AN2852 datasheet(9/35 Pages) STMICROELECTRONICS

Part #	AN2852

Description	This document describes the characteristics and performance of a 90 W wide range input

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Manufacturer	STMICROELECTRONICS [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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