CPWR-AN26, Rev A, 08-2018
Copyright © 2018 Cree, Inc. All rights reserved.
The information in this document is subject to change without notice.
Cree and Zero Recovery are registered trademarks, and the Cree logo and C3M are trademarks, of Cree, Inc
As shown in Figure 4 and Figure 5, the DSP controller from Texas Instruments Inc.
(P/N: TMS320F28337) is the main component of the control board carrying the control algorithm
of the whole system. The input of the control board is an isolated 7 V, 1 A power supply which is
regulated to +5V using a linear regulator. The 3.3 V and 1.2 V power supplies are further created
from the +5V supply using a precision regulator U22 from Texas Instruments Inc. (P/N: TPS70445).
All output PWM (Pulse Width Modulation) signals are buffered and shifted to +5V level by using
a Fairchild Semiconductor International Inc. level shifter (P/N: MC74HCT50A) and a buffer IC
(U13, U15, and U21) before being fed to their respective gate drivers. The reference for the ADC
(Analog to Digital Converter) of the DSP is generated through a precision reference IC (U18) from
Texas Instruments Inc. (P/N: REF3230AIDBVT). All incoming signals to the DSP such as voltages
and currents are galvanically isolated from the high-power side.
