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参数资料
| 型号： | A8513KLPTR-T |
| 厂商： | Allegro Microsystems Inc |
| 文件页数： | 14/25页 |
| 文件大小： | 0K |
| 描述： | IC LED DRVR AUTO BCKLGHT 16TSSOP |
| 特色产品： | Allegro A8513 LED Driver |
| 标准包装： | 1 |
| 拓扑： | PWM，SEPIC，升压（升压） |
| 输出数： | 1 |
| 内部驱动器： | 是 |
| 类型 - 主要： | 车载，背光 |
| 类型 - 次要： | 白色 LED |
| 频率： | 1.8MHz ~ 2.2MHz |
| 电源电压： | 4.5 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： | 标准包装 |
| 工作温度： | -40°C ~ 125°C |
| 其它名称： | 620-1440-6 |
A8513
Wide Input Voltage Range, High Efficiency
Fault Tolerant LED Driver
Secondary Overvoltage Protection The A8513 has secondary
overvoltage protection for the internal boost switch in the event
of an open diode condition. If the voltage on the SW pin exceeds
the device safe operating voltage rating, the A8513 is disabled
C1
A
B
FAULT
and remains latched off (figure 15). The EN/PWM pin must be
brought low longer than t PWML to clear this fault.
C
B
COMP
Boost switch overcurrent protection
The boost switch is protected with cycle-by-cycle current limit-
ing set to I SW(LIM) (figure 16). There is also a secondary current
limit that is sensed on the boost switch. When this current limit
is exceeded, the A8513 immediately shuts down (figure 17). The
C2
C3
A
Cycle-by-cycle inductor current limit
I L
secondary current limit is above the cycle-by-cycle current limit
and protects the switch from destructive currents if the boost
inductor is shorted.
t
Figure 16. Cycle-by-cycle current limit, inductor current is C3 (1 A/div.).
(A) Fault flag (ch1, 5 V/div.) is not set during cycle-by-cycle current limit,
(B) COMP pin signal (C2, 2 V/div.) is close to 3.6 V. (time = 1 ms/div.)
A
FAULT
B
V SW
C1
V SW
C1
C2
C3
FAULT
I LED
B
C2
C3
I L
Normal operation
A
Inductor Short
t
Figure 15. Secondary Overvoltage protection tripped when the switching
diode is opened during operation. (A) High voltage is detected on SW
node (ch1, 20 V/div.) and the A8513 is shut down. (B) Fault flag is set
(ch2, 5 V/div.). Shows LED current (ch3, 100 mA/div.), time = 500 ns/div.
t
Figure 17. Secondary current limit during an inductor short condition.
(A) limit is reached, (B) the IC shuts down and the fault flag is set. Shows
fault flag (c1, 5 V/div.), switch node voltage (C2, 20 V/div.), and current
through the inductor (C3, 2 A/div.); time = 1 μ s/div.
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
14
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相关代理商/技术参数 |
参数描述 |
|---|---|
| A8513KLYTR-1-T | 制造商:ALLEGRO 制造商全称:Allegro MicroSystems 功能描述:Wide Input Voltage Range, High Efficiency Fault Tolerant LED Driver |
| A8513KLYTR-2-T | 制造商:ALLEGRO 制造商全称:Allegro MicroSystems 功能描述:Wide Input Voltage Range, High Efficiency Fault Tolerant LED Driver |
| A8513KLYTR-3-T | 制造商:ALLEGRO 制造商全称:Allegro MicroSystems 功能描述:Wide Input Voltage Range, High Efficiency Fault Tolerant LED Driver |
| A8513KLYTR-T | 功能描述:IC LED DRVR AUTO BCKLGHT 10MSOP RoHS:是 类别:集成电路 (IC) >> PMIC - LED 驱动器 系列:- 特色产品:LM3445 TRIAC Dimmable LED Driver 标准包装:55 系列:PowerWise® 恒定电流:是 恒定电压:- 拓扑:PWM，降压（降压） 输出数:1 内部驱动器:无 类型 - 主要:- 类型 - 次要:高亮度 LED（HBLED） 频率:30kHz ~ 1MHz 电源电压:8 V ~ 12 V 输出电压:- 安装类型:表面贴装 封装/外壳:14-SOIC（0.154"，3.90mm 宽） 供应商设备封装:14-SOICN 包装:管件 工作温度:-40°C ~ 125°C 产品目录页面:1285 (CN2011-ZH PDF) 其它名称:LM3445M |
| A8514 | 制造商:ALLEGRO 制造商全称:Allegro MicroSystems 功能描述:The A8514 is a multi-output white LED driver for small-size LCD backlighting. |
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