• State
  • Locked Locked
  • Replies 1 reply
  • Subscribers 64 subscribers
  • Views 180 views
  • Users 0 members are here
Support feedback
Options
Options
Similar topics

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

DCP020515D: DCP02 control through Sync input

Achim Stösser
Prodigy 20 points
Part Number: DCP020515D

Hi I found an application note sbaa035b in which it is decsribed how to control the Sync Pin to enable/disable  the DC/DC Converter.  

I have 3  DCP02 in my circuit and I control it with one transistor. Is this OK?

What if I measure a frequency of  ~ 580kHz on the sync pin after switching of the transistor, is the frequency of 580KHz  OK?

thanks

 Achim Stösser

ADD-DATA

  • 0
    TI__Expert 8130 points

    Hello Achim,

    One transistor should be okay. But, measuring 580kHz on sync pin is not okay. It is important that the capacitive loading on the SYNC pin be ≤ 3pF in order to prevent a reduction in the oscillator frequency which I believe is happening. Note, that connecting an oscilloscope probe to SYNC pin places a relatively large capacitance on pin, therefore decreasing the frequency of the oscillation. A low-capacitance probe must always be used for more appropriate readings.

    Regards,
    Alejandro