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A8439 Datasheet

  • A8439

  • Photoflash Capacitor Charger with IGBT Driver and Refresh

  • 12頁(yè)

  • ALLEGRO   ALLEGRO

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A8439
Package EJ:
MLP/TDFN, 3 脳 3 mm
0.75 mm Nominal Height
Photoflash Capacitor Charger
with IGBT Driver and Refresh
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)
Approximate Scale 1:1
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 D爐 爐 爐
爐 ONE
爐 爐 爐爐
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脳3 mm MLP/TDFN package,
making it ideal for space-constrained applications. It is
lead (Pb) free, with 100% matte-tin leadframe plating.
APPLICATIONS
Digital camera flash
Film camera flash
Cell phone flash
Emergency strobe light
Two Alkaline/NiMH/NiCAD or one Li+ battery
or 1.5 to 5.5 V
D1
V
BATT
T1
+
C1
0.1 渭F
C2
4.7 渭F
V
BIAS
3.0 to 5.5 V
V
OUT
R1
R2
COUT
R4
100 k惟
VIN
SW
FB
CHARGE
DONE
TRIGGER
GND
A8439
IGBTDRV
R3
C3
To IGBT Gate
Figure 1. Typical circuit with separate power supply to transformer
One Li+ battery
V
BATT
or 3.0 to 5.5 V
T1
D1
V
OUT
R1
R2
C1
0.1 渭F
C2
4.7 渭F
COUT
R4
100 k惟
VIN
SW
FB
CHARGE
DONE
TRIGGER
GND
A8439
IGBTDRV
R3
C3
To IGBT Gate
Figure 2. Typical circuit with single power supply
A8439-DS, Rev. 1

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