A8425 データシートの表示（PDF） - Allegro MicroSystems
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A8425
Allegro MicroSystems
A8425 Datasheet PDF : 16 Pages
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A8425
High Current Photoflash Capacitor Charger
with IGBT Driver for Two Li+ Batteries
Pin-out Diagram
GSOURCE 1
12 TLIM
GSINK 2
11 DONE
EP
VIN 3
10 TRIGGER1
GND 4
9 SW
(Top View)
Terminal List Table
Number
1
2
3
4
5
6, 7
8
9
10
11
12
13
14
15
16
–
Name
GSOURCE
GSINK
VIN
GND
CHARGE
NC
TRIGGER2
SW
TRIGGER1
¯D¯ ¯O¯ ¯N¯ ¯E¯
TLIM
VBAT
VSEL
ISET
VDRV
EP
Function
IGBT gate drive – source connection
IGBT gate drive – sink connection
Input voltage; connect to a 3.0 to 5.5 V voltage source
Ground connection
Pull high to initiate charging; pull low to enter low-power standby mode
No connection
IGBT input trigger 2; internally ANDed with TRIGGER1 pin
Drain connection of internal power MOSFET switch; connect to the other terminal of the transformer primary winding
IGBT input trigger 1; internally ANDed with TRIGGER2 pin
Pulls low when output reaches target value and CHARGE pin is high; remains low until CHARGE pin is cycled
Sets time limit for minimum pulse width (secondary-side conduction time); apply logic high for shorter pulses or logic
low for longer pulses; see Selection of Transformer section for details
Battery voltage; connect to the same power supply as is used for the transformer primary winding
Output voltage selection; use in conjunction with transformers of differing turns ratios (N = 8, 9, or 10) to achieve
target output voltage and optimal efficiency (this feature is not yet finalized)
Sets the maximum switch current; connect an external resistor (value of 25 to 80 kΩ) between this pin and GND to
set the target peak current (between 1.0 and 3.2 A)
Supply for IGBT gate driver
Exposed pad for enhanced thermal dissipation (not connected electrically)
Allegro MicroSystems, Inc.
3
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
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