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参数资料
| 型号： | A8740EEETR-T |
| 厂商： | Allegro Microsystems Inc |
| 文件页数： | 4/18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
Functional Block Diagram
VBAT
V SW – V BAT
SW
ILIM
Reference
DCM
Detector
t off (max)
18 μ s
Control Logic
S Q
DMOS
V DS ref
OCP
H L
Triggered Timer
R
Q
t on (max)
VIN_DRV
18 μ s
S
R
Q
Q
Enable
DONE
CHARGE
VIN_DRV
IGBT Driver
TRIG
Terminal List
GND
GATE
Number
Name
Function
Pin-out Diagram
1
ˉDˉ ˉOˉ ˉNˉ ˉEˉ
Open collector output, pulls low when output reaches target value and CHARGE is
high. Goes high during charging or whenever CHARGE is low.
DONE 1
TRIG 2
GATE 3
GND 4
PAD
8
7
6
5
CHARGE
VIN_DRV
VBAT
SW
2
3
4
5
TRIG
GATE
GND
SW
IGBT trigger input.
IGBT gate drive output.
Ground connection.
Drain connection of internal DMOS switch. Connect to transformer primary winding.
(Top View)
6
7
8
–
VBAT
VIN_DRV
CHARGE
PAD
Battery voltage.
Input voltage. Connect to 3 to 5.5 V bias supply. Decouple V IN voltage with 0.1 μ F
ceramic capacitor placed close to this pin.
Charge enable pin. Set this pin low to shut down the chip.
Exposed pad for enhanced thermal dissipation. Connect to ground plane.
Allegro MicroSystems, Inc.
115 Northeast Cutoff
3
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
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