Trying to identify SMD with label scrubbed off - PWM, inverter, 100W 12VDC to 120VAC modified sine wave

John Robertson · 2021-08-06T01:05:45+00:00

I have a trick on-topic question, looking for possibilities for candidates for a 16-pin SMD device that has these pin outs identified so far:1 & 16 - RC oscillator4 - ground7 & 8 - drivers for a "H" style MOSFet set of four transistors that between them generate a modified sine wave running at 60Hz and 120V.So it is NOT a TI SG3524/3525 chip.The MOSFets generate the power from the output of a small 12V to 120VAC switching transformer which generates the raw 120VDC or so source for the modified sine wave output. The transformer also appears to be driven by the IC in question above via another pair of MOSFets. Or it may simply be a relaxation oscillator with feedback whose job is simply to keep the output at 120VDC load or no load. If overloaded I expect is simply shuts down.Why am I doing this you may ask?I want to identify the IC so I can make the output frequency adjustable without changing the output voltage - this has applications in my jukebox field you see...Why not simply make my own adjustable inverter? Well, this unit is cheap, already in a package with a fan, and is rather common I suspect - so easy for me to buy up a few to see if there actually is a market for my idea. If there isn't I'm only out a few hours of time and a few hundred dollars at most in parts. If this works then I'll go the design route and make something chat I can scrape the numbers off...Thanks for any suggestions of ICs to consider,John :-#)#

Aug 06, 2021 Last reply: 2 years ago 22 Replies

Rate this thread:

boB 4 years ago

At what DC input voltage ? The clamp time will depend on battery voltage to regulate the output to the proper RMS voltage.

boB

Vote

Phil Allison 4 years ago

=======================

** Wot thing ?????

Some phantom growing inside your head?

** DC to AC supply inverters need to work satisfactorily with all common loads.

That is WHY square wave ones are simply NOT in the game.

They cannot comply with both the rule I posted.

...... Phil

Vote

legg 4 years ago

Bapdas Model MT-MX150W

Vote

Join the Discussion

Have something to add? Share your thoughts — no account required.

Didn't find your answer?

Ask the community — no account required