3961 Datasheet, PDF (2/10 Pages) Allegro MicroSystems – DUAL FULL-BRIDGE PWM MOTOR DRIVER

3961
DUAL FULL-BRIDGE
PWM MOTOR DRIVER
5
R_θJT = 6.0°C/W
4
3
SUFFIX 'B', R _θJA = 40°C/W
2
1
SUFFIX 'LB', R _θJA = 55°C/W
TRUTH TABLE
ENABLE
H
PHASE
X
L
H
L
L
X = Irrelevant
OUT_A
Off
H
L
0
25
50
75
100
125
150
TEMPERATURE IN °C
Dwg. GP-049A
FUNCTIONAL BLOCK DIAGRAM AND TYPICAL
BIPOLAR STEPPER MOTOR APPLICATION
MOTOR SUPPLY 1
LOGIC SUPPLY
MOTOR SUPPLY 2
C_BB
C_cc
V _BB1
V _cc
GND
V _BB2
C _BB2
OUT_B
Off
L
H
OUT 1A
OUT _1B
OUT_2A
OUT _2B
ENABLE 1
PHASE 1
RC1
CONTROL LOGIC
AND LEVEL SHIFT
BLANKING
TIME AND
+
SOURCE
_
DRIVER T _OFF
CONTROL
UVLO
AND
TSD
VOLTAGE
REFERENCE
CONTROL LOGIC
AND LEVEL SHIFT
BLANKING
+
TIME AND
SOURCE
_
DRIVER T _OFF
CONTROL
ENABLE 2
PHASE 2
RC ₂
SENSE ₁
E₁ ^I_FULL/PD REF_OUT
REF_IN E ₂
SENSE ₂
R_T1
C_T1
E₂
R_S1
R₁
R₂
R_S2
C_T2
R_T2
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