Power management

Power management forum

State
Locked Locked
Replies 5 replies
Subscribers 63 subscribers
Views 175 views
Users 0 members are here

Support feedback

Options

Options

Related

UC1843B-SP: Rt/Ct not oscillating

Zachary Peavy

Prodigy 10 points

Part Number: UC1843B-SP

I am making a boost converter in Orcad, but the Rt/Ct is not Oscillating (only a flat line at 5V). I have 25v VCC, Gnd connected and RT/CT connected exactly like below with R= 1.73k and C= 1200pF. I am measuring at the RT/CT pin. Is it the model or am I doing something incorrectly?

over 1 year ago

0 Daniel Hartung over 1 year ago

TI__Mastermind 28455 points

Hey Zach,

I am seeing similar issues to what you are seeing.
This model is quite old so let me look to see if we have a fix available.

Thanks,
Daniel

0 Zachary Peavy over 1 year ago in reply to Daniel Hartung

Prodigy 10 points

Thanks, Daniel! Have you had any luck finding a fix yet?

0 Daniel Hartung over 1 year ago in reply to Zachary Peavy

TI__Mastermind 28455 points

Hey Zachary,

I'm still working out all the problems, but I have had some luck setting the initial conditions to 0 in the simulation:

Thanks,
Daniel

0 Zachary Peavy over 1 year ago in reply to Daniel Hartung

Prodigy 10 points

Hey Daniel, is there a corrected model available?

0 Daniel Hartung over 1 year ago in reply to Zachary Peavy

TI__Mastermind 28455 points

Hey Zach,

The problem would be with your set-up not the model.
Were you able to test the fix?

Thanks,
Daniel