Power integrations InnoSwitch3 Application Note page 15

AN-72
Step 8 ‒ Tolerance Analysis
This is a useful part of the InnoSwitch3 PIXls designer spreadsheet
that provides the user with switching parameters such as switching
frequency (FSWITCHING) for corner limits of device current limit
CORNER_ILIMIT and primary inductance of transformer
CORNER_LPRIMARY.
182 TOLERANCE ANALYSIS
183 CORNER_VAC
184 CORNER_ILIMIT
185 CORNER_LPRIMARY
186 MODE_OPERATION
187 KP
188 FSWITCHING
189 DUTYCYCLE
190 TIME_ON
191 TIME_OFF
192 IPEAK_PRIMARY
193 IPEDESTAL_PRIMARY
194 IAVERAGE_PRIMARY
195 IRIPPLE_PRIMARY
196 IRMS_PRIMARY
197 CMA_PRIMARY
198 BPEAK
199 BMAX
Figure 12. Tolerance Analysis Section of InnoSwitch3 PIXls Spreadsheet.
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TYP
TYP
85 V Input AC RMS voltage corner to be evaluated
0.95 A Current limit corner to be evaluated
830.5 uH Primary inductance corner to be evaluated
CCM Mode of operation
Measure of continuous/discontinuous mode of
0.728 operation
Switching frequency at full load and valley of the
67267 Hz rectified minimum AC input voltage
0.433 Steady state duty cycle
6.44 us Primary MOSFET on-time
8.43 us Primary MOSFET off-time
0.91 A Primary MOSFET peak currrent
0.25 A Primary MOSFET current pedestal
0.25 A Primary MOSFET average current
0.66 A Primary MOSFET ripple current
0.40 A Primary MOSFET RMS current
252 Cmil/A Primary winding wire CMA
2835 Gauss Peak fux density
2641 Gauss Maximum flux density
Application Note
15
Rev. A 10/18