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A8509

更新时间： 2024-11-09 12:51:19
品牌 Logo 应用领域
急速微 - ALLEGRO /
页数 文件大小 规格书
28页 1132K
描述
Wide Input Voltage Range, High Efficiency

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中文翻译

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A8509 数据手册

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A8509  
Wide Input Voltage Range, High Efficiency  
4-Channel Fault Tolerant LED Driver  
Description  
Features and Benefits  
TheA8509isamulti-outputwhiteLEDdriverforbacklighting  
LCD panels. It integrates a current-mode boost controller and  
four individual current sinks.  
• Four integrated high current sinks for LED strings; can be  
tied together for even higher currents  
• Fixed frequency current mode control with integrated gate  
driver/boost controller; powerful gate driver to drive an  
external N-channel MOSFET allows significant scaling  
capability on the number of LEDs per string  
• Parallel operation with one boost controller (master) and  
up to three additional slave controllers; can run up to  
16 strings of LEDs while populating only a single master  
boost regulator  
The boost controller architecture allows for significant scaling  
of boost voltage to optimize the solution for the required  
number of LEDs per string. The FSET/SYNC pin either sets  
the required boost switching frequency or synchronizes the  
value in the range of 300 to 800 kHz.  
The LED sink current value is set by an external ISET resistor  
(see figure 1). The four LED sinks can also be combined to  
achieve even higher current per LED string.  
• Active current sharing between LED strings for  
0.7% accuracy and 0.8% matching  
• Wide input voltage range: 9 to 40 V  
• Internal bias supply for single-supply operation (typically  
VIN = 12 or 24 V)  
• Separate Enable and PWM pins as interface for Enable  
and PWM Dimming functions  
• Fset/Sync function to either set the boost converter  
switching frequency or synchronize at up to 800 kHz  
• Protection Features  
The A8509 provides protection against output shorts and  
overvoltage, open or shorted LED pins, and overtemperature.  
A dual-level, pulse-by-pulse current limit function provides  
soft start and protects the external current switch against  
high current overloads. As an option, the A8509 can drive an  
¯¯¯¯¯¯¯¯¯  
external P-FET interfaced to the FAULT pin to disconnect the  
input supply from the system in the event of short-to-ground  
in the boost converter.  
▫ Open or shorted LED pin protection  
Package options are 24-pin TSSOP (suffix LP) and SOICW  
(LB) packages. The TSSOP has an exposed thermal pad, and  
theSOICWhasfourinterally-fusedpins, forenhancedthermal  
dissipation. The Both packages are lead (Pb) free, with 100%  
matte tin leadframe plating.  
▫ Open Schottky protection  
▫ Pulse-by-pulse current limit  
▫ Overtemperature protection (OTP)  
Packages  
(Not to scale)  
24-pin TSSOP with  
24-pin SOICW with  
Exposed Thermal Pad  
Four Internally-Fused Pins  
(LP package)  
(LB package)  
Typical Application  
L1  
CIN  
D1  
VOUT  
V
IN  
RISET Value versus LED Current  
30.00  
VDD  
R1  
COUT  
ROVP  
25.00  
Q1  
GATE SENP  
RSENSE  
20.00  
VIN  
SENN  
OVP  
15.00  
FAULT  
10.00  
LED1  
LED2  
LED3  
LED4  
PWM  
EN  
VDR  
VDD  
5.00  
A8509  
60 100 140 180 220 260 300  
I
(mA)  
LED  
FSET/SYNC  
ISET  
COMP  
PAD  
RFSET  
RISET  
Figure 1. Typical application circuit  
showing 4 channels of LEDs; RZ-CZ  
optional (component list shown in the  
Typical Applications section)  
CDR  
CDD  
RZ  
CZ CP  
MODE  
AGND PGND  
A8509-DS  
1234567...28

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