1. Home
  2. Electronics Design
  3. Bipolar stepper driving ?

Bipolar stepper driving ?

I have some steppers (bipolar 4-wires) from printers I would like to test.

This is the motor I'm trying to test.

formatting link

Full motor datasheet

formatting link

I bought some Toshiba LDMOS bipolar drivers TB6598FN. Typical application. This is my schematic exactly the same.

formatting link

Simplified block diagram of driver.

formatting link

Truth table

formatting link

Full Datasheet TB6598FN

formatting link

The motors are getting a regulated 12Vdc and the driver gets 5Vdc.

My questions.

From the datasheet for best performance my control signals should be about 400Hz? 50% or less duty?

How should my control signals be for forward stepping?

The truth table just shows EN1&2 high,IN1&2 LOW. If I pulse IN1&2 they will go from forward to reverse and back again.

What should the sequence be to the four control pins for simple forward stepping?

I'll be using a PIC probably just 12f508 for my control signals.

Reply to
Hammy
Loading thread data ...

formatting link

Use a H-bridge to allow either polarity across each winding. Call winding 1 "vertical" A to B; winding 2 "horizontal" C to D. Try A-B, A-B & C-D, C-D, C-D & B-A, B-A, etc; opposite direction for opposite motion.

Reply to
Robert Baer

The TB6598FN is a dual H-BRIDGE IC.

The problem is they show one "EN" and one "IN" line going to each bridge or actually they show it going to a box labelled bridge.

formatting link

I know I have to pulse each arm in sequence but what is what from the diagram?

They don't say which line controls which N-channel and P-Channel combo. The truth table is even more confusing they say if EN1&2 are high and IN1&2 are low the motor will move in the forward direction. I dont want to pulse one bridge for forward movement and then pulse the other one for reverse.

I'm trying to figure out the sequence I would have to pulse the four control lines for forward rotation.

formatting link

Reply to
Hammy

r

it isn't best datasheet I've seen, but it is clear what the pins does.

EN1/2 pins enable or disable the h-bridge, when low all transistors are off.

IN1/2 pins control the h-bridge when the EN1/2 is high.

just so set EN1 and EN2 high and toggle IN1 and IN2

IN1: 110011001100 IN2: 011001100110

-Lasse

Reply to
langwadt

Thank you

I wasnt sure.

Reply to
Hammy

ElectronDepot website is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.