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| 型号： | A8516ELPTR-T |
| 厂商： | Allegro Microsystems Inc |
| 文件页数： | 13/17页 |
| 文件大小： | 0K |
| 描述： | IC LED DVR BACKLIGHT MON 24TSSOP |
| 标准包装： | 8,000 |
| 拓扑： | PWM，升压（升压） |
| 输出数： | 6 |
| 内部驱动器： | 是 |
| 类型 - 主要： | 背光 |
| 类型 - 次要： | RGB，白色 LED |
| 频率： | 300kHz ~ 1MHz |
| 电源电压： | 8 V ~ 24 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 24-TSSOP（0.173"，4.40mm）裸露焊盘 |
| 供应商设备封装： | 24-TSSOP 裸露焊盘 |
| 包装： | 带卷 (TR) |
| 工作温度： | -40°C ~ 85°C |
A8516
LED Backlight Driver for LCD Monitors and Televisions
Thermal Shutdown (TSD) The IC shuts down when junction
Fault Mode
temperature exceeds 165°C. It will recover automatically when
the junction temperature falls below 125°C approximately.
VIN Undervoltage Lockout (UVLO) The device is shut
down when input voltage, V IN , falls below V UVLO . Any existing
latched fault is cleared.
V IN Operating Range Considerations When V IN is above
V UVLO and below 10 V, the IC will operate correctly, but its gate
driver voltage may not reach the regulation target of 7 V. This
may cause excessive switching and conduction loss if the external
MOSFET is not fully enhanced.
During normal operation, the IC draws approximately
10 to 15 mA from the VIN pin, depending on switching fre-
quency and the external MOSFET. At V IN = 12 V, this translates
into 120 to 180 mW of power consumption, most of it dissipated
in internal linear regulators. This power increases proportionally
with input voltage. Therefore it is highly recommended to keep
V IN between 10 and 24 V during normal operation.
If the input battery voltage must be higher than 24 V, a better
solution is to power the VIN pin separately using a 12 V supply.
Doing this reduces the heat dissipation of the IC, and improves
the overall system efficiency.
Fault State
Over-
voltage
Protection
Pulse-
by-Pulse
Current Limit
Overcurrent
Protection
Over-
temperature
Protection
LED Short
Protection
VIN UVLO
Auto-
Restart
Yes
Yes
Yes
Yes
No
No
Description
Fault occurs when output voltage exceeds
the OVP setpoint voltage. Used to prevent
the output voltage from damaging the power
components.
Fault occurs when the current through the
external MOSFET increases such that the
voltage across the SENSE1 and SENSE2 pins
exceeds 95 mV typical. The MOSFET switch is
turned off on a cycle-per-cycle basis.
Multiple pulse-by-pulse current limits will cause
the COMP pin voltage to rise. After a time
period determined by the COMP pin current
and the COMP capacitor, the COMP voltage will
exceed the overcurrent detect threshold, forcing
a fault. System may hiccup if the total current
requirement is too high.
Fault occurs when the die temperature exceeds
the over-temperature threshold, 165°C typical.
Fault occurs when the LED pin voltage exceeds
V SC , 25 V typical.
Fault occurs when VIN drops below V UVLO ,
6.5 V typical. This fault resets all latched faults.
13
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
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