A3974SED Allegro Microsystems Inc, A3974SED Datasheet - Page 4

• Manufacturer Part Number: A3974SED
• Description: IC MOTOR DRVR PWM DUAL 44-PLCC
• Manufacturer: Allegro Microsystems Inc

Specifications of A3974SED

• Applications: DC Motor Driver
• Number Of Outputs: 2
• Current - Output: ±1.5A
• Voltage - Load: 15 V ~ 50 V
• Voltage - Supply: 4.5 V ~ 5.5 V
• Operating Temperature: -20°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 44-LCC (J-Lead)
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

A3974
ENABLE
ENABLE
STROBE
CLOCK
SLEEP
MODE
DATA
OSC
SUPPLY
LOGIC
1
2
PROGRAMMABLE
PROGRAMMABLE
PWM TIMER
V
PWM TIMER
CHARGE PUMP
DD
BANDGAP
C
TSD
V
REG
DD
TO PWM TIMER
FIXED OFF
FIXED OFF
CONTROL LOGIC
BLANK
CONTROL LOGIC
DECAY
SERIAL
BLANK
FAULT DETECT
DECAY
PORT
VOLTAGE &
DMOS Dual Full-Bridge PWM Motor Driver
UNDER-
FUNCTIONAL BLOCK DIAGRAM
Copyright © 2001 Allegro MicroSystems, Inc.
CHARGE
CHARGE
PUMP
PUMP
CURRENT SENSE
CURRENT SENSE
ZERO CURRENT DETECT
ZERO CURRENT DETECT
LOAD
SUPPLY
V
REFERENCE
REFERENCE
BB1
BUFFER &
BUFFER &
DIVIDER
DIVIDER
+
REGULATOR
1
BANDGAP
Allegro MicroSystems, Inc.
115 Northeast Cutoff
1.508.853.5000; www.allegromicro.com
Worcester, Massachusetts 01615-0036 U.S.A.
OUT
OUT
V
SENSE
REF
LOAD
SUPPLY
OUT
OUT
SENSE
REF
REG
1
1A
1B
2A
2B
2
R
R
+
1
S1
2
S2
2
Dwg. FP-048-1
C
C
S1
S2
V
V
V
BB2
REF
REF2
3