参数资料
型号: A8509GLPTR-T
厂商: Allegro Microsystems Inc
文件页数: 17/28页
文件大小: 0K
描述: IC LED DVR WHITE 4X120MA 24TSSOP
标准包装: 8,000
拓扑: PWM,SEPIC,升压(升压)
输出数: 4
内部驱动器:
类型 - 主要: 背光
类型 - 次要: 白色 LED
频率: 300kHz ~ 800kHz
电源电压: 9 V ~ 40 V
安装类型: 表面贴装
封装/外壳: 24-TSSOP(0.173",4.40mm)裸露焊盘
供应商设备封装: 24-TSSOP 裸露焊盘
包装: 带卷 (TR)
工作温度: -40°C ~ 105°C
A8509
Wide Input Voltage Range, High Efficiency
4-Channel Fault Tolerant LED Driver
The VDR circuit provides power to the gate driver of the A8509.
For VDR the decoupling capacitor value should fall in the range
0.47 to 1 μ F. A 1 μ F capacitor is recommended.
Shutdown
If the EN pin is pulled low, the IC will shut down immediately.
Fault protection during operation
The A8509 device constantly monitors the state of the system to
determine if any fault conditions occur during normal operation.
The response to a triggered fault condition is summarized in
1
table 1. The possible fault conditions that the part can detect are:
? Open LED pin
? Shorted inductor with second level switch current protection
? VOUT short-to-ground
? ISET pin short-to-ground
? FSET pin short-to-ground
? Shorted LED
? Open Schottky diode
? Short Schottky diode protection with second level switch cur-
rent protection
? Thermal shutdown (TSD)
? Overvoltage protection (OVP)
V OUT
C1
C2
2
Soft start and
power-up
I IN
C4
FAULT
C3
LED detection
period
V GATE(PMOS)
t
Figure 31. Input disconnect switch power-up: (1) V OUT charges via 10 k Ω
resistor, (2) I IN current spike from charging COUT when the PMOS is
enabled; shows V OUT (ch1, 20 V/div.), I IN (ch2, 2 A/div.), ˉFˉ ˉA ˉUˉˉLˉ ˉTˉ (ch3,
5 V/div.), and PMOS device V GATE (ch4, 5 V/div.), t = 2 ms/div.
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
17
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