参数资料
型号: A8510GECTR-T
厂商: Allegro Microsystems Inc
文件页数: 11/33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
Wide Input Voltage Range, High Efficiency
Fault Tolerant LED Driver
All unused pins should be connected with a 4.75 k Ω resistor to
GND, 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.
A8510
LED1
LED2
LED3
LED4
LED5
LED6
A8510
LED1
LED2
LED3
LED4
LED5
LED6
If an LEDx pin is shorted to ground the A8510 will not proceed
with soft start until the short is removed from the LEDx pin. This
GND
LED7
LED8
GND
LED7
LED8
prevents the A8510 from powering-up and putting an uncon-
trolled amount of current through the LEDs. The various detect
scenarios are presented in figures 4A and 4B.
C1
4.75 k Ω
Figure 5. Channel select setup: (left) channel LED8 not used,
(right) using all channels.
LED1-7
LED detection period
C2
LED8
C3
ISET
C4
EN/PWM
t
4A. Example with LED8 pin not being used; f SW is 2 MHz, the detect voltage
is about 150 mV; shows LED1-7 (ch1, 500 mV/div.), LED8 (ch2, 500 mV/div.),
ISET (ch3, 1 V/div.), and EN/PWM (ch4, 5 V/div.) pins, t = 500 μ s/div.
Short removed
Pin shorted
LED1
C1
LED2
C2
ISET
C3
C4
EN/PWM
t
4B. Example with one LED shorted to GND. 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 EN/PWM (ch4, 5 V/div.) pins, t = 1 ms/div.
.
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
11
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