参数资料
型号: A8510GECTR-T
厂商: Allegro Microsystems Inc
文件页数: 15/33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
APWM pin
Wide Input Voltage Range, High Efficiency
Fault Tolerant LED Driver
The APWM pin is used in conjunction with the ISET pin. This is
APWM
A8510
a digital signal pin that internally adjusts the ISET current. The
typical input signal frequency is between 20 kHz and 1 MHz. The
duty cycle of this signal is inversely proportional to the percent-
age of current that is delivered to the LEDs (figure 14). As an
example, a system that delivers a full LED current of 40 mA per
R ISET
ISET
EN/PWM
ISET
Current
Mirror
APWM ISET
Current
Adjust
LED
Driver
LED would deliver 20 mA of current per LED when an APWM
signal is applied with a duty cycle of 50%. When this pin is not
used it should be tied to GND.
To use this pin for a trim function, the user should set the maxi-
mum output current to a value higher than the required current by
at least 5%. The LED ISET current is then trimmed down to the
Figure 13. Simplified block diagram of the APWM ISET block.
25
20
5V
200 kHz
40
30
15
10
1.5 V 200 kHz
1.5 V 50 kHz
20
10
5
5V
50 kHz
0
0
20
40
60
80
100
0
0
20
40
60
80
100
PWM Duty Cycle, D (%)
Figure 14. LED current versus PWM duty cycle; 200 kHz APWM frequency.
EN/PWM
C1
APWM
C2
PWM Duty Cycle, D (%)
Figure 15. Percentage Error of the LED current versus APWM signals.
EN/PWM
C1
APWM
C2
C3
I LED
C3
I LED
t
Figure 16. Diagram showing the transition of LED current from 40 mA
to 20 mA, when a 50% duty cycle signal is applied to the APWM pin;
EN/PWM = 1; shows EN/PWM (ch1, 5 V/div.), APWM (ch2, 5 V/div.), and
I LED (ch3, 20 mA/div.), t = 1 ms/div.
t
Figure 17. Diagram showing the transition of LED current from 20 mA
to 40 mA, when a 50% duty cycle signal is removed from the APWM pin.
EN/PWM = 1; shows EN/PWM (ch1, 5 V/div.), APWM (ch2, 5 V/div.), and
I LED (ch3, 20 mA/div.), t = 1 ms/div.
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
15
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