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参数资料
| 型号： | A8514KLPTR-T |
| 厂商： | Allegro Microsystems Inc |
| 文件页数： | 15/42页 |
| 文件大小： | 0K |
| 描述： | IC LED DVR WHT 4X80MA 16-ETSSOP |
| 标准包装： | 8,000 |
| 拓扑： | PWM，SEPIC，升压（升压） |
| 输出数： | 4 |
| 内部驱动器： | 是 |
| 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： | 20-TSSOP（0.173"，4.40mm 宽）裸露焊盘 |
| 供应商设备封装： | 20-TSSOP-EP |
| 包装： | 带卷 (TR) |
| 工作温度： | -40°C ~ 125°C |
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A8514
Wide Input Voltage Range, High Efficiency
Fault Tolerant LED Driver
V OUT
LED current setting and LED dimming
The maximum LED current can be up to 80 mA per channel,
COMP
and is set through the ISET pin. To set the I LED current, connect
a resistor, R ISET , between this pin and ground, according to the
following formula:
C2
C1
PWM
R ISET = (1.003 × 653) / I LED
(3)
C3
where I LED is in A and R ISET is in Ω . This sets the maximum cur-
rent through the LEDs, referred to as the 100% current . Standard
R ISET values, at gain equals 653, are as follows:
C4
I LED
Standard Closest R ISET
Resistor Value
(k Ω )
8.25
10.2
16.5
22.1
LED current per LED, I LED
(mA)
80
65
40
30
t
Figure 11B. Typical PWM diagram showing V OUT , I LED , and COMP pin as
well as the PWM signal. PWM dimming frequency is 500 Hz at 1% duty
cycle ; shows V OUT (ch1, 10 V/div.), COMP (ch2, 2 V/div.), PWM (ch3,
5 V/div.), and I LED (ch4, 50 mA/div.), time = 500 μ s/div.
PWM
PWM dimming
The LED current can be reduced from the 100% current level
by PWM dimming using the PWM/EN pin. When the PWM/EN
pin is pulled high, the A8514 turns on and all enabled LEDs sink
100% current. When PWM/EN is pulled low, the boost converter
and LED sinks are turned off. The compensation (COMP) pin is
floated, and critical internal circuits are kept active. The typical
C1
C2
I LED
PWM dimming frequencies fall between 200 Hz and 1 kHz. Fig-
ures 11A to 11D provide examples of PWM switching behavior.
t
Figure 11C. Delay from rising edge of PWM signal to LED current; shows
PWM (ch1, 2 V/div.), and I LED (ch2, 50 mA/div.), time = 200 ns/div.
C2
V OUT
COMP
C1
PWM
C1
C3
PWM
I LED
C2
C4
I LED
t
Figure 11A. Typical PWM diagram showing V OUT , I LED , and COMP pin as
well as the PWM signal. PWM dimming frequency is 500 Hz at 50% duty
cycle; shows V OUT (ch1, 10 V/div.), COMP (ch2, 2 V/div.), PWM (ch3,
5 V/div.), and I LED (ch4, 50 mA/div.), time = 500 μ s/div.
t
Figure 11D. Delay from falling edge of PWM signal to LED current turn off;
shows PWM (ch1, 2 V/div.), and I LED (ch2, 50 mA/div.), time = 200 ns/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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