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| 型号： | A8439EEJTR-T |
| 厂商： | Allegro Microsystems Inc |
| 文件页数： | 2/15页 |
| 文件大小： | 0K |
| 描述： | IC CHARGER PHOTO FLASH 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： | 1.5mA |
| 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： | 1142 (CN2011-ZH PDF) |
| 其它名称： | 620-1203-6 |
A8439
Photoflash Capacitor Charger
with IGBT Driver and Refresh
Features and Benefits
Description
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Power with 1 Li+ or 2 Alkaline/NiMH/NiCAD batteries
Adjustable output voltage
Auto-refresh
>75% efficiency
Eight-level, digitally-programmable current limit
Charge complete indication
Integrated IGBT driver with trigger
No primary-side Schottky diode needed
Low-profile package (0.75 mm nominal height)
The A8439 is a highly integrated IC that charges photoflash
capacitors for digital and film cameras. An integrated MOSFET
switch drives the transformer in a flyback topology. It also
features an integrated IGBT driver that facilitates the flash
discharge function and saves board space.
The CHARGE pin enables the A8439 and starts the charging
of the output capacitor. When the designated output voltage is
reached, the A8439 stops the charging until the CHARGE pin
is toggled again, or when output voltage falls below 90% of
the designated value. Pulling the CHARGE pin low stops the
charging. The Dˉ Oˉ Nˉ Eˉ pin is an open-drain indicator of when
the designated output voltage is reached.
The peak current limit can be adjusted to eight different levels
Package: 10 pin TDFN/MLP (suffix EJ)
Approximate Scale
between 270 mA and 1.4 A, by clocking the CHARGE pin.
This allows the user to operate the flash even at low battery
voltages.
The A8439 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 A8439 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.
Applications include the following:
? Digital camera flash
? Film camera flash
Typical Applications
? Cell phone flash
? Emergency strobe light
V BATT
T1
V BIAS 3.0to5.5V
Two Alkaline/NiMH/NiCAD or one Li+ battery
or 1.5 to 5.5 V
D1
V OUT
One Li+ battery
V BATT or 3.0 to 5.5 V
T1
D1
V OUT
R4
100 k
R5
10 k
VIN
CHARGE
DONE
C1
0.1 μ F
SW
FB
A8439
C2
4.7 μ F
R1
R2
R3
COUT
C3
R4
100 k
R5
10 k
VIN
CHARGE
DONE
C1
0.1 μ F
C2
4.7 μ F
SW
FB
A8439
R1
R2
R3
COUT
C3
R6
10 k
TRIGGER
GND
IGBTDRV
To IGBT Gate
R6
10 k
TRIGGER
GND
IGBTDRV
To IGBT Gate
Figure 1. Typical circuit with separate power supply to transformer
A8439-DS, Rev. 7
Figure 2. Typical circuit with single power supply
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