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参数资料
| 型号： | A8513KLPTR-T |
| 厂商： | Allegro Microsystems Inc |
| 文件页数： | 13/25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
The OVP condition can become a latched fault if, during an OVP
event, the LED current is not in regulation. This typically occurs
during an open LED string situation. If both faults occur simul-
taneously the IC will shut down and the fault flag will be set (see
figures 10, 11, and 13).
Undervoltage Protection The OVP pin is also used to detect
output undervoltage protection (UVP) against V OUT short to
GND. When the UVP fault is tripped, the fault flag is set (fig-
ure 14). Using an external PMOSFET interfaced to the ˉF ˉAˉ ˉUˉ ˉLˉ ˉTˉ
pin (figure 14), the user can disconnect the IC from VIN during a
C1
C2
C3
B
V OUT
FAULT
I LED
fault event.
B
V OUT
C4
A
t
EN/PWM
Figure 12. Power-up into an open LED situation. (A) A8513 enabled,
C2
C1
C3
A
C
FAULT
I LED
(B) fault flag (ch2, 5 V/div.) is set when OVP threshold is reached. Shows
V OUT (ch1, 20 V/div.), I LED (ch3, 100 mA/div.), and EN/PWM (ch4,
5 V/div.), time = 1 ms/div..
V OUT
B
A
C4
t
EN/PWM
C1
C2
I IN
Figure 10. Open LED condition during PWM dimming. (A) The LED string
(ch3, 100 mA/div.) is opened (no current flow through the LED pin) during
an off-period for the PWM dimming signal (ch4, 5 V/div.). (B) At the next
PWM cycle, the LED open condition is detected and the A8513 starts
boosting the output voltage (ch1, 10 V/div.). (C) Upon reaching the OVP
threshold and sensing no LED current flow, the A8513 shuts down and
sets the fault flag (ch2, 5 V/div.). (time = 10 ms/div.)
C3
C4
PMOSFET Gate
FAULT
t
C1
B
B
C
C
V OUT
Figure 13. Input disconnect switch function during an output short. (A) V OUT
(ch1, 10 V/div.) falls during VOUT short to ground, (B) high peak current
present due to short, before the PMOSFET (ch3, 5 V/div.) is disconnected.
Shows input current (ch2, 10 A/div.) and fault flag (ch4, 5 V/div.),
time = 50 μ s/div.
C2
C3
A A
FAULT
I LED
V IN
1 k Ω
1 k Ω
L1
AO4421
5V
C4
V LED
10 k Ω
A8513
t
Figure 11. Open LED condition when PWM duty cycle is 100%. (A) The
LED string (ch3, 200 mA/div.) is opened (no current flow through the LED
pin). (B) The A8513 starts boosting the output voltage (ch1, 20 V/div.).
(C) Upon reaching the OVP threshold there is still no current flow through
2N7002
FAULT
the LED pin, and the A8513 shuts down and sets the fault flag (ch2,
5 V/div.). The LED pin voltage is ch4, 2 V/div. (time = 50 μ s/div.)
Figure 14. typical circuit for input disconnect switch.
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
13
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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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