参数资料
型号: A8510GECTR-T
厂商: Allegro Microsystems Inc
文件页数: 19/33页
文件大小: 0K
描述: IC LED DRVR BCKLGHT/WHT 26QFN-EC
标准包装: 1
拓扑: PWM,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: 600kHz ~ 2.25MHz
电源电压: 5 V ~ 40 V
安装类型: 表面贴装
封装/外壳: 26-WFQFN 裸露焊盘
供应商设备封装: 26-QFN/MLP-EP(4x4)
包装: 标准包装
工作温度: -40°C ~ 105°C
其它名称: 620-1385-6
A8510
Boost switch overcurrent protection
Wide Input Voltage Range, High Efficiency
Fault Tolerant LED Driver
in figures 25 through 27.
The boost switch is protected with cycle-by-cycle current
limiting set at a minimum of 3.0 A. There is also a secondary cur-
rent limit that is sensed on the boost switch. When detected this
current limit immediately shuts down the A8510. The level of this
current limit is set above the cycle-by-cycle current limit to pro-
tect the switch from destructive currents when the boost inductor
is shorted. Various boost switch overcurrent conditions are shown
I L
C1
C2
Input overcurrent protection and disconnect switch
The primary function of the input disconnect switch is to protect
the system and the device from catastrophic input currents during
a fault condition. The external circuit implementing the discon-
nect is shown in figure 28. If the input disconnect switch is not
used, the VSENSE pin must be tied to VIN and the VGATE pin
must be left open.
I L
SW node
C1
SW node
C2
V OUT
V OUT
C3
EN/PWM
C3
EN/PWM
C3
t
Figure 25. Normal operation of the switch node (SW); inductor current
(I L ) and output voltage (V OUT ) for 12 series LEDs in each of 8 strings
configuration; shows I L (ch1, 500 mA/div.), SW node (ch2, 20 V/div.), V OUT
(ch3, 20 V/div.), and EN/PWM (ch4, 5 V/div.), t = 1 μ s/div.
C4
t
Figure 26. Cycle-by-cycle current limiting; inductor current (IL), note
reduction in output voltage as compared to normal operation with the
same configuration (figure 25); shows IL (ch1, 1 A/div.), SW node (ch2, 20
V/div.), VOUT (ch3, 10 V/div.), and EN/PWM (ch4, 5 V/div.), t = 2 μ s/div.
EN/PWM
C1
FAULT
C2
SW node
C3
I L
C4
t
Figure 27. Secondary boost switch current limit; when this limit is hit, the
A8510 immediately shuts down; shows EN/PWM (ch1, 5 V/div.), ˉFˉ ˉA ˉUˉˉLˉ ˉTˉ
(ch2, 5 V/div.), SW node (ch3, 50 V/div.), and I L (ch4, 2 A/div.), t = 200 ns/div.
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
19
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