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参数资料
| 型号： | A8437ECGLT |
| 厂商： | Allegro Microsystems Inc |
| 文件页数： | 14/22页 |
| 文件大小： | 0K |
| 描述： | IC PHOTOFLASH CAP CHARGER WLCSP |
| 标准包装： | 24,000 |
| 应用： | 照相机闪光灯电容器充电器，Xenon |
| 电源电压： | 2.3 V ~ 5.5 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 12-UFBGA，WLCSP |
| 供应商设备封装： | 12-WLCSP |
| 包装： | 带卷 (TR) |
A8437
Ambient Light Sensing
Mobile Phone Xenon Photoflash Capacitor Charger
with IGBT Driver
can flow through the phototransistor. This forces the
Ambient Light Sensing (ALS) can be easily imple-
mented for the A8437 using the TRIGGER2 pin plus
three external components. This configuration is
shown in the figure below.
The phototransistor current is proportional to the
intensity of the light that it receives. When there is
sufficient ambient light (for example, during daylight
outdoor photographing), a current of about 30 μ A
voltage at TRIGGER2 pin to fall to 0.8 V or lower,
so it prohibits TRIGGER1 from firing the flash. The
exact threshold of ambient light required to prohibit
flash firing can be adjusted by R TGR1 . The smaller this
resistance, the brighter the ambient light must be to
prohibit flash firing.
When ambient conditions are dark, the current flow-
ing through the phototransistor is in less than 1 μ A.
Because the TRIGGER2 pin is biased at 1.4 V or
Battery Input
2.3 to 5.5 V
1 : 10
TLIM
ISET
C2
VIN
Control
+
VOUT Detect
C1
SW
COUT
100 μ F
315 V
RSET
Block
ISW sense
Connect
to VIN
REG
CHARGE
DONE
DONE
A Bias Voltage
2.5 to 5.5 V
TRIGGER1
VIN
IGBT Driver
GSOURCE
IGBT Gate
R TGR1
100 k Ω
PNZ121S
Phototransistor
TRIGGER2
C TGR1
1 μ F
GSINK
GND
A It is recommend to use a regulated system voltage for the bias.
If battery voltage is used, the ALS sensitivity will vary with
battery voltage, and there would be a small leakage current
even when the camera is turned off.
ALS typical application (CG package shown)
Allegro MicroSystems, Inc.
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 |
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|---|---|
| A8437EEJTR-T | 功能描述:IC PHOTOFLASH CAP CHARGER 10TDFN RoHS:是 类别:集成电路 (IC) >> PMIC - 电源管理 - 专用 系列:- 标准包装:1 系列:- 应用:手持/移动设备 电流 - 电源:- 电源电压:3 V ~ 5.5 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:14-WFDFN 裸露焊盘 供应商设备封装:14-LLP-EP（4x4） 包装:Digi-Reel® 配用:LP3905SD-30EV-ND - BOARD EVALUATION LP3905SD-30 其它名称:LP3905SD-30DKR |
| A8438 | 制造商:ALLEGRO 制造商全称:Allegro MicroSystems 功能描述:Photoflash Capacitor Charger with IGBT Driver |
| A8438_06 | 制造商:ALLEGRO 制造商全称:Allegro MicroSystems 功能描述:Photoflash Capacitor Charger with IGBT Driver |
| A8438_13 | 制造商:ALLEGRO 制造商全称:Allegro MicroSystems 功能描述:Photoflash Capacitor Charger with IGBT Driver |
| A8438EEJTR-T | 功能描述:IC PHOTOFLASH CHARGER 10-MLP RoHS:是 类别:集成电路 (IC) >> PMIC - 电源管理 - 专用 系列:- 应用说明:Ultrasound Imaging Systems Application Note 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:37 系列:- 应用:医疗用超声波成像，声纳 电流 - 电源:- 电源电压:2.37 V ~ 6 V 工作温度:0°C ~ 70°C 安装类型:表面贴装 封装/外壳:56-WFQFN 裸露焊盘 供应商设备封装:56-TQFN-EP（8x8） 包装:管件 |
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