EPC's EPC9065 is a high-efficiency, zero voltage switching (ZVS), differential mode, class-D amplifier development board that operates at, but is not limited to, 6.78 MHz (lowest ISM band). The purpose of this development board is to simplify the evaluation process of a high-power, ZVS, class-D amplifier for use in applications, such as A4WP wireless power using enhancement-mode gallium nitride FETs (eGaN® FETs), by including all the critical components on a single board that can be easily connected into an existing system. To support the increased power capability, two mounted heat sinks are included.

The amplifier board features the EPC2007C and the EPC8010, which are 100 V rated eGaN FETs. The EPC2007C is used in the class-D amplifier while the EPC8010 is used as a synchronous bootstrap FET. The amplifier can be set to operate in either differential mode or single-ended mode and includes the gate drivers and 6.78 MHz oscillator.

The EPC9065 consists of a differential mode, ZVS, class-D amplifier, a 6.78 MHz oscillator, and a separate heat sink for each class-D section. For operating frequencies other than 6.78 MHz, the oscillator can be disabled by placing a jumper into J60 or can be externally shutdown using an externally controlled open collector/drain transistor on the terminals of J60 (note which is the ground connection). The oscillator disable switch needs to be capable of sinking at least 25 mA. The external oscillator can then be connected to J71.