Hi !
It would not work. The 1.3a has a RFP30N06LE MOSFET with 47mOhms on resistance. Thermal Resistance Junction to Ambient is 80K/W.
200W Heatbed means 17A bed current at 12V. This gives you 12W thermal power loss at the MOSFET which means without additional heatspreader it results in theoretical >900°C at the package which definitely kills your MOSFET.
I'd recommend to replace the MOSFET with a type that has sufficient lower on resistance.
An option could be the pin compatible BUK954R4-80E from NXP, Farnell No. 2254217 it has a thermal power loss of approx. 1W which results in a device temperature of ~80°C which is 90°C lower than the allowed max. temperature.
Another one can be the sup90n03 from Vishay or SUP90N04-3m3P, SUP85N03-3m6P both also from Vishay and pin compatible. All of them need no additional heatspreader.
Hope that helps!
It would not work. The 1.3a has a RFP30N06LE MOSFET with 47mOhms on resistance. Thermal Resistance Junction to Ambient is 80K/W.
200W Heatbed means 17A bed current at 12V. This gives you 12W thermal power loss at the MOSFET which means without additional heatspreader it results in theoretical >900°C at the package which definitely kills your MOSFET.
I'd recommend to replace the MOSFET with a type that has sufficient lower on resistance.
An option could be the pin compatible BUK954R4-80E from NXP, Farnell No. 2254217 it has a thermal power loss of approx. 1W which results in a device temperature of ~80°C which is 90°C lower than the allowed max. temperature.
Another one can be the sup90n03 from Vishay or SUP90N04-3m3P, SUP85N03-3m6P both also from Vishay and pin compatible. All of them need no additional heatspreader.
Hope that helps!