Switching regulator for power supply with multiple output

Hello,

Thanks for reaching out, may I clarify if your system is operating in "60Hz and 50 Hz" or "60kHz and 50kHz"?

What are some features that you would prefer (cost, efficiency, packaging, primary or secondary side regulated...)?

These answers help us provide you the flyback solution that best fits your needs.

Best,

Claire

Hi Claire,

The operating frequency is 60Hz and 50 Hz.

Please see the response of our customer below.

The packaging must not exceed about 120mm x160mm, so I think it is not a big constraint.

I have a little space to dissipate any loss of performance above the integrated circuit so it's not a huge constraint so.

The integration destination is for an accurate audio device, so I'm concerned about input filtering and possible radiation, so in my opinion a chopping frequency around 130khz was a good compromise but not a certainly.

This product is intended for the US and European market, I was thinking about  it was possible to decrease input AC sector level to work with most integrated haching component.(I don’t know of any other way to do this, bt i regulary see this concept on other dioagrams)

The 48v/0.1A, 5V/1A and 3V/0.5A power supplies can be regulated later by conventional regulators, for the 12.6V/2.5A, the 15V/0.5a and the -15V/0.5A I think that 'it's best to keep the secondary level haching level..

I saw that there were circuits with burst mode (green mode). I'm not sure I want to integrate this technology or something that goes down in the audible level in all cases.

Maybe there is another backup mode in case of empty connectivity.

Regards,

Danilo

Hello Danilo,

Base on the overall output power needed I would recommend our medium power Zero Voltage Switching (ZVS) and Active Clamp Flyback (ACF) Controllers. 

• UCC28780: ACF flyback, high power density/efficiency solution with variable switching frequency up to 1MHz.
• UCC28781: ZVS flyback with direct SR control from primary side. High power density/efficiency solution with variable switching frequency up to 1MHz.
• UCC28782: ACF + ZVS flyback solution which support higher density/efficiency, but is also higher system cost (high side clamp is replaced by driver+FET to recover the leakage energy.

Best,

Claire