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AN2852 Datasheet(PDF) 9 Page - STMicroelectronics

Part # AN2852
Description  This document describes the characteristics and performance of a 90 W wide range input
PDF  35 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN2852 Datasheet(HTML) 9 Page - STMicroelectronics

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AN2852
Operating waveforms
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Figure 5.
Detailed AHB zero-voltage switching at half load
The key waveforms at the secondary side are shown in Figure 6. It is interesting to note that,
while the current is swapped between the two diodes, the voltage at their cathode is nearly
zero.
Figure 6.
AHB secondary side key waveforms at full load
AM01820v1
Ch1: LVG pin voltage (yellow)
Ch3: HVG pin voltage (purple)
Ch4: primary winding current (green)
AM01821v1
Ch1: D12 and D13 common cathode voltage (yellow)
Ch3: FGND pin voltage (purple)
Ch4: diode D13 current (green)
Ch2: diode D12 current (blue)



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