Power Management ICs Forum Discussions

I am reviewing an old design for a spectral lamp power supply.  Spectral lamps are a type of arc lamp that are rated 10W to 60W at 1A, made by Osram.   The power supply, is traditionally 50Hz mains choke and a florescent tube starter.  Spectral lamps do not have a heater but start with a voltage of less than 1,500V briefly, then run at high voltage vaporising a metal or causing a gas to ionise flouress.

I developed a switch mode power supply 30 years ago which ran well the lamps' life went way beyond what was expected of it and the quality of the light was much better because there was virtually no flicker, so it was used with electronic devices.   But the transistor and inductor losses were higher than would be possible now with a zero current or zero voltage switching controller.   There was no power factor correction, and the power supply only operated with 230Vac, though it would run at much lower voltage with the lower power lamps.

XDPS2201 seems to run with a variable PWM and current mode, similarly to the circuit I have drafted on my blog.   I believe this part would run similarly to UC3806 in my blog.

https://blog.andrew-lohmann.me.uk/2018/07/electronics-high-frequency-arc-lamp.html

I am also considering high frequency fluorescent tube ballast's and using variable frequency for lamp current regulation.  I have drafted a design using chokes rather than chokes and a transformer.  The arc would be struck with L1 C12 at about 28KHz.  Then run at 128KHz or higher when L2 C12 resonate.   I have not worked these out properly, but the circuit could output a higher voltage than the incoming voltage, which I have modelled a little on the blog.

https://drive.google.com/file/d/1wPdIDxCzWKhlYY9-XM0649uTIHABm-Ua/view?usp=sharing

My question is am I on the right track by considering this controller?

Hi,

i am setting a AMD SVI2 Vboot Option like a below Picture.

But, i am not sure PowIRCenter SVC & SVD setting for loop1, 2 is correct setting for AMD-SVI2 0.9V like a below picture

also, MTP Boot Register Address is not descripted in datasheet. 

So,

1. Is AMD SVI2 0.9V Vboot Option Setting(Uploaded Picture) Correct?

2.  MTP Boot Register is not shown in datasheet, what is The Address in IR35204

Thank you

Hi all,

We would like to measure the phase margin at EVAL_TDA38740_3.3VOUT.

Could you please check if the attached method is correct?

If it is not correct, please tell me how to measure it.

If you have the phase margin of EVAL_TDA38740_3.3VOUT, please provide it for us.

Best regards,
MS

Hello,

TLF35584Q is a commonly used SBC , which frequently is combined with AURIX processors.

But I could not find a reference manual regarding configuration via SPI.

Many thanks for your support!

Hi all,

We are evaluating EVAL_TDA38740_3.3VOUT.

Is the vout_ov_fault_limit valid when the disable_relative_ovp is “1”?

Best regards,
MS