UC1843B-SP: parts selection and topology suggestions

Hey Erik,

Is this isolated or non-isolated for the topology?

Thanks,
Daniel

non-isolated

Hey Erik,

Can it be two separate supplies than?

The TPS7H4010-SEP would be able to do a 12 -> 5 V and a 12-> -5 V

Otherwise a controller like the UC1843B-SP as a non-isolated flyback would work.

Thanks,
Daniel

it can be two separate supplies.  I wasn't sure if the TPS7H4010-SEP could be used to generate a negative output voltage.  Is there an app note that discusses that configuration?  For the UC1843B-SP, is there a TINA-TI spice schematic available?

Hey Erik,

The TPS7H4010-SEP can be used to generate a negative voltage the app note location is below:

https://www.ti.com/lit/an/snvaa76/snvaa76.pdf

The UC1843B-SP does have a TINA spice schematic see below:

UC1843A-SP_TINA_TRANS.zip

Thanks,
Daniel

Thanks!  I'll have to see if the SEP meets our radiation requirements.  The UC1843A spice model says it can't be used in an inverting topology.  So I guess I wouldn't be able to simulate the -5V circuit?

Daniel:  are there any app notes or reference designs showing a flyback non-isolated converter topology with positive input voltage and negative output voltage?