Test Waveforms with Different Input/Output Configurations
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SLUUBW3B – October 2018 – Revised June 2020
Copyright © 2018–2020, Texas Instruments Incorporated
UCC2351x Evaluation Module User’s Guide
6
Test Waveforms with Different Input/Output Configurations
6.1
Input Side Reverse Bias
The default configuration grounds the input to cathode buffer. The cathode buffer can alternatively be
driven with a function generator to reverse bias the input diode on turn-off. With J2 jumper (shunt)
removed, cathode and anode buffers are driven 180º out-of-phase, which showcases the reverse blocking
capability of the devices.
Figure 4. Input e-Diode /-5 V
(Ch1 is PWM Input, Ch2 is Output)
6.2
Output Split Supply
The output can be configured to provide split supply operation through two unique methods.
Single supply: Remove R9 and install C6 = C7 = 1 µF, R7 = 7.5 kohm, D2 = 5.1 V Zener, and R8 jumper.
Dual supply: Remove R9 and install C12 = 0.1 µF, C13 = 2.2 µF, apply V+ from VCC to VSS, and V- from
VSS to Phase.
These configurations allow output operation from -5 V off, to VCC-5V on which is commonly found in SiC
power stage configurations.
shows operation with the latter method.