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A8508

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 1166K
描述
Wide Input Voltage Range, High Efficiency

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中文翻译

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A8508 数据手册

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A8508  
Wide Input Voltage Range, High Efficiency  
8-Channel Fault Tolerant LED Driver  
Description  
Features and Benefits  
TheA8508isamulti-outputwhiteLEDdriverforbacklighting  
LCD panels. It integrates a current-mode boost controller and  
eight individual current sinks.  
• Eight 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 capability with one boost controller  
(master) and up to three additional slave controllers; can  
run up to 32 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 eight 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)  
• Fset / Sync function to either set the boost converter  
switching frequency or synchronize at up to 800 kHz  
• Protection Features  
▫ Open or shorted LED pin protection  
▫ Open Schottky protection  
▫ Pulse-by-pulse current limit  
The A8508 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 A8508 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.  
TheA8508 is available in a 24-pinTSSOPpackage (suffix LP)  
with an exposed thermal pad for enhanced thermal dissipation.  
Contact factory for additional options, including: a 24-pin  
SOICW (LW) or a a 5×5 mm 28-contact QFN (ET) with  
exposed thermal pad. All packages are lead (Pb) free, with  
100% matte tin leadframe plating.  
▫ Overtemperature protection (OTP)  
(Not to scale)  
Packages  
28-contact QFN  
24-pin TSSOP with  
24-pin SOICW  
with Exposed Thermal  
Exposed Thermal Pad  
(LW package)  
Pad (ET package)  
(LP package)  
Typical Application  
L1  
CIN  
D1  
Q1  
VOUT  
V
IN  
RISET Value versus LED Current  
30.00  
VDD  
COUT  
ROVP  
25.00  
RSENSE  
20.00  
15.00  
10.00  
5.00  
R1  
VIN  
GATE SENP  
SENN  
OVP  
FAULT  
LED1  
LED2  
LED3  
LED4  
LED5  
LED6  
LED7  
LED8  
PWM  
EN  
VDR  
VDD  
30  
50  
70  
90 110 130 150  
(mA)  
A8508  
RVDR  
I
LED  
FSET/SYNC  
ISET  
COMP  
PAD  
RFSET  
RISET  
CDR  
CDD  
Figure 1. Typical application circuit  
showing 8 channels of LEDs; RZ-CZ  
optional (component list shown in the  
Typical Applications section)  
RZ  
CZ CP  
MODE  
AGND PGND  
A8508-DS, Rev. 1  
1234567...28

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