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參數(shù)資料
| 型號(hào)： | A8439 |
| 廠商： | Allegro MicroSystems, Inc. |
| 英文描述： | Photoflash Capacitor Charger with IGBT Driver and Refresh |
| 中文描述： | 照相閃光燈電容充電器與IGBT驅(qū)動(dòng)器和刷新 |
| 文件頁(yè)數(shù)： | 1/12頁(yè) |
| 文件大?。?/td> | 537K |
| 代理商： | A8439 |
A8439-DS, Rev. 1
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 charg-
ing until the CHARGE pin is toggled again. Pulling
the CHARGE pin low stops the charging. The ˉDˉOˉNˉ
pin is an open-drain indicator of when the designated
output voltage is reached.
The peak current limit can be adjusted to eight dif-
ferent levels between 270 mA to 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.
Photoflash Capacitor Charger
with IGBT Driver and Refresh
A8439
Package EJ:
MLP/TDFN, 3 × 3 mm
0.75 mm Nominal Height
FEATURES
Power with 1 Li+ or 2 Alkaline/NiMH/NiCAD batteries
Adjustable output voltage
Autorefresh
>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)
APPLICATIONS
Digital camera flash
Film camera flash
Cell phone flash
Emergency strobe light
Approximate Scale 1:1
Figure 1. Typical circuit with separate power supply to transformer
Figure 2. Typical circuit with single power supply
To IGBT Gate
COUT
V
OUT
D1
T1
R1
R2
R3
One Li+ battery
or 3.0 to 5.5 V
V
BATT
C2
4.7 μF
C3
C1
0.1 μF
Ω
R4
A8439
CHARGE
GND
FB
SW
TRIGGER
IGBTDRV
DONE
VIN
+
To IGBT Gate
COUT
V
OUT
D1
T1
R1
R2
R3
Ω
R4
V
BATT
Two Alkaline/NiMH/NiCAD or one Li+ battery
or 1.5 to 5.5 V
V
BIAS
3.0 to 5.5 V
C2
4.7 μF
C1
0.1 μF
A8439
CHARGE
GND
FB
SW
TRIGGER
IGBTDRV
DONE
VIN
C3
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| A8439EEJTR-T | Photoflash Capacitor Charger with IGBT Driver and Refresh |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| A8439EEJTR-T | 功能描述:IC CHARGER PHOTO FLASH 10-MLP RoHS:是 類別:集成電路 (IC) >> PMIC - 電源管理 - 專用 系列:- 標(biāo)準(zhǔn)包裝:1 系列:- 應(yīng)用:手持/移動(dòng)設(shè)備 電流 - 電源:- 電源電壓:3 V ~ 5.5 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:14-WFDFN 裸露焊盤 供應(yīng)商設(shè)備封裝:14-LLP-EP（4x4） 包裝:Digi-Reel® 配用:LP3905SD-30EV-ND - BOARD EVALUATION LP3905SD-30 其它名稱: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 制造商全稱:Allegro MicroSystems 功能描述:High Voltage Step Down Regulator |
| A8447SLJ-T | 制造商:Allegro MicroSystems LLC 功能描述:HIGH VOLTAGE STEP DOWN REGULATOR |
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