VIPER012XSTR datasheet(18/36 Pages) STMICROELECTRONICS

Il numero della parte	VIPER012XSTR

Spiegazioni elettronici	Energy saving off-line high voltage converter

PDF	36 Pages

Scroll/Zoom	100%

Produttore elettronici	STMICROELECTRONICS [STMicroelectronics]

Homepage	http://www.st.com

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18 / 36 page

General description

VIPer01

18/36

DocID028751 Rev 1

obtained through a transformer auxiliary winding or a connection from the output, the latter

in case of non-isolated topology only. In this case the residual consumption is given by the

power dissipated on RG, calculated as follows:

At the nominal input voltage, 230 VAC, the typical consumption (RG

= 30 MΩ) is 3.5 mW and

the worst-case consumption (RG

= 22 MΩ) is 4.8 mW.

When the IC is disconnected from the mains, or there is a mains interruption, for some time

the converter keeps on working, powered by the energy stored in the input bulk capacitor.

When it is discharged below a critical value, the converter is no longer able to keep the

output voltage regulated. During the power down, when the DRAIN voltage becomes too

low, the HV current source (IHV) remains off and the IC is stopped as soon as the VCC drops

below the UVLO threshold, VCCoff.

Figure 26: Power-ON and power-OFF

VIPER012XSTR Scheda tecnica(PDF) 18 Page - STMicroelectronics