Replace IRF540 in IRFZ44

Dj BASS AMP · 26th August 2004, 11:42 PM

i have a car JBL monoblock amp. and the power supply is build from IRF540. and i have new IRFZ44.
can i put IRFZ44 in place the not good IRFZ44.

úîéø

Nelson Pass · 26th August 2004, 11:53 PM

Obviously you already have the Z44, and in the time it took
you to pose the question you could have soldered it in and told
us about what happened, and then we'd all really know.

bowdown · 27th August 2004, 02:50 AM

The IRFZ44 is 60V, and 50amp @25 degrees C and the IRF540 is 100V and 28amp @25 degrees C. Hope that helps in some way.

Regards

Bowdown

Eva · 27th August 2004, 03:35 AM

Are you sure those IRF540s are part of the power supply?

IRFZ44 has lower input capacitance [no need to change gate drive], similar output capacitance [no need to change RC damping networks] and much lower Rds-on so it will be a great replacement for IRF540 in any 12V push-pull SMPS

Anyway, all car-audio amplifiers I've seen using IRF540 for SMPS were essentially worthless. Apparently those amplifier designs had undergone so extreme cost reduction processes that manufacturers didn't hesitate to save some more cents of dollar by using IRF540 instead of IRFZ34 or IRFZ44 on the SMPS

[JBL has been applying severe cost and quality reduction policies to its car audio market for some years]

Dj BASS AMP · 27th August 2004, 07:02 AM

TANKS !

so i will put a IRFZ44....

Upupa Epops · 27th August 2004, 12:46 PM

Don't do it, it is quite pointles work, nothing will be change

. Save up time ( better is spend it with your girlfriend

).

Dj BASS AMP · 27th August 2004, 02:01 PM

OOOooo......

it is a secend time that i fix the power supply...

OK so i will buy a new IRF540.... (8)

IVX · 27th August 2004, 09:08 PM

<OK so i will buy a new IRF540.... >
No way! "better is spend it with your girlfriend "
I fully agree Eva's opinion, exclude the cost comparison - irfz44 cheaper then irf540, and the irf540n cost close to irf3205 even, which 110A@25c 55V!

Upupa Epops · 27th August 2004, 09:24 PM

Result with both types will be the same, so use cheaper ones

- Eva, if is driving stage designed for higher input capacity ( what certainly is ), is lower capacity of new ones for nothing !

Eva · 27th August 2004, 09:27 PM

Oh, IRFxx prices vary a lot over time and depending on the quantity and procedence of the devices, but as an exmaple, when some chinese car amplifier manufacturer has 10.000 IRF540 in stock and there is no demand for MOSFET output stages it's allways cheaper to use them for SMPS than to buy another 10.000 IRFZ34 or IRFZ44 and eat the 10.000 IRF540 with potato chips

26th August 2004, 11:42 PM	#1
Dj BASS AMP Account Disabled Join Date: Jul 2002	Replace IRF540 in IRFZ44 i have a car JBL monoblock amp. and the power supply is build from IRF540. and i have new IRFZ44. can i put IRFZ44 in place the not good IRFZ44. úîéø

27th August 2004, 09:08 PM	#8
IVX diyAudio Member Join Date: Jul 2003 Location: Everywhere (Buddhist's context)	<OK so i will buy a new IRF540.... > No way! "better is spend it with your girlfriend " I fully agree Eva's opinion, exclude the cost comparison - irfz44 cheaper then irf540, and the irf540n cost close to irf3205 even, which 110A@25c 55V! __________________ Best regards, E1.

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26th August 2004, 11:53 PM	#2
Nelson Pass The one and only Join Date: Mar 2001	Obviously you already have the Z44, and in the time it took you to pose the question you could have soldered it in and told us about what happened, and then we'd all really know.

27th August 2004, 02:50 AM	#3
bowdown diyAudio Member Join Date: Feb 2004 Location: Perth	The IRFZ44 is 60V, and 50amp @25 degrees C and the IRF540 is 100V and 28amp @25 degrees C. Hope that helps in some way. Regards Bowdown

27th August 2004, 03:35 AM	#4
Eva diyAudio Member Join Date: Oct 2003 Location: Near the sea	Are you sure those IRF540s are part of the power supply? IRFZ44 has lower input capacitance [no need to change gate drive], similar output capacitance [no need to change RC damping networks] and much lower Rds-on so it will be a great replacement for IRF540 in any 12V push-pull SMPS Anyway, all car-audio amplifiers I've seen using IRF540 for SMPS were essentially worthless. Apparently those amplifier designs had undergone so extreme cost reduction processes that manufacturers didn't hesitate to save some more cents of dollar by using IRF540 instead of IRFZ34 or IRFZ44 on the SMPS [JBL has been applying severe cost and quality reduction policies to its car audio market for some years]

27th August 2004, 07:02 AM	#5
Dj BASS AMP Account Disabled Join Date: Jul 2002	TANKS ! so i will put a IRFZ44....

27th August 2004, 12:46 PM	#6
Upupa Epops diyAudio Member Join Date: Aug 2003 Location: Prague,Czech Republic	Don't do it, it is quite pointles work, nothing will be change . Save up time ( better is spend it with your girlfriend ).

27th August 2004, 02:01 PM	#7
Dj BASS AMP Account Disabled Join Date: Jul 2002	OOOooo...... it is a secend time that i fix the power supply... OK so i will buy a new IRF540.... (8)

27th August 2004, 09:24 PM	#9
Upupa Epops diyAudio Member Join Date: Aug 2003 Location: Prague,Czech Republic	Result with both types will be the same, so use cheaper ones - Eva, if is driving stage designed for higher input capacity ( what certainly is ), is lower capacity of new ones for nothing !

27th August 2004, 09:27 PM	#10
Eva diyAudio Member Join Date: Oct 2003 Location: Near the sea	Oh, IRFxx prices vary a lot over time and depending on the quantity and procedence of the devices, but as an exmaple, when some chinese car amplifier manufacturer has 10.000 IRF540 in stock and there is no demand for MOSFET output stages it's allways cheaper to use them for SMPS than to buy another 10.000 IRFZ34 or IRFZ44 and eat the 10.000 IRF540 with potato chips

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