« previous next »
Pages: [1]   Go Down

Author Topic: 1300w SMPS for amplifier, self oscilating, with unknown mosfets  (Read 693 times)

0 Members and 1 Guest are viewing this topic.

Offline lazymanTopic starter

  • Contributor
  • Posts: 11
  • Country: cs
1300w SMPS for amplifier, self oscilating, with unknown mosfets
« on: July 14, 2021, 10:23:36 am »
Hi,

I am trying to repair SMPS and amplifier. Made in china, with deleted markings from mosfets and ics. I know its based on some old self oscilating design, got it working with IRF840.

Problem is, amplifier is declared 1300w at 4 ohms, has 7 pairs output transistors with 4 mosfets step driver, in class H.

Died on generator, probably overvoltage, burned mov and exploded capacitors.

I need help to indentify proper replacement mosfets for this power.








Logged
 

Offline lazymanTopic starter

  • Contributor
  • Posts: 11
  • Country: cs
Re: 1300w SMPS for amplifier, self oscilating, with unknown mosfets
« Reply #1 on: August 30, 2021, 01:59:43 pm »
Maybe this can be of help. I cant find modern mosfet with such low treshold voltage and this big die. Treshold voltage is main problem
Logged
 

Offline lazymanTopic starter

  • Contributor
  • Posts: 11
  • Country: cs
Re: 1300w SMPS for amplifier, self oscilating, with unknown mosfets
« Reply #2 on: August 30, 2021, 02:09:39 pm »
IRFP460N works, but i suppose its not good for 1300w.
Logged
 
Pages: [1]   Go Up
« previous next »

Share me

Digg  Facebook  SlashDot  Delicious  Technorati  Twitter  Google  Yahoo
Smf

 


EEVblog Main Site EEVblog on Youtube EEVblog on Twitter EEVblog on Facebook EEVblog on Odysee