MOS

Oct 12, 2004 2 Replies
:

Hi! I ask you an advice witch MOS to use for pwm (20Khz) signal to my load (Peltier cell) on 15V 7A I run it with IRLZ14 but crashed in 2 weeks. (I think caused from power dissipation anyhow I mounted heat sink for TO220)



Thanks,



Marco


p.s. sorry for my english, but I'm foreign :)


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M

":: Marcolino ::" schrieb im Newsbeitrag news:h4Sad.37069$ snipped-for-privacy@twister2.libero.it...

The IRLZ14 is fine, but you have to drive it's gate really hard. Lot of current needed, so no series resistor, better use a MC34151 MOSFET driver.

Manfred Winterhoff, reply-to invalid, use mawin at despammed.com homepage: http://www.geocities.com/mwinterhoff/ de.sci.electronics FAQ: http://dse-faq.elektronik-kompendium.de/ Read 'Art of Electronics' Horowitz/Hill before you ask. Lese 'Hohe Schule der Elektronik 1+2' bevor du fragst.
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R

Do you apply the 20 kHz directly to the Peltier? It would be better, for the sake of efficiency, to use a "real" switched mode power supply. Heat pump effect goes linearily with current, however, Ohmic losses increase with I^2. Maximizing I whilst minimizing RMS(I) calls for DC ;-).

ditto

mfg Rolf Bombach
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