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A8436 Datasheet

  • A8436

  • Photoflash Capacitor Charger with IGBT Driver

  • 12頁(yè)

  • ALLEGRO   ALLEGRO

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A8436
Package EJ:
MLP/TDFN, 3 脳 3 mm
0.75 mm Nominal Height
Photoflash Capacitor
Charger with IGBT Driver
FEATURES
Power with 1 Li+ or 2 Alkaline/NiMH/NiCAD batteries
Adjustable output voltage
>75% efficiency
Three levels of switch current limit: 1.0, 1.2, 1.4 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)
Approximate Scale 1:1
The A8436 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 A8436
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:
1.0, 1.2, and 1.4 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 A8436 and starts the
charging of the output capacitor. When the designated
output voltage is reached, the A8436 stops the charg-
ing until the CHARGE pin is toggled again. Pulling
the CHARGE pin low stops charging. The D爐 爐 爐 pin
爐 ONE
爐 爐 爐爐
is an open-drain indicator of when the designated out-
put voltage is reached.
The A8436 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 A8436 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.
A8436-DS, Rev. 2
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
V
OUT
T1
+
C1
0.1 渭F
C2
4.7 渭F
V
BIAS
3.0 to 5.5 V
R1
R2
R5
100 k惟
1.4 A
1.2 A (N.C.)
1.0 A
10 k惟
R4
COUT
VIN
ILIM
CHARGE
DONE
TRIGGER
GND
SW
FB
A8436
IGBTDRV
R3
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
R5
100 k惟
1.4 A
1.2 A (N.C.)
1.0 A
10 k惟
R4
C1
0.1 渭F
C2
4.7 渭F
R1
R2
COUT
VIN
ILIM
CHARGE
DONE
TRIGGER
GND
SW
FB
A8436
IGBTDRV
R3
To IGBT Gate
Figure 2. Typical circuit with single power supply

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