omc506 International Rectifier Corp., omc506 Datasheet - Page 3

• Manufacturer Part Number: omc506
• Description: Closed Loop Speed Controller For 3-phase Brushless Dc Motor Mp-3t Package
• Manufacturer: International Rectifier Corp.

CONTROL
Controller
The OMC506 is based on the Motorola MC33035 Brushless Motor Control I.C. This controller is used in
concert with the motorola MC33039 Closed Loop Brushless Motor Adapter I.C. to provide direct duty cycle
control of the motor speed. The OMC506 provides two quadrant speed control via an analog 0 to 5V signal
applied to the Vspeed ( pin22 ) input. The OMC506 is selected for 60/120 degree hall sensor spacing. The
commutation truth table for the OMC506 is shown in Table 1.
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Block Diagram
FWD/REV
TACH IN
ENABLE
6.2 V
BRAKE
V
RT/CT
V
+15 V
C.S.+
MOTOR
C.S.-
SPEED
OSC
V
F
OUT
OUT
REF
REGULATOR
CKTRY
OVER
TEMP
LOOP
SHAPING
COMPENSATION
TACHOMETER
+15 V
DRIVER
DRIVER
DRIVER
A
B
C
REFRESH
THREE
PHASE
R
SB
SC
SA
SENSE
A OUT
B OUT
C OUT
MOT
R
R
SENSE
SENSE
OMC506
RTN
3