Feedback on HLK-PM01 AC to DC circuit

Thread Starter

ilium007

Joined Aug 24, 2013
112
Hi - just looking for some feedback on a 240VAC to 5VDC to 3.3VDC circuit using the HLK-PM01.

I see a lot of designs using electrolytic capacitors for the HLK-PM01 output, not sure if I should be using these or ceramics. The AP2112K 3.3V linear regulator uses ceramic capacitors on its output. Is this correct?

What about the capacitor values? I will be using the 3.3VDC to run an ESP8266 and the 5VDC for relay coils.

1602664369385.png
 
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Thread Starter

ilium007

Joined Aug 24, 2013
112
Yeah, just a typo. Wasn’t meant to be tied like that. I’ll fix diagram and repost so no one does anything silly.
 
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Thread Starter

ilium007

Joined Aug 24, 2013
112
I have switched thinking and now looking at the 5V 1A HLK-5M05 AC-DC converter.

I need some advice on sizing the MOV or if I should even be using an MOV vs a TVS diode. I am reading things about MOV's catching fire in peoples walls and roofs.

In Australia we have 240VAC 50Hz (our nominal voltage is around 253VAC shown on our digital meter). Thats RMS, 353VAC peak to peak.

Can anyone help with some advice on voltage supression components and best practice?

HLK-5M05 datasheet attached.

1603011258826.png

It seems like TVS diodes are replacing MOV's:

1603018929961.png
 

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Thread Starter

ilium007

Joined Aug 24, 2013
112
I have narrowed down to the V275LA20AP. Just want to confirm this will be suitable for 240VAC. The table below works from AC RMS which, here in Australia, is a nominal 240VAC.

1603279133184.png
 

DickCappels

Joined Aug 21, 2008
6,659
Yes, probably ok. A 15% margin should make for good protection of things connected to the mains yet plenty far above what the mains's maximum is thought to be.

Its usually 240 VAC ± a few volts here and I have been using 275 Varistors here for about 14 years and though there are many problems with poorly installed fixtures and components, the varistors have been been fine, even in the presence of raging thunder storms.
 

Thread Starter

ilium007

Joined Aug 24, 2013
112
Yes, probably ok. A 15% margin should make for good protection of things connected to the mains yet plenty far above what the mains's maximum is thought to be.

Its usually 240 VAC ± a few volts here and I have been using 275 Varistors here for about 14 years and though there are many problems with poorly installed fixtures components, the varistors have been been fine, even in the presence of raging thunder storms.
Great thanks, I'll move ahead with the PCB design now.
 
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