I would like to confirm VSET of DRV8832.
Can we use PWM signal to VSET directry (without RC (LPF) circuit)?
(for example, MCU supplies to VSET.)
Are there any problems using PWM signal without LPF?
Best regards,
Atsushi Yamauchi
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I would like to confirm VSET of DRV8832.
Can we use PWM signal to VSET directry (without RC (LPF) circuit)?
(for example, MCU supplies to VSET.)
Are there any problems using PWM signal without LPF?
Best regards,
Atsushi Yamauchi
Hi Yamauchi-san,
The VSET will not work using PWM without LPF. Without the LPF, the VSET will swing from 3.3V to 0
There are several choices available to set VSET.
1) Tie VREF to VSET.
2) Connect VSET to a resistor divider to set a lower voltage.
3) Use a PWM with a LPF to create a stable VSET. This is difficult without some type of monitor circuit because of variation of the microcontroller output and the resistor/capacitor.
4) Use a DAC output if available on the microcontroller.
Dear Rick-san,
Thank you for your response.
I understood if MCU supplies PWM without LPF to VSET, VSET are two conditions (3.3V or 0V) only and
it cannot control the voltage regulation.
Is it correct?
Best regards,
Atsushi Yamauchi
Hi Yamauchi-san,
Yes, 3.3V and 0 are the two conditions only. If you try PWM'ing without a LPF, the voltage will be (dutycycle)% 3.3V and (100-dutycycle)% 0V.