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3933 Datasheet

  • 3933

  • THREE-PHASE POWER MOSFET CONTROLLER

  • 12頁(yè)

  • ALLEGRO   ALLEGRO

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Data Sheet
26301.100鈥?/div>
3933
RESET
PGND
AGND
GLC
DEAD
REF
SC
THREE-PHASE POWER
MOSFET CONTROLLER
The A3933SEQ is a three-phase MOSFET controller for use with
bipolar brushless dc motors. It drives all n-channel external power
FETs, allowing system cost savings and minimizing
r
(DS)on
power loss.
The high-side drive block is implemented with bootstrap capacitors at
each output to provide the floating positive supply for the gate drive.
The high-side circuitry also employs a unique 鈥渋ntelligent鈥?FET
monitoring circuit that ensures the gate voltages are at the proper levels
before turn-on and during the ON cycle. This device is targeted for
applications with motor supplies from 12 V to 28 V.
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鈥檚 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.
A power-loss braking circuit brakes the motor on an under-voltage
condition. The device is configured to either coast or dynamically
brake the motor when this occurs.
Dwg. PP-068
32
31
30
3
4
2
1
GHC
CC
GLB
SB
GHB
CB
GLA
SA
GHA
5
6
7
8
29
28
27
26
SENSE
RC
PWM
BRKSEL
BRKCAP
BRAKE
DIR
H2
H3
BRAKE
9
10
11
12
13
25
24
CONTROL LOGIC
23
19
22
21
14
17
FAULT
18
VBB
19
LCAP
16
VCCOUT
FAULT
MODE
CA
H1
20
15
The A3933SEQ is supplied in a 32-lead rectangular (9 x 7) plastic
chip carrier (quad pack) for minimum-area, surface-mount applica-
tions.
ABSOLUTE MAXIMUM RATINGS
at T
A
= 25
擄
C
Supply Voltage, V
BB
.............................
28 V
(peak) ..............................................
30 V
Terminal Voltage, V
CCOUT
.................
13.2 V
(peak) ..............................................
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 V
LCAP
Output Voltage Range,
V
SA
, V
SB
, V
SC
..................
-5 V to +30 V
V
GHA
, V
GHB
, V
GHC
.
-5 V to V
BB
+ 14 V
V
CA
, V
CB
, V
CC
.....................
V
SX
+ 14 V
Operating Temperature Range,
T
A
.................................
-20
擄
C to +85
擄
C
Junction Temperature, T
J
.................
+150
擄
C
Storage Temperature Range,
T
S
...............................
-55
擄
C to +150
擄
C
FEATURES
AND
BENEFITS
I
I
I
I
I
I
I
I
I
I
I
I
I
I
Drives External N-Channel FETs
Intelligent High-Side Gate Drive
Selectable Coast or Dynamic Brake on Power Down
Adjustable Dead Time for Cross-Conduction Protection
Selectable Fast or Slow Current-Decay Modes
Internal PWM Peak Current Control
Reset/Coast Input
120擄 Hall Commutation with Internal Pullup
Internal 5-V Regulator
Low-Side Synchronous Rectification
Direction Control
PWM Speed-Control Input
Fault-Diagnostic Output
Under-Voltage Protection

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    THREE-PHASE POWER MOSFET CONTROLLER
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