Thick film hybrid integrated techniques provide the HSA28 Series of military grade DC DC converters with reliability levels and optimum miniaturization. The design and manufacturing process of HSA28 Series of converters are in compliance with General Standards of Hybrid Integrated Circuits （MIL-883 DC/DC converters）and detailed standards of manufacturing.

The HVHF28 series products are designed using forward PWM principle and are new generation 20W series high-reliability military grade DC/DC converter developed through improvement. After being isolated and coupled through optocoupler isolation, the sampling signal of output voltage of the product and the sampling signal of current in input circuit modulate the pulse width of controller at the same time