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This 300W LPSU has a completely new design for the 19V and 12V high current rails.  Improvements to the 200W LPS include


1: 8pcs  ST Micro TiP35C for 19V Rail and 8pcs for 12V Rail.

This is a major step up from 3pcs for 19V and 12V rail on the 200W LPSU. (250% increase). Each TiP35C only need to take 20-30W load at peak unlike 70-80W in the 200W LPSU.


2: Side Aluminum Heatsink on the 300W LPSU is 50% bigger than the 200W LPSU and weight also increase from 7kg to 10kg for the whole unit. The new 300W LPSU side heatsink also features Fin in Fin design which greatly increase the heat dissipation area.


3: The diode bridge rectifier for 19V and 12V high current rail in the 200W LPSU has been replaced by Schottky Rectifier circuit. This is a major change and will eliminate the rectifier overheating/smoke issue from the 200W LPSU.


4: High precision over current and over temperature protection circuit is achieved by using TI LM2904 OP AMP and MCU control chip with customized software. This protection circuit is highly accurate, responsive, and reliable.


5: Super large 10000uf ELNA audio cap is used. One super cap for each rail. This design prevents potential phase distortion which could be the result from using multiple caps for a single rail. 


6: Two LT3045 based adjustable rail max current has been increased from 2A to 3A per rail by adding two additional LT3045 for each rail. This is a 50% increase. 12pcs LT3045 are used in 300W LPSU compare to 8pcs in the 200W LPSU.


7. Over temperature protection is added to the 300W LPSU. The cut-off temperature is set at 80C. Based on our test, 300W LPSU board temperature won't exceed 75C when 19V or 12V rails runs at their max allowed 13A peak for a consecutive week.


Further details at https://hdplex.com/hdplex-fanless-300w-linear-power-supply-for-pc-audio-and-ce-device.html

NUC7PJYH/AL --> Berkeley Alpha USB --> Jeff Rowland Aeris --> Jeff Rowland 625 S2 --> Focal Utopia 3 Diablos with 2 x Focal Electra SW 1000 BE subs


i7-6700K/Windows 10 Version 1903/HDPLEX 200W/HDPLEX 400W DC-ATX --> EVGA Nu Audio Card --> Focal CMS50's 

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