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参数资料
| 型号： | A8514KLPTR-T |
| 厂商： | Allegro Microsystems Inc |
| 文件页数： | 25/42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
Fault Mode Table ( continued)
Wide Input Voltage Range, High Efficiency
Fault Tolerant LED Driver
Fault Name
Type
Active
Fault
Flag
Set
Description
Boost
Disconnect
Switch
Sink
driver
This fault prevents the device from starting-up if
LED Pin Short
Protection
Auto-restart
Startup
No
either of the LEDx pins are shorted. The device
stops soft-start from starting while either of the
LEDx pins are determined to be shorted. After the
Off
On
Off
short is removed, soft-start is allowed to start.
When an LEDx pin is open the device will determine
which LED pin is open by increasing the output
Off for
open
LED Pin open
Auto-restart
Normal
Operation
No
voltage until OVP is reached. Any LED string not
in regulation will be turned off. The device will then
On
On
pins.
On
go back to normal operation by reducing the output
voltage to the appropriate voltage level.
This fault occurs when the ISET current goes above
150% of the maximum current. The boost will stop
for all
others.
ISET Short Protection
Auto-restart
Always
No
switching, the disconnect switch will turn off, and
the IC will disable the LED sinks until the fault is
Off
On
Off
removed. When the fault is removed the IC will try
to to regulate to the preset LED current.
Fault occurs when the FSET/SYNC current goes
above 150% of maximum current, about 180 μ A.
FSET/SYNC Short
Protection
Auto-restart
Always
Yes
The boost will stop switching, the disconnect switch
will turn off, and the IC will disable the LED sinks
Off
Off
Off
until the fault is removed. When the fault is removed
the IC will try to restart with soft-start.
Overvoltage
Protection
Auto-restart
Always
No
Fault occurs when OVP pin exceeds V OVP(th)
threshold. The A8514 will immediately stop
switching to try to reduce the output voltage. If the
output voltage decreases then the A8514 will restart
switching to regulate the output voltage.
Stop
during
OVP
event.
On
On
Off for
Fault occurs when the LED pin voltage exceeds
shorted
LED Short Protection
Auto-restart
Always
No
V LEDSC . When the LED short protection is detected
the LED string that is above the threshold will be
On
On
pins.
On
removed from operation.
for all
others.
Overtemperature
Protection
VIN UVLO
Auto-restart
Auto-restart
Always
Always
No
No
Fault occurs when the die temperature exceeds the
overtemperature threshold, 165°C.
Fault occurs when V IN drops below V UVLO , 3.90 V
maximum. This fault resets all latched faults.
Off
Off
Off
Off
Off
Off
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
25
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