sanyo chip amps v,II,xI differences

jimmy audio · 20th July 2010, 03:18 PM

I am building a 3 channel power amp for my screen porch (left, right and sub) and want to use sanyo modules. my question is what is the difference between the v,II,XI designations? there is quite a price difference. I would like to use stk4044(100w) for the left and right and stk4050 (200w) for the sub. that should be enough power to give the neighbors a stroke!! any help would be appreciated. thanx

StevenOH · 20th July 2010, 05:16 PM

See PM.

dlk666 · 21st August 2011, 05:59 PM

hi, could you please tell me what the difference s between the 4050 I II and V

jimmy audio · 23rd August 2011, 03:50 PM

As far as i know 4050 only comes as the"v" model. in the other stk series chips the I II and v designation refers to better thd numbers.

sregor · 24th August 2011, 01:43 AM

Hopefully they didn't do the same as in the STK30X2 ( STK3042, STK3062, STK3082. STK30102 ) driver chip series. Later versions lacked internal compensation circuits (caps and resistors) so had to check the data sheets very carefully to see what was needed to add to the circuits. (or suffer from serious oscillation) Good luck.

prairiemystic · 24th August 2011, 03:00 AM

Steve, what was wrong with the STK30x2 etc. drivers? I have the original datasheets and the VAS compensation is a bit weird.

sregor · 25th August 2011, 01:50 AM

Nothing is wrong with them but - the original version has internal compensation caps and resistors between pins 3-4, 12-13, 4-6, and 10-12. The type ii are functionally equivalent, except there isn't a resistor and cap between 3-4 and 12-13 and in the type iii all are not there. So if subbing for a type i, with a type ii need to add an R-C in each channel, and when using a type iii need to add an R-C and a second C. Use the values in the test circuit in the type iii data sheet (68 pF + 470 ohm for the RC, 15 pF for the C) and amp won't oscillate.

dlk666 · 19th September 2011, 06:50 PM

Hi guys can anyone help me out? More or less how many degrees per watt should the heatsink for a single STK4050 be?

pacificblue · 20th September 2011, 07:02 PM

Depends on the rail voltage, load impedance, ambient temperature and whether the heatsink is outside or inside of the amplifier case.

jimmy audio · 21st September 2011, 12:35 AM

Pacific blue is correct many variables exist but as a rule of thumb ic power dissipation is equal to 1/10Po max for real world applications. thermal resistance is 1.2deg C/W. Total power dissipation on a stk4050v chip is around 240 watts. Of course when it comes to heatsinks bigger is better. good luck

20th July 2010, 03:18 PM	#1
jimmy audio diyAudio Member Join Date: Jul 2010 Location: northern minnesota	sanyo chip amps v,II,xI differences I am building a 3 channel power amp for my screen porch (left, right and sub) and want to use sanyo modules. my question is what is the difference between the v,II,XI designations? there is quite a price difference. I would like to use stk4044(100w) for the left and right and stk4050 (200w) for the sub. that should be enough power to give the neighbors a stroke!! any help would be appreciated. thanx

20th July 2010, 05:16 PM	#2
StevenOH diyAudio Member Join Date: Jun 2004 Location: USA	See PM. __________________ The truth is out there. Who can handle the truth?

24th August 2011, 01:43 AM	#5
sregor diyAudio Member Join Date: Jan 2006 Location: massachusetts	Hopefully they didn't do the same as in the STK30X2 ( STK3042, STK3062, STK3082. STK30102 ) driver chip series. Later versions lacked internal compensation circuits (caps and resistors) so had to check the data sheets very carefully to see what was needed to add to the circuits. (or suffer from serious oscillation) Good luck. __________________ Steve

25th August 2011, 01:50 AM	#7
sregor diyAudio Member Join Date: Jan 2006 Location: massachusetts	Nothing is wrong with them but - the original version has internal compensation caps and resistors between pins 3-4, 12-13, 4-6, and 10-12. The type ii are functionally equivalent, except there isn't a resistor and cap between 3-4 and 12-13 and in the type iii all are not there. So if subbing for a type i, with a type ii need to add an R-C in each channel, and when using a type iii need to add an R-C and a second C. Use the values in the test circuit in the type iii data sheet (68 pF + 470 ohm for the RC, 15 pF for the C) and amp won't oscillate. __________________ Steve

20th September 2011, 07:02 PM	#9
pacificblue diyAudio Member Join Date: May 2008	Depends on the rail voltage, load impedance, ambient temperature and whether the heatsink is outside or inside of the amplifier case. __________________ If you've always done it like that, then it's probably wrong. (Henry Ford)


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21st August 2011, 05:59 PM	#3
dlk666 diyAudio Member Join Date: Jul 2011	hi, could you please tell me what the difference s between the 4050 I II and V

23rd August 2011, 03:50 PM	#4
jimmy audio diyAudio Member Join Date: Jul 2010 Location: northern minnesota	As far as i know 4050 only comes as the"v" model. in the other stk series chips the I II and v designation refers to better thd numbers.

24th August 2011, 03:00 AM	#6
prairiemystic diyAudio Member Join Date: Jul 2004 Location: Edmonton, AB Canada	Steve, what was wrong with the STK30x2 etc. drivers? I have the original datasheets and the VAS compensation is a bit weird.

19th September 2011, 06:50 PM	#8
dlk666 diyAudio Member Join Date: Jul 2011	Hi guys can anyone help me out? More or less how many degrees per watt should the heatsink for a single STK4050 be?

21st September 2011, 12:35 AM	#10
jimmy audio diyAudio Member Join Date: Jul 2010 Location: northern minnesota	Pacific blue is correct many variables exist but as a rule of thumb ic power dissipation is equal to 1/10Po max for real world applications. thermal resistance is 1.2deg C/W. Total power dissipation on a stk4050v chip is around 240 watts. Of course when it comes to heatsinks bigger is better. good luck

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