OM9373 International Rectifier Corp., OM9373 Datasheet - Page 12

• Manufacturer Part Number: OM9373
• Description: Full-featured Power Module For Direct Drive Of 3-phase Brushless Dc Motor F-43 / Mp3-43l Packages
• Manufacturer: International Rectifier Corp.

OM9373
PHASE OUTPUTS (Phase A, Pins 41 and 42;
Phase B, Pins 36 and 37; Phase C, Pins 31 and 32)
These outputs are connected to either Vmotor via
the pull-up driver or Source via the pull-down driver,
depending upon the Hall-Effect and Direction Inputs
(see Commutation Truth Table). The two pins associated
with each Phase Output must be connected to one of the
three phases of the motor driven by the OM9373.
V
supply (Vm+). For proper operation, all three pins
Pin Designation
connected to the most positive terminal of the motor
Pin No.
12
MOTOR
10
11
1
2
3
4
5
6
7
8
9
+5V Reference Output
Oscillator Timing Input
(Pins 33, 38, and 43) - These pins are
Designation
EA2 "+" Input
EA1 "+" Input
EA1 "-" Input
EA2 "-" Input
EA2 Output
EA1 Output
PWM Input
I
V
sense
CC
Pin No.
12
13
14
15
16
17
18
19
20
21
22
Brake/Tach Timing Input
Overvoltage/Coast Input
Tachometer Output
Quad Select Input
Soft-Start Input
Designation
H3 Input
H2 Input
H1 Input
Ground
ISH
ISL
must be connected together externally with a low
impedance power bus.
should be bypassed with an adequately voltage-
rated ceramic capacitor, 0.1PF (typical), and a low-
ESR electrolytic capacitor, whose capacitance can
be selected by the following: 10PF-per-Ampere of
average motor current from V
Note: All connections, including the power bus
capacitor connections, must be made as close as
possible to the V
minimize parasitic effects.
Pin No.
23
24
25
26
27
28
29
30
31
32
33
( No Connection)
Phase C Output
Phase C Output
Designation
Direction Input
Motor Return
Motor Return
Speed Input
Source C
V
CSH
CSL
motor
motor
and Motor Return pins to
The V
Pin No. Designation
Case
motor
34
35
36
37
38
39
40
41
42
43
motor
to Motor Return.
(No Connection)
Phase A Output
Phase B Output
Phase B Output
Phase A Output
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Source B
Source B
Source A
Source A
power bus
V
V
motor
motor