TMC5160 DATASHEET (Rev. 1.08 / 2018-NOV-19)
16
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.
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, 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
TMC5160. 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
Hint
With MOSFETs above 50nC of total gate charge, chopper frequency >40kHz, or at clock frequency
>12MHz, it is recommended to use a VSA supply not higher than 40V.
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