MC33063 DC/DC

kirem rahmani

Hi All,

Is there any way to disable the part without using a high side switch i.e. shorting the timing capacitor or something similar?

Thanks for any help in advance,

-Kirem

over 14 years ago

0 Ron Michallick over 14 years ago

TI__Guru**** 164796 points

Hello Kirem,

There are three ways to keep the internal switch off. In order of preference;
1) Set pin 5 greater than 1.35V (up to VCC)
2) Set pin 3 greater than 2V (up to VCC-1V)
3) Set pin 7 less than VCC-0.5V (down to 0V)

All voltages are relative to pin 4, GND
The output will fall to zero for Buck and Inverting designs.
The output will be near VIN for boost designs.

Regards,
Ron Michallick

0 kirem rahmani over 14 years ago in reply to Ron Michallick

Prodigy 30 points

Hi Ron,

Thanks for the quick answer. Will try to incorporate and validate on my design.

-Kirem

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MC33063 DC/DC