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MIC33M656 Evaluation Board User’s Guide
DS50002914A-page 14
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2019 Microchip Technology Inc.
FIGURE 2-2: MIC33M656 Evaluation Board Test Setup.
2.3.1.3 PERFORMANCE EVALUATION
The oscilloscope screen capture in Figure 2-3 displays the MIC33M656 switching
waveforms during normal operation, when supplied from a 5V input at full load (6A).
FIGURE 2-3: Normal Operation at 1V Output, 6A Load.
2.3.1.4 LOOP GAIN MEASUREMENT
The MIC33M656 Evaluation Board provides injection points and a termination resistor
(R12) for AC loop gain measurements. If needed, the value of R12 can be changed to
optimize the injection signal level. Inject the oscillator at J9 through the insulation
transformer (i.e., across resistor R12) and connect the A (CH1) and B (CH2) channels
to J9 Pin 1 and J9 Pin 2, respectively, or as indicated by the operating instructions of
the particular loop gain analyzer in use.
Oscilloscope
CH1 CH2
Power –
I
2
C Monitor
(PC)
Ammeter (10A)
Voltmeter
Load
V
IN
5V/div
V
OUT
50 mV/div
AC Coupled
SW
5V/div
Io
5A/div