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| 型号： | A8515GLPTR-T |
| 厂商： | Allegro Microsystems Inc |
| 文件页数： | 18/34页 |
| 文件大小： | 0K |
| 描述： | IC LED DVR WHT/RGB BKLGT 16TSSOP |
| 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： | 背光 |
| 类型 - 次要： | 白色 LED |
| 频率： | 600kHz ~ 2.5MHz |
| 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 ~ 105°C |
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A8515
LED short detect
Wide Input Voltage Range, High Efficiency
Fault Tolerant LED Driver
199 μ A typical, the OVP comparator goes low and the boost stops
Both LEDx pins are capable of handling the maximum V OUT that
the converter can deliver, thus providing protection from the LED
pin to V OUT in the event of a connector short.
switching.
The following equation can be used to determine the resistance
for setting the OVP level:
An LED pin that has a voltage exceeding V LEDSC will be
removed from operation (see figure 20). This is to prevent the IC
from dissipating too much power by having a large voltage pres-
where:
R OVP = ( V OUTovp – V OVP(th) ) / I OVPH
(5)
ent on an LEDx pin.
While the IC is being PWM-dimmed, the IC rechecks the dis-
abled LED every time the EN/PWM signal goes high, to prevent
false tripping of an LED short event. This also allows some self-
correction if an intermittent LED pin short-to-V OUT is present.
Overvoltage protection
The A8515 has overvoltage protection (OVP) and open Schottky
diode protection. The OVP protection has a default level of 8 V
and can be increased up to 55 V by connecting R OVP between the
OVP pin and V OUT . When the current into the OVP pin exceeds
C1
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
disconnected output, and an open LED string. Examples of these
are provided in figures 21 and 22.
I OUT
LED1
C2
EN/PWM
C3
t
Figure 20. Example of the disabling of an LED string when the LED pin
voltage is increased above 4.6 V; shows I OUT (ch1, 200 mA/div.), LED1
(ch2, 5 V/div.), and EN/PWM (ch3, 5 V/div.), 10 μ s/div.
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
18
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| A8517KLPTR-T | 功能描述:LED 驱动器 IC 10 输出 DC DC 稳压器 升压（升压） PWM 调光 60mA 28-TSSOP-EP 制造商:allegro microsystems, llc 系列:汽车级，AEC-Q100 包装:剪切带（CT） 零件状态:停产 类型:DC DC 稳压器 拓扑:升压（升压） 内部开关:是 输出数:10 电压 - 供电（最低）:4.5V 电压 -?供电（最高）:36V 电压 - 输出:- 电流 - 输出/通道:60mA 频率:400kHz ~ 2.3MHz 调光:PWM 应用:汽车级 工作温度:-40°C ~ 125°C（TA） 安装类型:表面贴装 封装/外壳:28-SOIC（0.173"，4.40mm 宽）裸露焊盘 供应商器件封装:28-TSSOP-EP 标准包装:1 |
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