Other Parts Discussed in Thread: TLVH431, TL431
Hello,
I am working with a customer on a power supply. We have some questions regarding error amplifiers. We're looking to produce a negative output voltage from a UCC2897A and use an external op-amp as the error amplifier.
They want to avoid the TL431/optocoupler combo because the output voltage is -50V and had to add quite a bit of extra circuitry to make it work. Since it is not an isolated output, an op-amp should do the job. They did try that approach using a TLVH431 and level-shifted its output with a higher-voltage transistor. They got some hybrid response of the control loop and the parasitics of the circuit. They would prefer to get back to the op-amp approach.
I’m not finding much documentation out there on setting up the error amplifier for this kind of output. Any advice on how to properly incorporate an external error amp with the UCC2897A?
Regards,
Ryan B.
