3932
RESET
PGND
AGND
GLC
DEAD
REF
SC
THREE-PHASE POWER
MOSFET CONTROLLER
The A3932SEQ is a three-phase MOSFET controller for use with bi-
polar brushless dc motors. Its high gate-current drive capability allows
driving a wide range of n-channel power MOSFETs and can support
motor supply voltages to 50 V. Bootstrapped high-side drive blocks
provide the floating positive supplies for the gate drive and minimize
the component count normally required. The high-side circuitry also
employs a unique FET monitoring circuit that ensures the gate voltages
are at the proper levels before turn-on and during the ON cycle.
Internal fixed off-time PWM current-control circuitry can be used to
regulate the maximum load current to a desired value. The peak load-
current limit is set by the user’s selection of an input reference voltage
and external sensing resistor. The fixed off-time pulse duration is set by
a user-selected external RC timing network. For added flexibility, the
continued ...
32
31
30
3
4
2
1
Data Sheet
26301.101d
GHC
CC
GLB
SB
GHB
CB
GLA
SA
GHA
5
6
7
8
9
10
29
28
27
26
25
24
SENSE
RC
PWM
TACH
SR
BRAKE
DIR
H2
H3
CONTROL LOGIC
11
12
13
23
19
22
21
FAULT
FEATURES
AND
BENEFITS
14
17
18
VBB
19
VREG
15
LCAP
16
H1
20
Dwg. PP-068-1
ABSOLUTE MAXIMUM RATINGS
at T
A
= 25°C
Supply Voltage, V
BB
..............................
50 V
Peak Regulator Voltage, V
REG
...............
15 V
Logic Input Voltage Range,
V
IN
...................
-0.3 V to V
LCAP
+ 0.3 V
Sense Voltage Range,
V
SENSE
............................
-5 V to +1.5 V
Output Voltage Range,
V
SA
, V
SB
, V
SC
..................
-5 V to +50 V
V
GHA
, V
GHB
, V
GHC
..
-5 V to V
BB
+ 17 V
V
CA
, V
CB
, V
CC
.....................
V
SX
+ 17 V
Operating Temperature Range,
T
A
.................................. -20°C to +85°C
Junction Temperature, T
J
..................
+150°C
Storage Temperature Range,
T
S
...............................
-55°C to +150°C
■
■
■
■
■
■
■
■
■
■
■
■
■
■
■
■
Drives Wide Range of N-Channel MOSFETs
Synchronous Rectification
Power MOSFET Protection
Adjustable Dead Time for Cross-Conduction Protection
100% Duty Cycle Operation
Selectable Fast or Slow Current-Decay Modes
Internal PWM Peak Current Control
High-Current Gate Drive
Motor Lead Short-to-Ground Protection
Internal 5-V Regulator
Brake Input
PWM Torque-Control Input
Fault-Diagnostic Output
Tachometer Output
Thermal Shutdown
Undervoltage Protection
FAULT
MODE
CA
3932
THREE-PHASE POWER
MOSFET CONTROLLER
Selection Guide
Part Number
A3932SEQ-T
A3932SEQTR-T
*
Pb-based
Pb-Free*
Yes
Yes
32 pieces/tube
Packing
13-in. reel, 800 pieces/reel
variants are being phased out of the product line. The variants cited in this footnote are in production but
have been determined to be NOT FOR NEW DESIGN. This classification indicates that sale of this device is currently
restricted to existing customer applications. The variants should not be purchased for new design applications because
obsolescence in the near future is probable. Samples are no longer available. Status change: May 1, 2006. These
variants include: A3932SEQ adn A3932SEQTR.
www.allegromicro.com
2
3932
THREE-PHASE POWER
MOSFET CONTROLLER
Functional Block Diagram
NOTE — For 12 V applications, VBB is shorted to VREG.
The V
REG
absolute maximum rating (15 V) must not be
exceeded.
PWM input can be used to provide speed/torque control,
allowing the internal current control circuit to set the maxi-
mum current limit.
Optional synchronous rectification is included. This
feature will short out the current path through the power
MOSFETs’ reverse body diodes during the PWM off-cycle
current decay. This can minimize power dissipation in the
power MOSFETs, eliminate the need for external power
clamp diodes, and potentially allow a more economical
choice for the MOSFET drivers.
The A3932 includes the commutation logic for Hall sen-
sors configured for 120 degree spacing. Power MOSFET
protection features include bootstrap capacitor charging
current monitor, undervoltage monitor, motor-lead short-
to-ground, and thermal shutdown.
The ‘–S–’ part-number suffix indicates an operating
temperature range of -20°C to +85°C. The ‘–EQ–’ suffix
indicates a 32-lead rectangular plastic chip carrier (PLCC).
The initial ‘–TR–’ variant suffix indicates tape and reel
packing. The ‘–T’ final variant suffix indicates lead (Pb)
free composition, with 100% matte tin leadframe plating.
2
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
Copyright © 2002, 2003 Allegro MicroSystems, Inc.
3932
THREE-PHASE POWER
MOSFET CONTROLLER
ELECTRICAL CHARACTERISTICS: unless otherwise noted at T
A
= 25°C; V
BB
= 18 V to 50 V; C
LCAP
,
C
boot
= 0.1 µF; C
REG
= 10 µF; C
load
= 3300 pF
;
f
PWM
= 22.5 kHz Square Wave; Two Phases Active.
