ncp1377b ON Semiconductor, ncp1377b Datasheet - Page 13

• Manufacturer Part Number: ncp1377b
• Description: Pwm Current-mode Controller For Free-running Quasi-resonant Operation
• Manufacturer: ON Semiconductor

Figure 29. This plot gathers waveforms captured at three different operating points:
1
2
the second valley.
3
further expand the burst as Pout goes low.
Figure 30. This picture explains how the 200 mA internal offset
st
nd
rd
Upper Plot: Free run, valley switching operation, Pout = 26 W.
Lowest Plot: The skip slices the second valley pattern and will
Middle Plot: Min Toff clamps the switching frequency and selects
Current Sense Pin (200 mV/pin)
current creates the skip cycle level.
Vrsense (200 mV/div)
200 mA x Rskip
NCP1377, NCP1377B
http://onsemi.com
13
Vgate (5 V/div)