Alternative NMOSFET for SSR?
A friend has recommended Toshiba TPH1R306PL, which features just above 1mOhm Rdson, 100A IDmax and 60V Vdssmax. Accuphase use this MOSFET to switch their E-800 Class-A Amps' Outputs.
What's the evaluation of the device here for Class AB Powerstages?
Greetings,
Winfried
A friend has recommended Toshiba TPH1R306PL, which features just above 1mOhm Rdson, 100A IDmax and 60V Vdssmax. Accuphase use this MOSFET to switch their E-800 Class-A Amps' Outputs.
What's the evaluation of the device here for Class AB Powerstages?
Greetings,
Winfried
SSR board problem
Recently I assembled two boards for speaker protection ,first one from post #95 posted by Prasi and this work as it should .Then I was ordered some boards from JLCPCB using gerbers from post #100. I assembled one board and I have 2 problems. First there is no turn on delay ,the board start immediately. Second problem is greater and more important ,the board power up and works
about minute or two ,then goes to protect mode. Sometimes the green led flicker sometimes not. Turning board off and on again helps for some seconds, then board go to protection again. Components are as in schematics except D7
and D8 ,they are UF4007 not MUR160.All components are from Mouser or
Farnell so no fakes
.Can anybody helps me to solve this problem?
Regards
zoky2
Recently I assembled two boards for speaker protection ,first one from post #95 posted by Prasi and this work as it should .Then I was ordered some boards from JLCPCB using gerbers from post #100. I assembled one board and I have 2 problems. First there is no turn on delay ,the board start immediately. Second problem is greater and more important ,the board power up and works
about minute or two ,then goes to protect mode. Sometimes the green led flicker sometimes not. Turning board off and on again helps for some seconds, then board go to protection again. Components are as in schematics except D7
and D8 ,they are UF4007 not MUR160.All components are from Mouser or
Farnell so no fakes
.Can anybody helps me to solve this problem?Regards
zoky2
Attachments
From Post 100,
https://www.diyaudio.com/forums/solid-state/318946-ssr-speaker-protection-10.html#post5776638
Did anyone ever build Prasi's through hole protect board?
LKA i will use your Protection with Apex SR200 with 65V-70V PS.
i will use IPI051N15N5AKSA1 Mosfet. Please could you confirm that R4 is the only change and also, could you suggest a heatsink for T6 who will fit on your PCB.
The APEX SR200 use RE=0.33R so Ith=1V/0.33R=3Ap, do i need RS2? i will use RS1=100R.
Attachments
Those fets are out of stock and expensive.
Any alternative available and cheap?
What about thisToshiba TK56E12N1?
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For SSR applications, look for Trench technology mosfet devices. Laterals and verticals are not the right technology for this application.
For an alternative to the Infineon devices, look at Nexperia PSMxxxxx. Fairchild (now ON) also have a good range for this application. Remember to look at the energy handling capability of the devices as well. In the off condition, no power is dissipated, and in the ON condition, provided Rds(on) is low enough and the drive sufficient, only a little bit of power is dissipated. However, the energies during the switching event can be quite high if the device is conducting high currents, so you really want to switch in < 100 us.
I put a picture up a few years ago of the SSR on one of my commercial amps switching 60 A in about 80 us
For an alternative to the Infineon devices, look at Nexperia PSMxxxxx. Fairchild (now ON) also have a good range for this application. Remember to look at the energy handling capability of the devices as well. In the off condition, no power is dissipated, and in the ON condition, provided Rds(on) is low enough and the drive sufficient, only a little bit of power is dissipated. However, the energies during the switching event can be quite high if the device is conducting high currents, so you really want to switch in < 100 us.
I put a picture up a few years ago of the SSR on one of my commercial amps switching 60 A in about 80 us
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I do not recommend going for more than 50V power supply (SSR2). The protection is designed for max 200W/4R. I have a new PCB layout (SSR3), a larger heatsink (PSU up to 60V), three options for the optodriver (VOM1271, ASSR-621, Si8752). A prototype PCB is on the way, as soon as I verify the functionality, I can publish it.
