Auxiliary Power Supply Circuit - Infineon EVAL-M1-2ED2106S User Manual

EVAL-M1-2ED2106S User Manual
2ED2106S06F drive board for BLDC motor
Circuit diagram of the EVAL-M1-2ED2106S
7.4

Auxiliary power supply circuit

As Figure 13 shows, the gate drivers' supply +15 V is generated from a flyback circuit with the CoolSET
controller ICE5GR4780AG. The +3.3 V for the external control board is regulated by the Infineon LDO IFX1117-ME
from another winding of the transformer.
Although the auxiliary power supply adopts a flyback transformer and an opto-coupler, the primary and
secondary side on this board are not isolated.
Figure 13 Auxiliary power supply circuit
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power
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Revision 1.0
2019-09-18