参数资料
型号: A8502KLPTR-T
厂商: Allegro Microsystems Inc
文件页数: 20/35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
Wide Input Voltage Range, High Efficiency
Fault Tolerant LED Driver
pin exceeds the device safe operating voltage rating, the A8502
disables and remains latched. To clear this fault, the IC must be
shut down either by using the PWM/EN signal or by going below
the UVLO threshold on the VIN pin. Figure 23 illustrates this.
As soon as the switch node voltage (SW) exceeds 60 V, the IC
shuts down. Due to small delays in the detection circuit, as well
Open diode
condition detected
as there being no load present, the switch node voltage will rise
above the trip point voltage.
Figure 24 illustrates when the A8502 is being enabled during an
open diode condition. The IC goes through all of its initial LED
detection and then tries to enable the boost, at which point the
open diode is detected.
PWM
C1
SW node
C2
V OUT
I OUT
C3
C4
t
Figure 23. OVP protection in an open Schottky diode event, while the IC is
in normal operation; shows PWM (ch1, 5 V/div.), SW node (ch2, 50 V/div.),
V OUT (ch3, 20 V/div.), and I OUT (ch4, 200 mA/div.), time = 1 μ s/div.
PWM
Open diode
condition detected
C1
SW node
C2
V OUT
C3
I OUT
C4
t
Figure 24. OVP protection when the IC is enabled during an open diode
condition; shows PWM (ch1, 5 V/div.), SW node (ch2, 50 V/div.), V OUT
(ch3, 10 V/div.), and I OUT (ch4, 200 mA/div.), time = 500 μ s/div.
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
20
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