Datasheet

TMC6200 DATASHEET (Rev. 1.04 / 2019-AUG-08) 11

www.trinamic.com

Attention

In case VSA is supplied by a different voltage source, make sure that VSA does not drop out during

motor operation. The motor driver should be disabled in case VSA becomes switched off before VS.

Hard switching edges on VSA might result in bridge cross-conduction otherwise. It is safest to derive

VSA voltage from VS supply.

Attention

Make sure, that VCC_IO does not drop out during operation of the motor. Disable the drive when a

falling supply voltage is detected. It is safest to derive VCC_IO voltage from VS supply.

Hint

Production devices use VCC_IO undervoltage detection to disable the MOSFET drivers. This will avoid

motor overcurrent due to instable input levels during power-up / power-down for most cases.

However, it is best practice to disable the motor prior to switching off power supply, and to make

sure, that the motor power supply does come up without or not remain with missing VCC_IO supply.

Initial devices dated 1836 do not yet implement this VCC_IO controlled undervoltage reset of the

drivers.

3.2 External Gate Voltage Regulator

At high supply voltages like 48V, the internal gate voltage regulator and the internal 5V regulator

have considerable power dissipation, especially with high MOSFET gate charges or high chopper

frequency. A good thermal coupling of the heat slug to the system PCB GND plane is required to

dissipate heat. Still, the thermal thresholds will be lowered significantly by self-heating. To reduce

power dissipation, supply an external gate driver voltage to the TMC6200. Figure 3.2 shows the

required connection. The internal gate voltage regulator becomes disabled in this constellation. 12V

+/-1V is recommended for best results.

12V Gate Voltage

Supply

5V Regulator

5VOUT

VSA

2.2µ

100n

Gate Voltage

Regulator

12VOUT

Figure 3.2 External gate voltage supply

Hint

With MOSFETs above 50nC of total gate charge or chopper frequency >40kHz, it is recommended to

use a VSA supply not higher than 40V in order to keep reasonable power dissipation.