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LM5023: How to vary the switching frequency

SATHISHKUMAR vishwanatha
Intellectual 495 points
Part Number: LM5023

Hi,

Please suggest how to change the switching frequency of LM5023 ic,

Now I soldered only controller part, I giving 14vdc  to aux winding diode cathode pin,

Output pin 7 get only 13.7V(high state only). I'm not getting the pulses.

getting this results.

Pin Number

Pin name

Voltage

1

QR

0V

2

VSD

650mV

3

SS

5.5V

4

COMP

5.85V

5

CS

0V

6

GND

GND

7

OUT

13.7V

8

VCC

13.7V

Regards,

Sathish

  • 0
    TI__Mastermind 31690 points

    Hello Satishkumar,

    Please see my reply to your previous posting on this topic. The LM5023 does not have a fixed frequency that can be easily changed by the user. It operates on variable self-oscillation depending on external power stage design.  

    Since this post is on the same topic as your previous post, and I have answered that one just now, I will close this post.

    Regards,
    Ulrich