Once again, the company is using three of its 100V 15Arms EPC23104 monolithic half-bridge ICs, which include power transistors, drivers and level-shifting.
Power dissipation is minimised by the 8.7mΩ (typ) on-resistance of the driver ICs.
The board is called EPC91118, and its specification is 15 to 55V, 10Arms and 21Apeak while installed on the back of a motor in a robot wrist.
The 32mm board is delivered in a 55mm frame (see photos) that includes connectors and screw locations to fit directly onto a motor (left) that EPC has yet to name (Electronics Weekly has asked, so watch this space if it is important to you).
Also on the 32mm PCB are RS485 communications, a 5Vout dc-dc converter, a 3.3Vout LDO, and current sensing for two of the three output phases.
The MCU is an STM32G431CBU6 and the magnetic encoder outputs 1,024 pulses over 360°.
Due to the high operational frequency that GaN allows – the PWMs run at 100kHz with 50ns dead-time – electrolytic capacitors have been eliminated from the circuits, said company CEO Alex Lidow. The DC-link only uses ceramic capacitors.
Use in drones is also expected.
EPC’s EPC91118 product page can be found here EPC suggests buying the board from Digi-Key.
