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Toshiba TB6560 bipolar controller

2015-03-02 10:43  
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Toshiba TB6560 bipolar controller

 TB6560AHQ

 It is, nowadays, very common on the market (ebay for instance) to find a lot of controllers based on a very cheap ic: the Toshiba TB6560 considered a modern replacement of the old TA8435HQ. 

The TB6560AHQ is a PWM chopper-type stepping motor driver IC designed for sinusoidal-input microstep control of bipolar stepping motors. The TB6560AHQ can be used in applications that require 2-phase, 1-2-phase, 2W1-2-phase and 4W1-2-phase excitation modes. The TB6560AHQ is capable of low-vibration, high-performance forward and reverse driving of a two-phase bipolar stepping motor using only a clock signal.

Many boards using such ic got broken in very few seconds (sometimes even less :-) ) due to small mistakes or misundestandings on the procedure of use of such ics mainly dued to an incomplete reading of the datasheet and the application note of this ic.

Franckly speaking we have to say that this is a very delicate ic:

the power supply must be very well filtered, and a fast fuse on the power supply line must be used;

it is better not exceed the supply of 24V particularly if used with 3A/phase motors;

attention must be payd to the design: masses must be connected in a single point, if possible, away from the ic;

the logic of the ic must be powered before the motors (this is a normal situation for any other driver/controller)

the ic must be connected to a large heat sink cooled, if possible, by a small fan because the heat generated is important.

In very few words it must be used with care.

Here follows a simple schematic for a test board (studied to be easily milled):

TB6560AHQ

The schematics is really simple. Please remember:

·         the value of the resistors connected to NFA and NFB sets the current for the motor according to the following simple formula: Imot=0.5/R therefore using a 0.5ohm the current for the motors is set to 1 Amp;

·         the capacitor C5 sets the frequency of the internal clock. This frequency is related to the lenght of the clock input pulse. Using a 330pf capacitor the frequency will be around 130Khz and the clock lenght necessary to recognize the pulse around 30uS while using a 100pf capacitor the frequency will be around 400Khz and the minimum pulse lenght of 10us.

JP settings table: JP1 (Torque) JP2 (Decay) JP3 (excitation mode):

JP1

JP2

JP3

TQ1

TQ2

Torque resulting

DC1

DC2

Decay value

M1

M2

Excitation mode

L

L

100%

L

L

0%

L

L

1

L

H

75%

L

H

25%

L

H

1/2

H

L

50%

H

L

50%

H

L

1/8

H

H

25%

H

H

100%

H

H

1/16

 

 

This is the testing board:

TB6560AHQ