL97686 Data sheet ( Hoja de datos )
| Número de pieza | ISL97686 | |
| Descripción | 4-Channel LED Driver | |
| Fabricantes | Intersil | |
| Logotipo |  |
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4-Channel LED Driver with Independent Channel
Control for Dynamic Dimming
ISL97686
The ISL97686 is a PWM controlled LED driver that supports
4 channels of LED current, for Monitor and TV LCD backlight
applications. It is capable of driving 160mA per channel from a
9V to 32V input supply, with current sources rated up to 75V
absolute maximum.
The ISL97686’s current sources achieve typical current matching
to ±1%, while dynamically maintaining the minimum required
VOUT necessary for regulation. This adaptive scheme
compensates for the non-uniformity of forward voltage variance
in the LED strings.
The ISL97686 dimming can be controlled by a high speed SPI
interface for independent channel control for dynamic dimming
function synthesized on chip at 10-bit resolution.
The ISL97686 has an advanced dynamic headroom control
function, which monitors the highest LED forward voltage string,
and regulates the output to the correct level to minimize power
loss. This proprietary regulation scheme also allows for
extremely linear PWM dimming from 0.02% to 100%. The LED
current can also be switched between two current levels, giving
support for 3D applications. The ISL97686 incorporates
extensive protections of string open and short circuit detections,
OVP, and OTP
Related Literature
• See Application note for “ISL97686IBZ_EVALZ” for SOIC
Application
Features
• 4 x 160mA, 75V Rated Channels with Integrated Channel
Regulation FETs
• Channels can be Ganged for High Current
- 2 x 350mA
- 1 x 700mA
• 9V~32V Input Voltage
• Dimming Modes:
- Independent Channel Dimming Control with SPI
- PWM Dimming with Adjustable Output Frequency
- 10-bit Dimming Resolution
- VSYNC Mode
• 2 Selectable Current Levels for 3D Applications
• Current Matching of ±1%
• Integrated Fault Protection Features such as String Open
Circuit Protection, String Short Circuit Protection, Overvoltage
Protection, and Over-Temperature Protection
• 28 Ld 5x5mm TQFN and 28 Ld 300mil SOIC Packages Available
Applications
• Monitor/TV LED Backlighting
www.DataSheet.co.kr
• General/Industrial/Automotive Lighting
VIN: 9V~32V
Fuse
VIN
VDC
VLOGIC
EN
CLK
SDI
SDO
/CS
EN_VSYNC
CSEL
ISET1
ISET2
OSC
PWM_SET/PLL
SLEW
GD
CS
PGND
COMP
OVP
CH1
CH2
CH3
CH4
D1
Q1
RSENSE
160mA MAX PER STRING
FIGURE 1. ISL97686 APPLICATION DIAGRAM
110
100
90
80
70
60
50
40
30
20
10
0
0
I_CH2
I_CH3
I_CH1
I_CH4
20 40 60 80
DIMMING DUTY CYCLE (%)
FIGURE 2. PWM DIMMING LINEARITY
100
April 23, 2012
FN7953.0
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. 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.
Datasheet pdf - http://www.DataSheet4U.net/
1 page  
ISL97686
Table of Contents
Absolute Maximum Ratings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Thermal Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Operating Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Electrical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Typical Performance Curves. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Theory of Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
PWM Boost Converter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
OVP and VOUT. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Current Matching and Current Accuracy. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Dynamic Headroom Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Dimming Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
LED DC Current Setting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
PWM Dimming Frequency Adjustment. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
VOUT Control when LEDs are Off. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Switching Frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
5V and 2.4V Low Dropout Regulators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Soft-Start and Boost Current Limit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Fault Protection and Monitoring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Short Circuit Protection (SCP) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Open Circuit Protection (OCP) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Undervoltage Lock-out . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Over-Temperature Protection (OTP) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Shutdown . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Component Selections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Input Capacitor. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Inductor. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Output Capacitors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Channel Capacitor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .www.DataSheet.co.kr . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Schottky Diode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
High Current Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
PCB Layout Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Two Layers PCB Layout with TQFN Package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
General Power PAD Design Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
One Layer PCB Layout with SOIC Package. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Revision History . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Products . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Package Outline Drawing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
5 FN7953.0
April 23, 2012
Datasheet pdf - http://www.DataSheet4U.net/
5 Page 
ISL97686
This is typically used in 3D systems to provide a higher current
level in 3D modes, but is not restricted to this application. CSEL
can be switched in operation and updates immediately in direct
PWM mode, and at the start of the next PWM dimming cycle in
other modes.
LED DC DIMMING
It is possible to control the LED current by applying a DC voltage
VDIM to the ISET1/2 pin via a resistor as in Figure 17.
ISET
VISET: 1.21V
RISET
RDIM
VDIM
FIGURE 17. LED CURRENT CONTROL WITH VDIM
If the VDIM is above VISET 1.21V, the brightness will reduce, and
vice versa. In this configuration, it is important that the control
voltage be set to the maximum brightness (minimum voltage)
level when the ISL97686 is enabled, even if the LEDs are not lit
at this point. This is necessary to allow the chip to calibrate to the
maximum current level that will need to be supported.
Otherwise, on-chip power dissipation will be higher at current
levels above the start-up level. Dimming with this technique
should be limited to a minimum of 10~20% brightness, as LED
current accuracy is increasingly degraded at lower levels.
PWM Dimming Frequency Adjustment
The dimming frequencies of serial interface and ACTL modes are
set by an external resistor at the PWM_SET pin, as shown in
Equation 3:
fPWM
=
-(--1---.--6---6----5---)---×---1---0---7-
RPWMSET
(EQ. 3)
where fPWM is the desirable PWM dimming frequency and
RPWMSET is the setting resistor.
SPI INTERFACE
ISL97686 has an SPI interface for the daisy chain configuration
of a single controller and multiple LED drivers in Figure 18. The
master can control the particular channels of multiple LED
drivers with sharing 4 wires, SDI, SDO, CLK, and CS. Each
serialized dimming data can be encoded 10-bit resolution and
transferred to each driver ICs only at CS pin low period. The LED
driver will start particular channel dimming after loading the
dimming data when the CS level back to high.
SSPPI I
MAMSaTsEteRr
#1
SDI SDO
CS CLK
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SDI
#2
SDO
CS CLK
#3
SDI SDO
CS CLK
CS
SDI
(FIRST CHIP)
CH 1 CH 1 CH 1
MSB MSB-1 MSB-2
CH 4 CH 4 CH 4
LSB+2 LSB+1 LSB
CLK
SDO
(LAST CHIP)
CH 1 CH 1 CH 1
MSB MSB-1 MSB-2
CH 4 CH 4 CH 4
LSB+2 LSB+1 LSB
FIGURE 18. SPI INTERFACE AND CONTROL TIMING
DIMMING DATA LATCHED
11
FN7953.0
April 23, 2012
Datasheet pdf - http://www.DataSheet4U.net/
11 Page | ||
| Páginas | Total 23 Páginas | |
| PDF Descargar | [ Datasheet ISL97686.PDF ] | |
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