Datasheet

TMC6200 DATASHEET (Rev. 1.04 / 2019-AUG-08) 12
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3.3 Zero Standby Current
Battery powered applications often require low current standby, while keeping the supply switched
on. The TMC6200 can support these applications by completely powering down the control side, VSA,
and with this also the charge pump and 5V supply. See Figure 3.3 for an example using a P-MOSFET
as high-side switch. Gate charge / discharge is limited to avoid too steep slopes and excess current.
VCC_IO may remain active during standby operation. Make sure that the motor becomes disabled
before switching off the power supply!
5V Regulator
Gate Voltage
Regulator
5VOUT
NSTANDBY
0V=standby
3-5V for operation
2.2µ
100n
12VOUT
4.7µ
+V
M
BC546
100n22k
10k
BSS84
VSA
Figure 3.3 Standby Switch
Hint
Realize zero standby current by switching off VSA in standby mode. VCC_IO may remain active. Ensure
a slope-controlled power-up of 1V/µs or less to avoid excess current into VSA.
Attention
Test your circuit thoroughly in order to ensure a safe and clean power-up and standby power-up and
power-down event! When powering down the control side of the MOSFET drivers, MOSFET gate-off is
only ensured by high-resistive resistors within the TMC6200. This makes the circuit more susceptible
to injection of charge from MOSFET drain to gate, e.g. to high supply voltage slopes. Any spurious
cross-conduction could lead to destructive currents through the power MOSFETs.