0
\$\begingroup\$

I have the microphone amplifier and line Powerpod 410 R that after an analysis I found that one of the output mosfets is in total short. The short mosfet is this IRFB23N20D, however I don't find it in my country Brazil, but I found this IRFB4227PbF. As I am new to amplifiers using mosfet, I asked for help, I have been reading the datashet of one and the other has some differences as the current supported my question is will I have problems replacing what I found in my country?

DATASHET's: IRFB23N20D IRFB4227PbF IRS2092

OBSERVATION: I'm sorry I use google translator, so I may not express myself well.

\$\endgroup\$
3
  • 1
    \$\begingroup\$ The link to the first MOSFET is down. We would need schematics of the Powerpod 410 R to make any decisions, or suggestions. \$\endgroup\$
    – user105652
    Commented Aug 16, 2020 at 4:00
  • 1
    \$\begingroup\$ ”I don't find it in my country X” Digi-Key, Mouser, Farnell ships all over the world except North Korea. \$\endgroup\$
    – winny
    Commented Aug 16, 2020 at 12:13
  • \$\begingroup\$ Okay, I already added the schematic on the post fixed the first link in the mosfet. The problem is the delay when any order arrives stays more than 1 month at customs. I can try to see some others but the closest I found was this one. \$\endgroup\$
    – Gabriel L S Saraiva
    Commented Aug 16, 2020 at 15:19

1 Answer 1

Reset to default
1
\$\begingroup\$

The IRFB4427 has lower ON resistance, but very high input/output capacitances. In a Class D audio amplifier, I would not replace the IRFB23N20 with it. Instead, you can use MOSFETs with similar I/O capacities and currents. (IRFB4020, IRFB5620, FQP19N20, RCX200N20)

\$\endgroup\$
12
  • \$\begingroup\$ You never really know what you're getting from aliexpress. I would recommend rather looking for devices with similar capacitances, because you definitely have a point that high FET capacitance would be a problem in a class-D amplifier. \$\endgroup\$
    – Hearth
    Commented Aug 16, 2020 at 11:40
  • \$\begingroup\$ In ali. i do not trust buy semi conductors there \$\endgroup\$
    – Gabriel L S Saraiva
    Commented Aug 16, 2020 at 15:18
  • 1
    \$\begingroup\$ You can also shop here quickly. \$\endgroup\$
    – csabahu
    Commented Aug 16, 2020 at 21:23
  • \$\begingroup\$ I'll wait for someone to see if I can use the one I found here, otherwise I care. Added schematic of amplifier in post \$\endgroup\$
    – Gabriel L S Saraiva
    Commented Aug 17, 2020 at 3:23
  • 1
    \$\begingroup\$ I see the difference in loss is 1.8W due to the higher resistance. So this is not significant. (The switching current is approx. 6A.) \$\endgroup\$
    – csabahu
    Commented Aug 17, 2020 at 17:28

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Not the answer you're looking for? Browse other questions tagged or ask your own question.