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参数资料
| 型号： | A8514KLPTR-T |
| 厂商： | Allegro Microsystems Inc |
| 文件页数： | 19/42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
While the IC is being PWM-dimmed, the IC rechecks the dis-
abled LED every time the PWM signal goes high, to prevent false
tripping of an LED short event. This also allows some self-cor-
rection if an intermittent LED pin short to V OUT is present.
Overvoltage protection
The A8514 has overvoltage protection (OVP) and open Schottky
diode (D1 in figure 1) protection. The OVP protection has a
default level of 8.1 V and can be increased up to 53 V by con-
necting resistor R OVP between the OVP pin and V OUT . When
the current into the OVP pin exceeds 199 μ A (typical), the OVP
comparator goes low and the boost stops switching.
The following equation can be used to determine the resistance
for setting the OVP level:
R OVP is the value of the external resistor, in Ω ,
V OVP(th) is the pin OVP trip point found in the Electrical Charac-
teristics table, and
I OVPH is the current into the OVP pin.
There are several possibilities for why an OVP condition would
be encountered during operation, the two most common being: a
disconnected output, and an open LED string. Examples of these
are provided in figures 22 and 23.
Figure 22 illustrates when the output of the A8514 is discon-
nected from load during normal operation. The output voltage
instantly increases up to OVP voltage level and then the boost
stops switching to prevent damage to the IC. If the output is
drained off, eventually the boost might start switching for a short
where:
R OVP = ( V OUTovp – V OVP(th) ) / I OVPH
(6)
duration until the OVP threshold is hit again.
Figure 23 displays a typical OVP event caused by an open LED
V OUTovp is the target overvoltage level,
string. After the OVP condition is detected, the boost stops
Output disconnect
event detected
V OUT
V OUT
LED string open
condition detected
C2
C1
C3
SW node
PWM
C2
C1
C3
SW node
PWM
I OUT
C4
t
Figure 22. OVP protection in an output disconnect event; shows V OUT
(ch1, 10 V/div.), SW node (ch2, 50 V/div.), PWM (ch3, 5 V/div.), and
I OUT (ch4, 200 mA/div.), time = 1 ms/div.
I OUT
C4
t
Figure 23. OVP protection in an open LED string event; shows V OUT
(ch1, 10 V/div.), SW node (ch2, 50 V/div.), PWM (ch3, 5 V/div.), and
I OUT (ch4, 200 mA/div.), time = 500 μ s/div.
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
19
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