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參數(shù)資料
| 型號(hào)： | A8438 |
| 廠商： | Allegro MicroSystems, Inc. |
| 英文描述： | Photoflash Capacitor Charger with IGBT Driver |
| 中文描述： | 照相閃光燈電容充電器采用IGBT驅(qū)動(dòng)器 |
| 文件頁(yè)數(shù)： | 1/13頁(yè) |
| 文件大?。?/td> | 528K |
| 代理商： | A8438 |
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A8438-DS, Rev. 1
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 trans-
former in a flyback topology, allowing optimized
design with tight coupling and high efficiency. A pro-
prietary control scheme optimizes the capacitor charg-
ing 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 config-
uring the ILIM 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 charg-
ing until the CHARGE pin is toggled again. Pulling
the CHARGE pin low stops charging. The ˉDˉOˉNˉ pin
is an open-drain indicator of when the designated out-
put 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.
Photoflash Capacitor
Charger with IGBT Driver
A8438
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
>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)
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
k
Ω
COUT
V
OUT
D1
T1
R1
R2
R3
R4
10
Ω
R5
One Li+ battery
or 3.0 to 5.5 V
V
BATT
C2
4.7 μF
C1
0.1 μF
2.0 A
1.8 A (N.C.)
1.6 A
A8438
CHARGE
GND
FB
SW
TRIGGER
IGBTDRV
DONE
ILIM
VIN
2.0 A
1.8 A (N.C.)
1.6 A
+
To IGBT Gate
k
Ω
COUT
V
OUT
D1
T1
R1
R2
R3
R4
10
100 k
Ω
R5
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
A8438
CHARGE
GND
FB
SW
TRIGGER
IGBTDRV
DONE
ILIM
VIN
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| A8438EEJTR-T | Photoflash Capacitor Charger with IGBT Driver |
| A8439 | Photoflash Capacitor Charger with IGBT Driver and Refresh |
| A8439EEJTR-T | Photoflash Capacitor Charger with IGBT Driver and Refresh |
| A8450 | Automotive Multioutput Voltage Regulator |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| A8438_06 | 制造商:ALLEGRO 制造商全稱:Allegro MicroSystems 功能描述:Photoflash Capacitor Charger with IGBT Driver |
| A8438_13 | 制造商:ALLEGRO 制造商全稱: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 類別:集成電路 (IC) >> PMIC - 電源管理 - 專用 系列:- 應(yīng)用說(shuō)明:Ultrasound Imaging Systems Application Note 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:37 系列:- 應(yīng)用:醫(yī)療用超聲波成像，聲納 電流 - 電源:- 電源電壓:2.37 V ~ 6 V 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:56-WFQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:56-TQFN-EP（8x8） 包裝:管件 |
| A8439 | 制造商:ALLEGRO 制造商全稱: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 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 |
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