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EPC9167 Motor Drive Board
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DESCRIPTION
The EPC9167 demonstration board is a 3-phase BLDC motor drive inverter board featuring the EPC2065 eGaN FET 3.6mΩ maximum R
DS(on)
, 80 V
maximum device voltage. The EPC9167 is provided in two congurations. The standard conguration (EPC9167) uses single FET’s for each switch position
and the high current conguration (EPC9167HC) uses two paralleled FET’s per switch position and can deliver up to 42 Apk (30 A
RMS
) maximum output
current. The board can also be congured for multi-phase DC–DC conversion and the EPC2065 supports PWM switching frequencies up to 250 kHz in
motor drive applications and 500 kHz in DC-DC applications. The EPC9167 contains all the necessary critical functions circuits to support a complete
motor drive inverter including gate drivers, regulated auxiliary power rails for housekeeping supplies, voltage, and temperature sense, accurate current
sense, and protection functions. The various functional blocks are shown in gure 1. The EPC9167 mates with an assortment of compatible controllers,
supported by various manufacturers leveraging existing resources for quick development purposes, that can quickly be congured as a motor drive
inverter or DC–DC converter.
Figure 1: Photo overview of the EPC9167 board highlighting the main sections
Figure 2. Block diagram of EPC9167HC board in BLDC drive example application.
EPC9167HC has two EPC2065 in parallel per each switch, while EPC9167 has only one transistor per switch.
Heatsink mounting (x4)
EPC9167HC EPC9167
Motor
connection
Housekeeping
power supply
Overcurrent
protection
jumper
Control
connection
Current sensing
option setting
Main power
connection
EPC2065
and leg shunts
Hall/encoder
interface
Phase
shunts
Gate drivers
Thermal sensor
Bottom side
Top side
EPC9167
Half
bridge
gate
driver
Jsns1
3V3
5 V
Va
V
IN
Vb
Vc
Ia
Ib
Ic
OCPn
Inverter Board
BLDC
motor
To/From
controller
interface
board
GND
Voltage
sense
Current sense
ampliers
V
IN
up
to 60 V
V
IN
Va
Half
bridge
gate
driver
Jsns2
Vb
Half
bridge
gate
driver
Over
Current
Protection
JOCPn
Vc
HV PSU
Jsns3
A functional block diagram of the EPC9167 demonstration board is shown in gure 2 that details the phase current sense, phase and DC voltage sense,
the half-bridge power stages, housekeeping power supply and controller interface connection.