参数资料
型号: A8502KLPTR-T
厂商: Allegro Microsystems Inc
文件页数: 21/35页
文件大小: 0K
描述: IC LED DVR WHITE MULTI 16-TSSOP
标准包装: 8,000
拓扑: PWM,升压(升压)
输出数: 2
内部驱动器:
类型 - 主要: 车载,背光
类型 - 次要: 白色 LED
频率: 580kHz ~ 2MHz
电源电压: 5 V ~ 40 V
安装类型: 表面贴装
封装/外壳: 16-TSSOP(0.173",4.40mm)裸露焊盘
供应商设备封装: 16-TSSOP-EP
包装: 带卷 (TR)
工作温度: -40°C ~ 125°C
A8502
Boost switch overcurrent protection
Wide Input Voltage Range, High Efficiency
Fault Tolerant LED Driver
rent limit is set above the cycle-by-cycle current limit to protect
The boost switch is protected with cycle-by-cycle current limiting
set at a minimum of 3.0 A. There is also a secondary current limit
that is sensed on the boost switch. When detected this current
the switch from destructive currents when the boost inductor is
shorted. Various boost switch overcurrent conditions are shown in
figures 25 through 27.
limit immediately shuts down the A8502. The level of this cur-
SW node
C1
SW node
C1
C2
I L
V OUT
C2
I L
V OUT
PWM/EN
C3
PWM/EN
C3
C4
t
C4
t
Figure 25. Normal operation of the switch node (SW); inductor current
(I L ) and output voltage (V OUT ) for 9 series LEDs in each of 2 strings
configuration; shows SW node (ch1, 20 V/div.), inductor current, I L
(ch2, 1 A/div.), V OUT (ch3, 10 V/div.), and PWM/EN (ch4, 5 V/div.),
time = 2 μ s/div.
Figure 26. Cycle-by-cycle current limiting; inductor current (yellow trace, I L ),
note reduction in output voltage as compared to normal operation with the
same configuration (figure 23); shows SW node (ch1, 20 V/div.), inductor
current, I L (ch2, 1 A/div.), V OUT (ch3, 10 V/div.), and PWM/EN (ch4,
5 V/div.), time = 2 μ s/div.
PWM/EN
C1
FAULT
C2
SW node
C3
I L
C4
t
Figure 27. Secondary boost switch current limit; when this limit is hit, the
A8502 immediately shuts down; shows PWM/EN (ch1, 5 V/div.), ˉFˉ ˉA ˉUˉˉLˉ ˉTˉ
(ch2, 5 V/div.), SW node (ch3, 50 V/div.), and inductor current, I L (ch4,
2 A/div.), time = 100 ns/div.
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
21
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