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参数资料
| 型号： | A8502KLPTR-T |
| 厂商： | Allegro Microsystems Inc |
| 文件页数： | 19/35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： | 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： | 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 |
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A8502
Wide Input Voltage Range, High Efficiency
Fault Tolerant LED Driver
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:
disconnected output, and an open LED string. Examples of these
are provided in figures 21 and 22.
Figure 21 illustrates when the output of the A8502 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
where:
R OVP = ( V OUTovp – V OVP(th) ) / I OVPH
(5)
drained off, eventually the boost might start switching for a short
duration until the OVP threshold is hit again.
V OUTovp is the target overvoltage 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
Figure 22 displays a typical OVP event caused by an open LED
string. After the OVP condition is detected, the boost stops
switching, and the open LED string is removed from operation.
Afterwards V OUT is allowed to fall, and eventually the boost will
resume switching and the A8502 will resume normal operation.
A8502 also has built-in secondary overvoltage protection to
protect the internal switch in the event of an open diode condi-
tion. Open Schottky diode detection is implemented by detecting
overvoltage on the SW pin of the device. If voltage on the SW
Output disconnect
event detected
V OUT
V OUT
LED string open
condition detected
SW node
C2
C3
PWM
C1
I LED
C4
t
Figure 21. 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 LED (ch4, 200 mA/div.), time = 1 ms/div.
SW node
C2
C3
PWM
C1
I LED
C4
t
Figure 22. 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 LED (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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