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参数资料
| 型号： | A8740EEETR-T |
| 厂商： | Allegro Microsystems Inc |
| 文件页数： | 6/18页 |
| 文件大小： | 0K |
| 描述： | IC PHOTOFLASH CAP CHARGER 8DFN |
| 标准包装： | 24,000 |
| 拓扑： | 交直流离线开关，反激式，PFC |
| 输出数： | 1 |
| 内部驱动器： | 无 |
| 类型 - 主要： | 闪灯/白光 |
| 电源电压： | 1.5 V ~ 5.5 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-UFDFN 裸露焊盘 |
| 供应商设备封装： | 8-DFN-EP（2x2） |
| 包装： | 带卷 (TR) |
| 工作温度： | -40°C ~ 85°C |
A8740
Ultra Small Mobile Phone Xenon Photoflash
Capacitor Charger with IGBT Driver
IGBT Drive Timing Definition
TRIG
50%
50%
GATE
t Dr
10%
t r
90%
t Df
90%
t f
10%
Operation Timing Diagram
VBAT
V IN
UVLO
CHARGE
SW
Target V OUT
V OUT
DONE
TRIG
GATE
T1
T2
T3
A
B
C
D
E
F
Explanation of Events
A: Start charging by pulling CHARGE to high, provided that V IN is above UVLO level.
B: Charging stops when V OUT reaches the target voltage.
C: Start a new charging process with a low-to- high transition at the CHARGE pin.
D: Pull CHARGE to low to put the controller in low-power standby mode.
E: Charging does not start, because V IN is below UVLO level when CHARGE goes high.
F: After V IN goes above UVLO, another low-to-high transition at the CHARGE pin is required to
start the charging.
T1, T2, T3 (Trigger instances): IGBT driver output pulled high whenever the TRIG pin is at logic
high. It is recommended to avoid applying any trigger pulses during charging.
Allegro MicroSystems, Inc.
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
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