A8837 查看數據表（PDF） - Allegro MicroSystems
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A8837 Datasheet PDF : 11 Pages
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A8837
Photoflash Capacitor Charger with IGBT Driver
Functional Block Diagram
VIN
DCM
Detector
(dV/dt = 0)
18 μs
HmL
Triggered Timer
CHARGE
ILIM Decoder
CMP2
ILIM
Comparator
Adjustable
Reference
Enable
DONE
TRIGGER
VIN
IGBTDRV
GND
Control Logic
Q
S SET Q
R CLR Q
Q SET S
Q CLR R
One-Shot
SW
40 V
DMOS
FB
CMP1
1.2 V
Device Pin-out Diagram
NC 1
IGBTDRV 2
VIN 3
GND 4
CHARGE 5
10 NC
9 FB
8 DONE
7 TRIGGER
6 SW
Terminal List Table
Number Name
1,10
NC
No connection
Function
2
IGBTDRV IGBT driver gate drive output
3
VIN Power supply input
4
GND Device ground
5
CHARGE
Charging enable and ISWLIM code input; set to low to power-off
the A8837
6
SW Switch, internally connected to the DMOS power FET drain
7
TRIGGER Strobe signal input
8
¯D¯ ¯O¯ ¯N¯ ¯E¯
Open drain, when pulled low by internal MOSFET, indicates that
charging target level has been reached
9
FB Output voltage feedback
Allegro MicroSystems, Inc.
3
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
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