AN2852 datasheet(8/35 Pages) STMICROELECTRONICS

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AN2852 Datasheet(PDF) 8 Page - STMicroelectronics

Part #	AN2852

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

Download	35 Pages

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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8 / 35 page

Operating waveforms

AN2852

8/35

the positive variation at LVG turn-off. This was done by a correct design of the magnetizing

current, output inductor current ripple and choice of turns ratio.

Figure 4.

Detailed AHB zero-voltage switching at full load

The ZVS condition is harder to meet as the load increases, so full load is the worst condition

to have for a correct ZVS operation. In Figure 5 the same waveforms are shown with half

load. Since the output current is reduced, the fast primary side current variations are also

reduced and so the magnetizing current (that remains basically the same if the load

changes) becomes proportionally higher. The result is that there is more current available

for moving the half-bridge node.

AM01819v1

Ch1: LVG pin voltage (yellow)

Ch3: HVG pin voltage (purple)

Ch4: primary winding current (green)

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