TIDA-00381: TIDA-00381 PWR050A VIN_MON 400V=1.93V or 1.5V

SUN Chao

Part Number: TIDA-00381

HI TI Experts

In TIDA-0038,the PWR050A written that the VIN_MON 400V=1.93V,but in the PWR050A SCH ,that written 400V=1.5V，Please help me to make sure which one is right? How to calculate the VIN MON GAIN? Thank you !

over 1 year ago

0 Ian Bower over 1 year ago

TI__Genius 17090 points

I'll forward this to our expert.

0 Sean Xu over 1 year ago in reply to Ian Bower

TI__Genius 13570 points

Hello,

VIN_MON 400V=1.93V is based on ideal calculation with ideal sampling and hold. But the circuit averages input voltage with DC value, 1.5V corresponds to 400Vin actually.

Regards,
Sean

0 SUN Chao over 1 year ago in reply to Sean Xu

Prodigy 100 points

Hello,

Thank you for you kindly reply.

How about VIN_MON 300V=?

How to calculate the gain that VIN_MON =?

Thank you very much!

0 Sean Xu over 1 year ago in reply to SUN Chao

TI__Genius 13570 points

Hello,

I expect VIN_MON = 1.12V when Vin = 300V.

Regards

0 SUN Chao over 1 year ago in reply to Sean Xu

Prodigy 100 points

Hi ，

could you tell me how to calculate the gain between VIN_MON and Vin？ When Vin=450VDC ,VIN_MON =？

+1 Sean Xu over 1 year ago in reply to SUN Chao

TI__Genius 13570 points

Hello,

Here is the aux transformer turns ratio. The transformer part number is GA358. Pri:Sense = 1:0.079. Another voltage divider is from: R16 and R14. N = R14/(R14 +R16). Then you can calculate the sensed voltage,

0 SUN Chao over 1 year ago in reply to Sean Xu

Prodigy 100 points

Thank you very much!

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TIDA-00381: TIDA-00381 PWR050A VIN_MON 400V=1.93V or 1.5V