参数资料
型号: A8502KLPTR-T
厂商: Allegro Microsystems Inc
文件页数: 12/35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
frequency, as shown in the following table:
Wide Input Voltage Range, High Efficiency
Fault Tolerant LED Driver
Switching Frequency
Detection Time
LED1
(MHz)
2
1
0.800
0.600
(ms)
1.5 to 2
3 to 4
3.75 to 5
5 to 6.7
C1
C2
C3
LED2
LED detection period
ISET
The LED pin detection voltage thresholds are as follows:
LED Pin Voltage
<70 mV
LED Pin Status
Short-to-ground
Action
Power-up is halted
C4
PWM/EN
150 mV
325 mV
Not used
LED pin in use
LED removed from operation
None
t
4B. Example with LED2 pin not being used; the detect voltage is
about 150 mV; shows LED1 (ch1, 500 mV/div.), LED2 (ch2, 500 mV/div.),
All unused pins should be connected with a 1.54 k Ω resistor to
ISET (ch3, 1 V/div.), and PWM/EN (ch4, 5 V/div.) pins, time = 500 μ s/div.
ground, as shown in figure 5. The unused pin, with the pull-down
resistor, will be taken out of regulation at this point and will not
contribute to the boost regulation loop.
Short removed
LED1
Pin shorted
LED1
C1
C2
C3
LED2
ISET
LED detection period
C1
C2
C3
LED2
ISET
C4
PWM/EN
C4
PWM/EN
t
4A. An LED detect occurring when both LED pins are selected to be used;
shows LED1 (ch1, 500 mV/div.), LED2 (ch2, 500 mV/div.), ISET (ch3,
1 V/div.), and PWM/EN (ch4, 5 V/div.) pins, time = 500 μ s/div.
t
4C. Example with one LED shorted to ground. The IC will not proceed with
power-up until the shorted LED pin is released, at which point the LED is
checked to see if it is being used; shows LED1 (ch1, 500 mV/div.), LED2 (ch2,
500 mV/div.), ISET (ch3, 1 V/div.), and PWM/EN (ch4, 5 V/div.) pins,
time = 1 ms/div.
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
12
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