| 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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