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参数资料
| 型号： | A8438EEJTR-T |
| 厂商： | Allegro Microsystems Inc |
| 文件页数： | 1/15页 |
| 文件大小： | 0K |
| 描述： | IC PHOTOFLASH CHARGER 10-MLP |
| 标准包装： | 1 |
| 应用： | 照相机闪光灯电容器充电器 |
| 电流 - 电源： | 5mA |
| 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： | 10-WFDFN 裸露焊盘 |
| 供应商设备封装： | 10-TDFN/MLP（3x3） |
| 包装： | 标准包装 |
| 产品目录页面： | 1141 (CN2011-ZH PDF) |
| 其它名称： | 620-1099-6 |
A8438
Photoflash Capacitor Charger with IGBT Driver
Features and Benefits
Description
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Power with 1 Li+ or 2 Alkaline/NiMH/NiCAD batteries
Adjustable output voltage
>75% efficiency
Three levels of switch current limit: 1.6, 1.8, 2.0 A
Fast charge time
Charge complete indication
Integrated IGBT driver with trigger
No primary-side Schottky diode needed
Low-profile package (0.75 mm nominal height)
The A8438 is a highly integrated IC that charges photoflash
capacitors for digital and film cameras. It also features an
integrated IGBT driver that facilitates the flash discharge
function and saves board space.
To charge the photoflash capacitor, the A8438 integrates a
40 V, DMOS switch that drives the transformer in a flyback
topology, allowing optimized design with tight coupling
and high efficiency. A proprietary control scheme optimizes
the capacitor charging time. Low quiescent current and low
shutdown current further improve system efficiency and extend
battery life.
Three levels of switch current limit are provided: 1.6, 1.8,
and 2.0 A. The level is determined by configuring the ILIM
Package: 10 pin TDFN/MLP (suffix EJ)
Approximate Scale 1:1
pin as grounded, floating, or pulled up to IC supply voltage,
respectively.
The CHARGE pin enables the A8438 and starts the charging
of the output capacitor. When the designated output voltage
is reached, the A8438 stops the charging until the CHARGE
pin is toggled again. Pulling the CHARGE pin low stops
charging. The Dˉ Oˉ Nˉ Eˉ pin is an open-drain indicator of when
the designated output voltage is reached.
The A8438 can be used with two Alkaline/NiMH/NiCAD or one
single-cell Li+ battery connected to the transformer primary.
Connect the VIN pin to a 3.0 to 5.5 V supply, which can be
either the system rail or the Li+ battery, if used.
The A8438 is available in a very low profile (0.75 mm)
10-terminal 3×3 mm MLP/TDFN package, making it ideal
for space-constrained applications. It is lead (Pb) free, with
100% matte-tin leadframe plating.
Typical Applications
Two Alkaline/NiMH/NiCAD or one Li+ battery
V BIAS 3.0 to 5.5 V
or 1.5 to 5.5 V
V BATT
T1
D1
V OUT
One Li+ battery
V BATT or 3.0 to 5.5 V
T1
D1
V OUT
R5
100 k
2.0 A
1.8 A (N.C.)
1.6 A
R4
10 k
VIN
ILIM
C1
0.1 μ F
SW
FB
C2
4.7 μ F
R1
R2
COUT
R5
100 k
2.0 A
1.8 A (N.C.)
R4
10 k
VIN
ILIM
C1
0.1 μ F
C2
4.7 μ F
SW
R1
R2
COUT
DONE
CHARGE
A8438
R3
1.6 A
DONE
FB
A8438
R3
R6
10 k
R7
10 k
TRIGGER
GND
IGBTDRV
To IGBT Gate
R6
10 k
R7
10 k
CHARGE
TRIGGER
GND
IGBTDRV
To IGBT Gate
Figure 1. Typical circuit with separate power supply to transformer
A8438-DS, Rev. 2
Figure 2. Typical circuit with single power supply
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相关代理商/技术参数 |
参数描述 |
|---|---|
| A8439 | 制造商:ALLEGRO 制造商全称:Allegro MicroSystems 功能描述:Photoflash Capacitor Charger with IGBT Driver and Refresh |
| A8439EEJTR-T | 功能描述:IC CHARGER PHOTO FLASH 10-MLP 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 |
| A843DSC | 制造商:Pentair Technical Products / Hoffman 功能描述:Enclosure, Junction Box, 8.00x4.00x2.75in, Flat Cover, NEMA 4, Mild Steel 制造商:Pentair Technical Products / Hoffman 功能描述:ENCLOSURE JUNCTION BOX STEEL GRAY 制造商:Pentair Technical Products / Hoffman 功能描述:ENCLOSURE, JUNCTION BOX, STEEL, GRAY 制造商:Hoffman Enclosures 功能描述:SCREW COVER DSC ENCLOSURE8 X 4 X 2.75 制造商:Pentair Technical Products / Hoffman 功能描述:ENCLOSURE, JUNCTION BOX, STEEL, GRAY, Enclosure Type:Junction Box, Enclosure Mat 制造商:Pentair Technical Products / Hoffman 功能描述:ENCLOSURE, JUNCTION BOX, STEEL, GRAY, Enclosure Type:Junction Box, Enclosure Material:Steel, Body Color:Grey, External Height - Imperial:8", External Height - Metric:203mm, External Width - Imperial:4", External Width - Metric:102mm , RoHS Compliant: Yes |
| A844 | 制造商:TE Connectivity 功能描述:- Bulk |
| A8447 | 制造商:ALLEGRO 制造商全称:Allegro MicroSystems 功能描述:High Voltage Step Down Regulator |
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