Step Up Module got fried

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hi
today fried 2 off step modules (like one: http://bit.ly/2vh4dxo). tried boost 12v 24v power mini humidifier. current flows close maximum limit, although worked 12v pb battery (was 12.50v). thought work 12v psu. couldn't keep 24v , made high hum noise. after 10 seconds chip on step module went in smoke , fire. mosfet (irf540n) got hot. after thought it  faulty module , connected step module directly 12v power source. 1 went ip in flames faster. i'm curious reason why module works on 12v battery, not on 12v psu. maybe of guess why happened. thank help.

more details:
psu rated @ 12v @10a

battery ~12.5v

humidifier works fine on 24v power source , uses 0.6a. rated ac , dc. mosfet stays cool.

step modules have input current limit, may not exceed. consult chip data sheet.

to produce 24v @ 0.6a requires 12v @ more 1.2 a, taking account conversion efficiency.


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