UCC28600 Method ON/OFF from the outside(Enable function)

Katsunori Hayashi

Expert 4610 points

Other Parts Discussed in Thread: UCC28600

UCC28600 Team,

Many thanks.

We received a question about I/F which let UCC28600 circuit have ON/OFF from the outside(external signal).

Could you please tell me the method concrete.

Best regards

___________________________________________

Katsunori HAYASHI

Engineering Professional

FAE Group/Metropolitan Area/Sales_&_Marketing

Texas Instruments Japan Limited. (TIJ)

TEL:+81-3-4331-7120 E-mail:k-hayashi@ti.com

over 9 years ago

0 Bernard Keogh over 9 years ago

TI__Genius 9130 points

Hayashi-san,

It should be possible to interface an external remote on/off signal to the UCC28600 SS (soft-start) pin.

If this pin is pulled low, the PWM will be disabled, and will remain disabled as long as SS < 0.8 V.

Depending on the logic polarity of the external on/off signal, the interface to the SS pin may be different. The SS pin can be pulled to GND by and open-collector npn, or open-drain nfet, or through a pull-down diode. Since there is an internal offset on the SS pin of 1 V (0.8 V min), it does not need to pulled all the way to GND, so a pull-down diode may be used.

I hope this helps answer your question.

Thanks,
Bernard

0 Katsunori Hayashi over 9 years ago in reply to Bernard Keogh

TI__Expert 4610 points

Bernard-san,

Many thanks.

I received your reply, and so thanks.

Best regards

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Katsunori HAYASHI

Engineering Professional / Power Management

Field Application & Solutions / Sales & Applications

Texas Instruments Japan Limited. (TIJ)

TEL:+81-3-4331-3689 E-mail:k-hayashi@ti.com

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UCC28600 Method ON/OFF from the outside(Enable function)