参数资料
型号: A8508GLPTR-T
厂商: Allegro Microsystems Inc
文件页数: 16/28页
文件大小: 0K
描述: IC LED DVR WHITE 8X120MA 24TSSOP
标准包装: 8,000
拓扑: PWM,SEPIC,升压(升压)
输出数: 8
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
A8508
Wide Input Voltage Range, High Efficiency
8-Channel Fault Tolerant LED Driver
The waveforms in figure 29 show the operation of the disconnect
feature.
LED short detect
All LEDx pins are rated for 55 V, thus allowing LEDx pin-to-
VOUT short protection in case of a connector short. Any LEDx
pin that has a voltage exceeding V LEDSC will be removed from
operation. This is to prevent the IC dissipating too much power
by having a large voltage present on the LEDx pins.
V OUT
Input UVLO
When V IN rises above the UVLO threshold (V UVLO(th) ), the
A8508 is enabled. It is disabled when V IN falls below V UVLO(th)
– V UVLO(hys) for more than 2 μ s. This lag is to avoid shutdown
because of momentary glitches in the power supply.
VDD and VDR
The VDD pin provides the regulated bias supply for the internal
circuits. A capacitor with a value in the range 0.1 to 1 μ F should
be used to decouple the internal analog and digital circuitry.
V OUT
C1
Output short
V EN
C2
I IN
FAULT
occurrence
C2
C1
C3
I OUT
C3
C4
I IN
V GATE(PMOS)
C4
V LEDx
V LEDSC is detected
t
Figure 29. Input disconnect switch shutdown during an output short
condition; shows V OUT (ch1, 20 V/div.), I IN (ch2, 10 A/div.), ˉFˉ ˉA ˉUˉˉLˉ ˉTˉ (ch3,
5 V/div.), and PMOS device V GATE (ch4, 5 V/div.), t = 50 μ s/div.
t
Figure 30. Typical shorted LED: when voltage exceeds V LEDSC , the LED
is disabled and remains disabled until either the EN pin is toggled or the
power cycled; shows V OUT (ch1, 20 V/div.), V EN (ch2, 5 V/div.), I OUT (ch3,
0.5 A/div.), and V LEDx (ch4, 10 V/div.), t = 10 μ s/div.
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
16
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