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Class D Switching Power Amplifiers and Power D/A conversion

Sure Electronics AA-AB33182 Temperature
Sure Electronics AA-AB33182 Temperature
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Old 5th December 2016, 10:40 PM   #1
mobyd is offline mobyd  New Zealand
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Default Sure Electronics AA-AB33182 Temperature

If you look at the specs for these rather handy little 4x100w amps you see they are rated for an operating temperature of 0Cmin, 20Ctyp and 50Cmax. Question is what does this temperature relate to?. Heatsink temperature or ambient temperature. On a stinking hot day (35C) it doesn't take much pushing to get the heatsink temp over 50C. I notice that the STA508 chip these use has a operating range to 90C and athermal alert output that triggers at 130C.
Where does the 50C come in?.
M
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Old 5th December 2016, 10:51 PM   #2
rayma is offline rayma  United States
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Quote:
Originally Posted by mobyd View Post
If you look at the specs for these rather handy little 4x100w amps you see they are rated for an operating temperature of 0Cmin, 20Ctyp and 50Cmax. Question is what does this temperature relate to?. Heatsink temperature or ambient temperature.
That's the ambient temperature. Hope your local temp doesn't get to 122F.
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Old 5th December 2016, 11:05 PM   #3
doctormord is offline doctormord  Germany
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Yeah, always ambient, free air. If fit in an enclosure, you may/will hit the limits earlier.
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