AN3339 datasheet(11/44 Pages) STMICROELECTRONICS

Part #	AN3339

Description	185 W power supply with PFC and standby supply for LED TV

PDF	44 Pages

Scroll/Zoom	100%

Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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11 / 44 page

AN3339

Efficiency measurement

Doc ID 18449 Rev 2

11/44

Standby supply efficiency

Standby power supply efficiency has been measured and the results are plotted in Figure 3.

As shown, the efficiency during rated load operation is better than 82 %, at both nominal

mains voltages from 50 % to full load.

Figure 4 shows consumption at very light load, such as microprocessor and wake-up

circuitry. This measurement is representative of the significant low consumption from the

mains required for microprocessor powering. It should be mentioned that the standby supply

efficiency has been calculated measuring the input power at the input connector, including

power loss contribution due to all residual loads connected to mains before and after the

input bridge rectifier, such as the EMI filter and PFC dividers.

Figure 3.

Standby power supply efficiency

Figure 4.

Standby consumption

AN3339 Datasheet(PDF) 11 Page - STMicroelectronics