|
|
PDF ISL97675 Data sheet ( Hoja de datos )
| Número de pieza | ISL97675 | |
| Descripción | 4-Channel LED Driver | |
| Fabricantes | Intersil Corporation | |
| Logotipo |  |
|
Hay una vista previa y un enlace de descarga de ISL97675 (archivo pdf) en la parte inferior de esta página. Total 20 Páginas | ||
|
No Preview Available !
www.DataSheet4U.com
4-Channel LED Driver with Phase Shift Control
ISL97675
The ISL97675 is an LED driver that drives 4 channels of
low power LEDs from 4.5V to 26V input and up to 45V
output.
The ISL97675 compensates for non-uniformity of the
forward voltage drops in the LED strings with its 4 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.
The ISL97675 offers two PWM Dimming modes: The part
digitizes the incoming 100Hz to 30kHz PWM signal and
provides 8-bit PWM dimming with phase shift function.
Another mode is direct PWM mode without phase shift,
where the dimming frequency follows the input PWM
signal and the minimum on time can be as short as 350ns.
The ISL97675 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
• 4 x 30mA Channels
• 45V Output Max
• 4.5V to 26V Input
• Channel Phase Shift PWM Dimming with 8-bit
resolution
• 0.007% Direct PWM dimming at 200Hz
• 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*(see page 19)
• Netbook Displays LED Backlighting
• Notebook Displays LED Backlighting
Typical Application Circuit
VIN* = 4.5V~26V
VOUT = 45V max*
ILED = 30mA PER STRING
ISL97675
17 FAULT
19 VIN
1 VDDIO
SW 16
OVP 14
PGND 15
3 FSW/Phase Shift
2 EN
20 PWM
18 COMP
FB1 12
FB2 11
13 RFPWM/DirectPWM
FB3 7
4 ISET
FB4 6
8 AGND
9 AGND
* VIN ≥ 6V
May 19, 2010
FN7630.0
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  
ISL97675
Table of Contents
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).................................................................................................... 15
Components Selections ..................................................................................................................... 17
Input Capacitor................................................................................................................................ 17
Inductor ......................................................................................................................................... 18
Output Capacitors ............................................................................................................................ 18
Channel Capacitor ............................................................................................................................ 18
Output Ripple .................................................................................................................................. 18
Schottky Diode ................................................................................................................................ 18
Applications....................................................................................................................................... 19
High Current Applications .................................................................................................................. 19
Revision History ................................................................................................................................ 19
Products ............................................................................................................................................ 19
Package Outline Drawing .................................................................................................................. 20
5 FN7630.0
May 19, 2010
5 Page 
ISL97675
Typical Performance Curves (Continued)
www.DataSheet4U.com
FIGURE 13. LINE REGULATION WITH VIN CHANGE
FROM 6V TO 26V, VIN = 12V, 4P12S AT
20mA/CHANNEL
FIGURE 14. LINE REGULATION WITH VIN CHANGE
FROM 26V TO 6V FOR 4P12S AT
20mA/CHANNEL
FIGURE 15. LOAD REGULATION WITH ILED CHANGE
FROM 0% TO 100% PWM DIMMING,
VIN = 12V, 4P12S AT 20mA/CHANNEL
FIGURE 16. LOAD REGULATION WITH ILED CHANGE
FROM 100% TO 0% PWM DIMMING,
VIN = 12V, 4P12S AT 20mA/CHANNEL
FIGURE 17. ISL97675 SHUTS DOWN AND STOPS SWITCHING ~ 30ms AFTER EN GOES LOW
11 FN7630.0
May 19, 2010
11 Page | ||
| Páginas | Total 20 Páginas | |
| PDF Descargar | [ Datasheet ISL97675.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| ISL97671 | 6-Channel SMBus/I2C or PM Dimming LED Driver |  Intersil |
| ISL97671A | 6-Channel SMBus/I2C or PWM Dimming LED Driver | Intersil |
| ISL97672 | 6-Channel LED Driver | Intersil |
| ISL97672A | 6-Channel LED Driver | Intersil |
| Número de pieza | Descripción | Fabricantes |
| SLA6805M | High Voltage 3 phase Motor Driver IC. |
 Sanken |
| SDC1742 | 12- and 14-Bit Hybrid Synchro / Resolver-to-Digital Converters. |
 Analog Devices |
|
DataSheet.es es una pagina web que funciona como un repositorio de manuales o hoja de datos de muchos de los productos más populares, |
| DataSheet.es | 2020 | Privacy Policy | Contacto | Buscar |