EMRFD Message Archive 2599

Message Date From Subject
2599 2009-01-17 15:39:51 ha5rxz Power Supply Heatsink Temperature

In an effort to cut down on noise levels I have fitted a variable
speed fan to the switched mode power supply that I use to power some
of my shack equipment. The old fan ran at full speed and kept the
heatsinks at 22 degrees C, the new fan can run very slow but at
minimum speed the heatsink temperature climbs to 68 C.

Can someone give me a rough guide of what a reasonable temperature
would be for the heatsink in a switched mode power supply?

HA5RXZ

2606 2009-01-18 07:01:46 Vojtech Bubnik Re: Power Supply Heatsink Temperature

> Can someone give me a rough guide of what a reasonable temperature
> would be for the heatsink in a switched mode power supply?

Temperature of 68 centigrades is certainly not healthy to low ESR
electrolythic capacitors. You will shorten life of your power supply.

73, Vojtech OK1IAK

2599	2009-01-17 15:39:51	ha5rxz	Power Supply Heatsink Temperature
Message	Date	From	Subject
In an effort to cut down on noise levels I have fitted a variable speed fan to the switched mode power supply that I use to power some of my shack equipment. The old fan ran at full speed and kept the heatsinks at 22 degrees C, the new fan can run very slow but at minimum speed the heatsink temperature climbs to 68 C. Can someone give me a rough guide of what a reasonable temperature would be for the heatsink in a switched mode power supply? HA5RXZ
2606	2009-01-18 07:01:46	Vojtech Bubnik	Re: Power Supply Heatsink Temperature
> Can someone give me a rough guide of what a reasonable temperature > would be for the heatsink in a switched mode power supply? Temperature of 68 centigrades is certainly not healthy to low ESR electrolythic capacitors. You will shorten life of your power supply. 73, Vojtech OK1IAK