Limits
Parameter
Supply Current
Quiescent Current
Reference Voltage
Output Voltage
I
BB
V
LCAP
V
REG
RESET high, coast mode, stopped
I
LCAP
= -3 mA
V
BB
= V
REG
≤15
V, I
REG
= -10 mA
18 V
≤
V
BB
≤
50 V, I
REG
= -10 mA
V
BB
= 13.2 V to 18 V, I
REG
= -10 mA
Output Voltage Regulation
Digital Logic Levels
Logic Input Voltage
V
IH
V
IL
Logic Input Current
Gate Drive
Low-Side Output Voltage
High-Side Output Voltage
Pulldown Switch Resistance
Pullup Switch Resistance
Low-Side Output
Switching Time
High-Side Output
Switching Time
Propagation Delay Time
(PWM to gate output)
Maximum Dead Time
Minimum Dead Time
V
GLxH
V
GHxH
r
DS(on)
r
DS(on)
t
rGLx
t
fGLx
t
rGHx
t
fGHx
t
pr
t
pf
t
dead
t
dead
I
GLx
= 0
I
GHx
= 0
I
GLx
= 50 mA
I
GHx
= -50 mA
10% to 90%, with C
load
90% to 10%, with C
load
10% to 90%, with C
load
90% to 10%, with C
load
GHx, GLx rising, C
load
= 0
GHx, GLx falling, C
load
= 0
GHx to GLx, V
DEAD
= 0 V, C
load
= 0
GLx to GHx, I
DEAD
= 780 µA, C
load
= 0
V
REG
- 0.8 V
REG
- 0.5
10.4
–
–
–
–
–
–
–
–
3.5
50
11.6
4.0
14
120
60
120
60
220
110
5.6
100
–
12.8
–
–
–
–
–
–
–
–
7.6
150
V
V
Ω
Ω
ns
ns
ns
ns
ns
ns
µs
ns
I
IH
I
IL
All inputs except SR
SR input only
All inputs except SR
SR input only
V
IH
= 2 V
V
IL
= 0.8 V
2.0
3.0
–
–
-30
-50
–
–
–
–
–
–
–
–
0.8
1.8
-90
-130
V
V
V
V
µA
µA
∆V
REG(∆IREG)
I
REG
= -1 to -30 mA, coast
∆
VREG(∆VBB)
I
REG
= -10 mA, coast
–
4.75
10.8
12.4
–
–
–
–
5.0
–
13
V
BB
- 2.5
25
40
8.0
5.25
13.2
13.6
–
–
–
mA
V
V
V
V
mV
mV
Symbol
Conditions
Min
Typ
Max
Units
NOTES: 1. Typical Data is for design information only.
2. Negative current is defined as coming out of (sourcing) the specified device terminal.
Continued —
www.allegromicro.com
3
3932
THREE-PHASE POWER
MOSFET CONTROLLER
ELECTRICAL CHARACTERISTICS: unless otherwise noted at T
A
= 25
°
C; V
BB
= 18 V to 50 V; C
LCAP
,
C
boot
= 0.1
µ
F; C
REG
= 10
µ
F; C
load
= 3300 pF
;
f
PWM
= 22.5 kHz Square Wave; Two Phases Active.
Limits
Typ Max
–
11.6
9.0
–
-25
0
0.91
-1.0
1.1
3.0
-9.0
2.0
9.7
9.1
–
–
0.75
165
10
37
–
12.8
12
±5.0
–
–
–
-1.1
1.2
3.3
–
2.7
10.2
9.6
0.5
0.5
–
–
–
–
Parameter
Bootstrap Capacitor
Bootstrap Charge Current
Bootstrap Output Voltage
Bootstrap Resistance
Symbol
I
Cx
V
Cx
r
Cx
V
io
I
SENSE
I
REF
t
blank
I
RC
V
RCL
V
RCH
Conditions
Min
100
Units
mA
V
Ω
mV
µA
µA
µs
mA
V
V
mA
V
V
V
V
V
µs
°C
°C
°C/W
V
Sx
= 0, I
Cx
= 0, V
REG
= 13 V
I
Cx
= -50 mA
0 V
≤
V
IC
≤
1.5 V
V
IC
≥
0 V, V
ID
≤
1.5 V
V
IC
≥
0 V, V
ID
≤
1.5 V
R
T
= 56 kΩ, C
T
= 470 pF
10.4
–
–
–
–
–
-0.9
1.0
2.7
–
Current Limit Circuitry
Input Offset Voltage
SENSE Input Current
REFERENCE Input Current
Blank Time
RC Charge Current
RC Voltage Threshold
Protection Circuitry
Bootstrap Charge Threshold
Motor Short-to-Ground Monitor
Undervoltage Threshold
FAULT Output Voltage
TACH Output Voltage
TACH Output Pulse Width
Thermal Shutdown Temp.
Thermal Shutdown Hysteresis
Thermal Resistance
I
Cx
V
DSH
UVLO
V
FAULT
V
TACH
t
TACH
T
J
∆T
J
R
θJA
High K board per JEDEC JESD51-7
V
BB
- V
SX
, high side on
Increasing V
REG
Decreasing V
REG
I
O
= 1 mA
I
O
= 1 mA
I
O
= 1 mA, C
TACH
= 50 pF
1.3
9.2
8.6
–
–
–
–
–
–
NOTES: 1.Typical Data is for design information only.
2.Negative current is defined as coming out of (sourcing) the specified device terminal.
4
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
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