A8438(2005) Ver la hoja de datos (PDF) - Allegro MicroSystems
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Fabricante
A8438 Datasheet PDF : 13 Pages
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A8438 Photoflash Capacitor Charger with IGBT Driver
Functional Block Diagram
VIN
DCM
Comparator
CMP3
1.2 V
18 μs
H→L
Triggered Timer
ILIM
ILIM Decoder
CMP2
ILIM
Comparator
Adjustable
Reference
Enable
CHARGE
DONE
VIN
TRIGGER
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
Terminal List Table
IGBTDRV
GND
Device Pin-out Diagram
Number
1
2
3
4
5
6
7
8
9
10
Name
NC
IGBTDRV
VIN
GND
CHARGE
SW
TRIGGER
¯D¯ ¯O¯ ¯N¯ ¯E¯
FB
ILIM
Function
No connection
IGBT driver gate drive output
Power supply input
Device ground
Charging enable; set to low to
power-off the A8438
Switch, internally connected to the
DMOS power FET drain
Strobe signal input
Open drain, when pulled low by
internal MOSFET, indicates that
charging target level has been
reached
Output voltage feedback
Switch current limit setting; sets
three discreet levels
NC 1
IGBTDRV 2
VIN 3
GND 4
CHARGE 5
10 ILIM
9 FB
8 DONE
7 TRIGGER
6 SW
Package Thermal Characteristics
RθJA = 45 °C/W, on a 4-layer board. Additional information is
available on the Allegro Web site.
Absolute Maximum Ratings
Input or Output Voltage
SW pin, VSW............................................................ –0.3 to 40 V
IGBTDRV pin, VIGBTDRV.............................. –0.3 to VIN + 0.3 V
FB pin, VFB ............................................................... –0.3 to VIN
All other pins, Vx ...................................................... –0.3 to 7 V
Operating Ambient Temperature, TA ................................ –40°C to 85°C
Maximum Junction Temperature, TJ(max) ........................................ 150°C
Storage Temperature, TS .............................................. –55°C to 150°C
A8438-DS, Rev. 1
Allegro MicroSystems, Inc.
2
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
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