AN2864 datasheet(13/29 Pages) STMICROELECTRONICS

No de pièce	AN2864

Description	VIPER17L demonstration board with wide-range

PDF	29 Pages

Scroll/Zoom	100%

Fabricant	STMICROELECTRONICS [STMicroelectronics]

Site Internet	http://www.st.com

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13 / 29 page

AN2864

Testing the board

Doc ID 15282 Rev 1

13/29

Figure 10.

Output voltage ripple 115 VINAC full load

Figure 11.

Output voltage ripple 230 VINAC full load

When the device works in burst mode, a lower frequency ripple is present. In this mode of

operation the converter does not supply continuous power to its output. It alternates the

period when the power MOSFET is kept off and no power is processed by the converter and

the period when the power MOSFET is switching and power flows towards the converter

output. Even if no load is present at the output of the converter, during no switching periods

the output capacitors are discharged by their leakage currents and the currents required to

supply the part of the feedback loop present at the secondary side. During the switching

CH2 : VOUT

CH2 : VOUT_FLY

CH2 : VOUT

CH2 : VOUT_FLY

AN2864 Fiches technique(PDF) 13 Page - STMicroelectronics