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Internal Structure of motor adapter

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engineergc

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Hi,

I will use MC33039 motor adapter in a design. MC33039 doesn't have a spice model. Therefore I will design internal structure of MC33039 myself. I am working the understand internal structure of MC33039. I think delay and xor gates are used to provide edge detection. Also, schmitt trigger is used for noise immunity. But I can not understand purpose of or gate and monostable. Could you explain me?
 

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alec_t

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Page 3 of the datasheet explains the operation.
 

engineergc

New Member
I read datasheet many times. I built below circuit in LTSpice. At the output of or gate I take 5V, so set is 5V and reset is 0V. Since reset is 5V and reset is 0V, Q output of SR Latch is 5V. Purpose of this entegre provide speed control of motor. What are the function of or gate, nor gate and sr latch? Regards,
 

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alec_t

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The OR gate enables any one of the three position sensors to set the latch. The NOR gate enables the lower opamp to reset the latch when (a) the OR gate output has gone low and (b) the capacitor voltage has dropped below 0.3V.
 

engineergc

New Member
I understood purpose of latch. But in my simulation results are not correct. When negative and positive edges detected, I take below simulation results. When hall sensors connected to or gate, I take only 5V. Could you examine my design?
 

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alec_t

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Can't run your sim as I don't have all the models. Here's my version (A1 etc have default values for 1V logic).
OR-NOR-SR.JPG
 

alec_t

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If you're interested, here's my own LTspice model for the MC33039 adapter.
 

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