TMC5161 DATASHEET (Rev. 1.01 / 2018-NOV-20)
16
Attention
In case VSA is supplied by a different voltage source, make sure that VSA does not drop out during
motor operation.
3.2 External Gate Voltage Regulator
At high supply voltages like 36V, the internal gate voltage regulator and the internal 5V regulator
have considerable power dissipation, especially with high chopper frequency or high system clock
frequency >12MHz. 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 TMC5161. Figure 3.2 shows the
required connection. The internal gate voltage regulator becomes disabled in this constellation. 12V
+/-1V are recommended for best results.
12V Gate Voltage
+VG
VSA
12VOUT
5VOUT
11.5V Voltage
regulator
2.2µ
5V Voltage
regulator
2.2µ
2R2
VCC
470n
Figure 3.2 External gate voltage supply
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