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参数资料
| 型号： | A8514KLPTR-T |
| 厂商： | Allegro Microsystems Inc |
| 文件页数： | 24/42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
Wide Input Voltage Range, High Efficiency
Fault Tolerant LED Driver
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 33). When the A8514 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 A8514 constantly monitors the state of the system to deter-
mine if any fault conditions occur during normal operation. The
response to a triggered fault condition is summarized in the Fault
Mode table.
Fault 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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| A8515GLPTR-T | 功能描述:IC LED DVR WHT/RGB BKLGT 16TSSOP RoHS:是 类别:集成电路 (IC) >> PMIC - LED 驱动器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- 恒定电流:- 恒定电压:- 拓扑:升压（升压），切换式电容器（充电泵） 输出数:1 内部驱动器:是 类型 - 主要:背光 类型 - 次要:白色 LED 频率:625kHz ~ 875kHz 电源电压:2.7 V ~ 5.3 V 输出电压:5V 安装类型:表面贴装 封装/外壳:10-TFSOP，10-MSOP（0.118"，3.00mm 宽） 供应商设备封装:10-µMAX 包装:带卷 (TR) 工作温度:-40°C ~ 85°C |
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