>
>Further diagnosis revealed the MOSFET is not turning fully on; given a
>stable 5V gate voltage, it still reached 440C at 120C ambient.  Given
>the drain voltage of 14V, it was happy and ran cool; 270C.

                                            ^^^^^^^^^^^^^^

THIS IS COOL???????

Calvin




>
>I'll go buy ten logic-level MOSFETs.  Any Australians know a good, cheap
>source of these things?  Not rich enough to try Farnell yet, though
>they do list the IRLZ24 and IRL540 mentioned by Ron Fial.
>
>http://www.ozemail.com.au/~oatley lists a 2SK2175 which they claim is
>logic-level, http://www.st.com/ equates it with one of their logic-level
>devices.  Where would I look for data on 2SK2175?  Recommendations
>welcome for a good searching site.
>
>I think I'll try a lower PWM frequency though; be kinder to any other
>equipment nearby like radios.
>
>--
>James Cameron                              (james.cameron@digital.com)
>Digital Equipment Corporation (Australia) Pty. Ltd. A.C.N. 000 446 800
>