VIPER11 datasheet(18/37 Pages) STMICROELECTRONICS

No de pièce	VIPER11

Description	Energy saving offline high voltage converter

PDF	37 Pages

Scroll/Zoom	100%

Fabricant	STMICROELECTRONICS [STMicroelectronics]

Site Internet	http://www.st.com

Logo

18 / 37 page

General description

VIPer11

18/37

DS11873 Rev 5

In external supply the HV current source is always kept off by maintaining the VCC above

VCSon. In this case the residual consumption is given by the power dissipated on RG,

calculated as follows:

Equation 1

At the nominal input voltage, 230 VAC, the typical consumption (RG = 34 M) is 3.2 mW and

the worst-case consumption (RG = 28 M) is 3.9 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 27. Power-ON and power-OFF

VIINDC

------------------

VIPER11 Fiches technique(PDF) 18 Page - STMicroelectronics