topic Re: S12ZVM boost converter in S12 / MagniV Microcontrollers

S12ZVM boost converter

ikkishingu — Thu, 12 Mar 2015 07:06:10 GMT

Hello,

Please check whether my understanding is correct about S12ZVM boost converter.

There are the specs about boost converter in S12ZVM as below,

VSUP boost turn on trip point V_BSTON : min 9.5V, typ 10.1V, max 10.6V

VSUP boost turn off trip point V_BSTOFF : min 9.75V, typ 10.3V, max 10.8V

My understanding is that:

1. These means

- when the VSUP becomes below V_BSTON, then the boost converter operates

and

- when the VSUP becomes above V_BSTOFF, then the boost converter doesn't operate.

2. Therefore, there is the hysteresis features and the boosted VSUP voltage has a ripple equivalent to V_BSTON-V_BSTOFF during boosting.

Is my understanding correct?

Best Regards,

Ikki

iggi — Tue, 17 Mar 2015 12:27:54 GMT

Hi,

Well, yes, your understanding is correct. In case of low voltage on VSUP pin the boost converter operates (assuming that GBOE bit is set).

Not sure about the ripple. There are two capacitors in the external circuit of the boost converter. So the ripple should be reduced.

Regards,

iggi

ikkishingu — Tue, 17 Mar 2015 13:00:54 GMT

Dear iggi,

Thank you for your information!

ikki