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AN3203 Datasheet(PDF) 14 Page - STMicroelectronics

Part # AN3203
Description  This application note describes the characteristics and performance
PDF  49 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN3203 Datasheet(HTML) 14 Page - STMicroelectronics

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Asymmetrical half bridge operation
AN3203
14/49
Doc ID 17402 Rev 2
Figure 8.
AHB transitions detail @ 20 % rated load
Ch1: LVG pin voltage (yellow)
Ch3: HVG pin voltage (purple)
Ch4: Primary winding current (green)
The key waveforms at the secondary side are shown in Figure 9. It is interesting to note that,
while the current is swapped between the two SR MOSFETs, the voltage at their drain is
nearly zero. The time required for current swap is directly proportional to the primary
leakage inductance. As mentioned before, the effect of this phenomenon is the duty cycle
losses.



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