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PDF ISL97676 Data sheet ( Hoja de datos )
| Número de pieza | ISL97676 | |
| Descripción | 6-Channel LED Driver | |
| Fabricantes | Intersil | |
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6-Channel LED Driver with Phase Shift Control
ISL97676
The ISL97676 is an LED driver that drives 6 channels of
LED current for TFT-Display. The ISL97676 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 supply on the ISL97676 Vin pin.
The ISL97676 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 the typical multi string operation.
Intersil offers two PWM Dimming modes: The ISL97676
digitizes the incoming PWM signal and provides 8-bit
dimming. The PWM frequency is set by a resistor
providing dimming frequency between 100Hz to 30kHz.
Secondly, direct PWM mode without phase shift, where the
dimming follows the input PWM signal.
The ISL97676 features channel phase shift control to
minimize the input, output ripple characteristics and load
transients as well as spreading the light output to help
eliminate or reduce the video and audio noise interference
from the backlight driver operation.
Features
• 6 Channels
• Channel Phase Shift PWM Dimming
• Direct PWM Dimming without Phase Shift
• 4.5V to 26V Input
• 45V Output Max
• Up to 30mA LED Current per Channel
• Drive up to 78 (3.2V/20mA each) LEDs
• Current Matching of ±1.5% from 1% ~ 100% Dimming
• Dynamic Headroom Control
• Protections
- String Open/Short Circuit, VOUT Short Circuit
Overvoltage, and Over-temperature Protections
- Optional Master Fault Protection
• Selectable 600kHz or 1.2MHz Switching Frequency
• 20 Ld QFN 4mmx4mm Package
Applications
• Netbook Displays LED Backlighting
• Notebook Displays LED Backlighting
Typical Application Circuit
VIN* = 4.5~26V
VOUT = 45V*, 30mA PER STRING
ISL97676
17 FAULT
19 VIN
1 VDDIO
SW 16
OVP 14
5 NC
PGND 15
2 EN
20 PWM
3 FSW/
PhaseShift
18 COMP
13
RFPWM//
DirectPWM
FB1 12
FB2 11
FB3 10
FB4 8
FB5 7
4 ISET
FB6 6
AGND 9
*For VIN > 6V
March 12, 2010
FN7600.0
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. 2010. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.
1 page  
Table of Contents
ISL97676
www.DataSheet4U.com
Typical Application Circuit ................................................................................................................... 1
Block Diagram ..................................................................................................................................... 2
Pin Descriptions (I = Input, O = Output, S = Supply) .......................................................................... 3
Absolute Maximum Ratings ................................................................................................................. 6
Thermal Information ........................................................................................................................... 6
Operating Conditions ........................................................................................................................... 6
Electrical Specifications ....................................................................................................................... 6
Typical Performance Curves ................................................................................................................ 9
Theory of Operation........................................................................................................................... 12
PWM Boost Converter ...................................................................................................................... 12
OVP .............................................................................................................................................. 12
Enable ........................................................................................................................................... 12
Power Sequence ............................................................................................................................. 12
Current Matching and Current Accuracy ............................................................................................. 12
Dynamic Headroom Control .............................................................................................................. 12
Dimming Controls ........................................................................................................................... 12
Maximum DC Current Setting ........................................................................................................... 12
PWM Control................................................................................................................................... 13
Phase Shift Control.......................................................................................................................... 13
PWM Dimming Frequency Adjustment ................................................................................................ 14
Direct PWM Dimming ....................................................................................................................... 14
Switching Frequency........................................................................................................................ 14
Inrush Control and Soft-Start ........................................................................................................... 14
Fault Protection and Monitoring ......................................................................................................... 15
Short Circuit Protection (SCP) ........................................................................................................... 15
Open Circuit Protection (OCP) ........................................................................................................... 15
Overvoltage Protection (OVP) ........................................................................................................... 15
Undervoltage Lockout ...................................................................................................................... 15
Master Fault Protection .................................................................................................................... 15
Over-Temperature Protection (OTP)................................................................................................... 16
Components Selections .................................................................................................................... 17
Input Capacitor............................................................................................................................... 18
Inductor ........................................................................................................................................ 18
Output Capacitors ........................................................................................................................... 18
Channel Capacitor ........................................................................................................................... 18
Output Ripple ................................................................................................................................. 18
Schottky Diode ............................................................................................................................... 19
Applications....................................................................................................................................... 19
High Current Applications ................................................................................................................. 19
Revision History ................................................................................................................................ 19
Products ............................................................................................................................................ 19
Package Outline Drawing .................................................................................................................. 20
5 FN7600.0
March 12, 2010
5 Page 
ISL97676
Typical Performance Curves (Continued)
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FIGURE 13. IN-RUSH AND LED CURRENT AT VIN = 12V
FOR 6P12S AT 20mA/CHANNEL
FIGURE 14. LINE REGULATION WITH VIN CHANGE
FROM 6V TO 26V, VIN = 12V, 6P12S AT
20mA/CHANNEL
FIGURE 15. LINE REGULATION WITH VIN CHANGE
FROM 26V TO 6V FOR 6P12S AT
20mA/CHANNEL
FIGURE 16. LOAD REGULATION WITH ILED CHANGE
FROM 0% TO 100% PWM DIMMING,
VIN = 12V, 6P12S AT 20mA/CHANNEL
FIGURE 17. LOAD REGULATION WITH ILED CHANGE
FROM 100% TO 0% PWM DIMMING,
VIN = 12V, 6P12S AT 20mA/CHANNEL
11
FIGURE 18. ISL97676 SHUTS DOWN AND STOPS
SWITCHING ~ 30ms AFTER EN GOES LOW
FN7600.0
March 12, 2010
11 Page | ||
| Páginas | Total 20 Páginas | |
| PDF Descargar | [ Datasheet ISL97676.PDF ] | |
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