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ACT361

High Performance ActivePSR™ Primary Switching Regulator

Active-Semi, Inc 

TYPICAL APPLICATION CONT’D

VFB Sampling Waveforms

ACT361 senses the output voltage information

through the VFB waveforms. Proper VFB waveforms

are required for IC to operate in a stable status. To

avoid mis-sampling, 1.38µs blanking time is added

to blank the ringing period due to the leakage

inductance and the circuit parasitic capacitance.

Figure 2 is the recommended VFB waveform to

guarantee the correct sampling point so that the

output information can be sent back into the IC to

do the appropriate control.

Figure 2:

1.38µs

ACT361

Rev 8, 14-Nov-12

Innovative PowerTM

-8-

www.active-semi.com

Copyright © 2012 Active-Semi, Inc.

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