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| 型号： | A8502KLPTR-T |
| 厂商： | Allegro Microsystems Inc |
| 文件页数： | 24/35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
Shutdown
Wide Input Voltage Range, High Efficiency
Fault Tolerant LED Driver
response to a triggered fault condition is summarized in the Fault
If the PWM/EN pin is pulled low for more than t PWML (32,750
clock cycles), the device enters shutdown mode and clears all
internal fault registers. As an example, at a 2 MHz clock fre-
quency, it will take approximately 16.3 ms to shut down the IC
into the low power mode (figure 32). When the A8502 is shut
down, the IC will disable all current sources and wait until the
PWM/EN signal goes high to re-enable the IC. If faster shut
down is required, the FSET/SYNC pin can be used.
Fault protection during operation
The A8502 constantly monitors the state of the system to deter-
mine if any fault conditions occur during normal operation. The
Fault Mode Table
Mode table.
The possible fault conditions that the device can detect are: Open
LED pin, LED pin shorted to ground, shorted inductor, V OUT
short to ground, SW pin shorted to ground, ISET pin shorted to
ground, and input disconnect switch source shorted to ground.
Note the following:
? Some of the protection features might not be active during
startup, to prevent false triggering of fault conditions.
? Some of these faults will not be protected if the input disconnect
switch is not being used. An example of this is V OUT short to
ground.
Fault Name
Primary switch
overcurrent protection
(cycle-by-cycle
current limit)
Type
Auto-restart
Active
Always
Fault
Flag
Set
No
Description
This fault condition is triggered by the cycle-by-
cycle current limit, I SW(LIM) .
Boost
Off for
a single
cycle
Disconnect
switch
On
Sink
driver
On
When the current through the boost switch exceeds
Secondary switch
current limit
Latched
Always
Yes
secondary current SW limit (I SW(LIM2) ) the device
immediately shuts down the disconnect switch,
LED drivers, and boost. The Fault flag is set. To re-
Off
Off
Off
enable the device, the PWM/EN pin must be pulled
low for 32,750 clock cycles.
The device is immediately shut off if the voltage
across the input sense resistor is 2X the preset
current value. The Fault flag is set. If the input
Input disconnect
current limit
Latched
Always
Yes
current limit is between 1X and 2X, the Fault flag
is set but the IC will continue to operate normally
Off
Off
Off
for t GFAULT1 or until it is shut down. To re-enable
the device the PWM/EN pin must be pulled low for
32,750 clock cycles.
Secondary overvoltage protection is used for open
diode detection. When diode D1 opens, the SW pin
Secondary OVP
Latched
Always
Yes
voltage will increase until V OVP(SEC) is reached. This
fault latches the IC. The input disconnect switch is
Off
Off
Off
disabled as well as the LED drivers, and the Fault
flag is set. To re-enable the part the PWM pin must
be pulled low for 32,750 clock cycles.
Continued on the next page…
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
24
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| A8504910100N | 功能描述:环形MIL规格后盖 Backshell, Envrn, EMI/RFI, Strt, Nickel, Size 48 RoHS:否 制造商:Amphenol PCD MIL 类型:MIL-DTL-38999 III, IV 系列:AS85049 产品类型:Environmental EMI/RFI Backshells 外壳类型:Straight 外壳大小:18 外壳材质:Aluminum Alloy |
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