参数资料
型号: A8515GLPTR-T
厂商: Allegro Microsystems Inc
文件页数: 20/34页
文件大小: 0K
描述: IC LED DVR WHT/RGB BKLGT 16TSSOP
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: 背光
类型 - 次要: 白色 LED
频率: 600kHz ~ 2.5MHz
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 ~ 105°C
A8515
Boost switch overcurrent protection
Wide Input Voltage Range, High Efficiency
Fault Tolerant LED Driver
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
limit immediately shuts down the A8515. The level of this cur-
C1
SW node
rent limit is set above the cycle-by-cycle current limit to protect
the switch from destructive currents when the boost inductor is
shorted. Various boost switch overcurrent conditions are shown in
figures 25 through 27.
SW node
C1
C2
I L
I L
V OUT
EN/PWM
C2
C3
V OUT
EN/PWM
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.), I L (ch2, 1 A/div.), V OUT
(ch3, 10 V/div.), and EN/PWM (ch4, 5 V/div.), 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 25); shows SW node (ch1, 20 V/div.), I L
(ch2, 1 A/div.), V OUT (ch3, 10 V/div.), and EN/PWM (ch4, 5 V/div.), 2 μ s/div.
EN/PWM
C1
FAULT
C2
C3
SW node
I L
C4
t
Figure 27. Secondary boost switch current limit; when this limit is hit, the
A8515 immediately shuts down; shows EN/PWM (ch1, 5 V/div.), V OUT
(ch2, 5 V/div.), SW node (ch3, 50 V/div.), and I L (ch4, 2 A/div.), 100 ns/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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