Electronics > Projects, Designs, and Technical Stuff

Over driving a boost converter input

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TurboTom:
The UC384x variety is a current mode controller. In order for the control loop to work properly, it requires a valid signal on the current sense input (either sensed by shunt/current sensor or simulated by some R-C circuitry with an active switch). Just grounding the CS pin will result in something like 95...98% duty cycle all the time until the voltage setpoint is reached. No current limiting in the switch / inductor... Guess you know what that means  ;)

Yansi:
What are you complaining about TurboTom? The CS pin is correctly wired to the shunt.

aheid:
Silly question... You say you want the output to be 340V if input is 340V (220V AC). So couldn't you just bypass this whole circuit in that case?

TurboTom:
 :palm: Sorry, now I noticed  -  I interpreted the right-angled line at the tab to the CS pin to symbol ground. Different conventions in drawing schematics... Please disregard my post above.

Cheers,
Thomas

ali_asadzadeh:

--- Quote ---Silly question... You say you want the output to be 340V if input is 340V (220V AC). So couldn't you just bypass this whole circuit in that case?
--- End quote ---

There is no dumb question ;D how do you boost 12V to 60v and also bypass 340VDC in a circuit automatically then?

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