Hello,
I need to generate +/-15V from a 24V input. I came across PMP7941.2 reference design on LM5017 and use a modified LM5017ISOEVAL to generate +/-15V.
In case it matters, these rails are to power split supply transducer that generates +/-5V signal which will go to ADC (referenced on the same Ground)
Have a few questions regarding the application:
- I used the calculated value based on the calculated ratio for Rfbb and Rfbt but the output is lower than I expected under small load (2mA) condition. As such, I tailored it so that I get +/-15V under the same small load. When I simulate higher load (30-80mA), the output voltage changed to follow the output based on the calculated ratio. Does the calculated ratio for the regulation (V out) applies under load?
- I was trying to find any curve regarding the load regulation for this device but could not find it anywhere. Based on my initial test, the regulation on the primary output is approx. 150mV for 40-80mA load but the secondary output regulation is approx. 0.93 - 1.5V for the same load as the primary. Is this to be expected?
- Since the load on my intended application would be the same on both outputs (for the split supply transducer), the difference between the primary and secondary output is a bit of a concern. Is there a way to make the secondary output regulate a bit better?
Thanks
Samuel