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3974 데이터 시트보기 (PDF) - Allegro MicroSystems
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3974
DMOS DUAL FULL-BRIDGE PWM MOTOR DRIVER
Allegro MicroSystems
3974 Datasheet PDF : 12 Pages
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3974
DMOS DUAL FULL-BRIDGE
PWM MOTOR DRIVER
FUNCTIONAL BLOCK DIAGRAM
V
DD
LOGIC
SUPPLY
CHARGE PUMP
BANDGAP
V
DD
C
REG
TSD
UNDER-
VOLTAGE &
FAULT DETECT
CHARGE
PUMP
V
BB1
+
LOAD
SUPPLY
1
BANDGAP
REGULATOR
V
REG
CONTROL LOGIC
OUT
1A
ENABLE
1
OSC
CLOCK
DATA
STROBE
FIXED OFF
PROGRAMMABLE
BLANK
PWM TIMER
DECAY
SERIAL
PORT
FIXED OFF
PROGRAMMABLE
BLANK
PWM TIMER
DECAY
ZERO CURRENT DETECT
CURRENT SENSE
REFERENCE
BUFFER &
DIVIDER
CHARGE
PUMP
OUT
1B
SENSE
1
C
S1
R
S1
REF
1
LOAD
SUPPLY
2
+
V
REF
V
BB2
SLEEP
MODE
ENABLE
2
CONTROL LOGIC
TO PWM TIMER
ZERO CURRENT DETECT
CURRENT SENSE
REFERENCE
BUFFER &
DIVIDER
OUT
2A
OUT
2B
SENSE
2
C
S2
R
S2
REF
2
V
REF2
Dwg. FP-048-1
2
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
Copyright © 2001 Allegro MicroSystems, Inc.
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