MC33039DG 查看數據表（PDF） - ON Semiconductor

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MC33039DG

Closed Loop Brushless Motor Adapter

ON Semiconductor 

MC33039, NCV33039

Rotor Electrical Position (Degrees)

0

60 120 180 240 300 360

480

φA

60° Sensor

Electrical

Phasing

φB

Input

φC

600 720

φA

120° Sensor

Electrical

Phasing

φB

Input

φC

φA Output

Latch ISetI Input

RT/CT

Vth ≈ 0.67 VCC

fout Output

Vout (AVG)

Constant Motor Speed

Increasing Motor

Speed

Figure 1. Typical Three Phase, Six Step Motor Application

OPERATING DESCRIPTION

The MC33039 provides an economical method of

implementing closed−loop speed control of brushless DC

motors by eliminating the need for a magnetic or optical

tachometer. Shown in the timing diagram of Figure 1, the

three inputs (Pins 1, 2, 3) monitor the brushless motor rotor

position sensors. Each sensor signal transition is digitally

detected, ORied at the Latch iSeti Input, and causes CT to

discharge. A corresponding output pulse is generated at fout

(Pin 5) of a defined amplitude, and programmable width

determined by the values selected for RT and CT (Pin 6). The

average voltage of the output pulse train increases with

motor speed. When fed through a low pass filter or

integrator, a DC voltage proportional to speed is generated.

Figure 2 shows the proper connections for a typical closed

loop application using the MC33035 brushless motor

controller. Constant speed operation down to 100 RPM is

possible with economical three phase four pole motors.

The φA inverter output (Pin 4) is used in systems where the

controller and motor sensor phasing conventions are not

compatible. A method of converting from either convention

to the other is shown in Figure 3. For a more detailed

explanation of this subject, refer to the text above Figure 39

on the MC33035 data sheet.

The output pulse amplitude VOH is constant with

temperature and controlled by the supply voltage on VCC

(Pin 8). Operation down to 5.5 V is guaranteed over

temperature. For systems without a regulated power supply,

an internal 8.25 V shunt regulator is provided.

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