AN2833 datasheet(22/32 Pages) STMICROELECTRONICS

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AN2833 Arkusz danych(PDF) 22 Page - STMicroelectronics

Numer części	AN2833

Szczegółowy opis	Dual step-down controller with auxiliary voltages for industrial system power

PDF	32 Pages

Scroll/Zoom	100%

Producent	STMICROELECTRONICS [STMicroelectronics]

Strona internetowa	http://www.st.com

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22 / 32 page

Test setup and performance summary

AN2833

22/32

11.4

3.3 V and 1.8 V output efficiency vs. load current

Figure 13 and 14 show the efficiency versus load current at 24 V of input voltage, in PWM

mode, skip mode and non-audible skip mode.

Figure 13.

3.3 V SMPS efficiency

Figure 14.

1.8 V SMPS efficiency

11.5

Power consumption analysis

To measure the device consumption in real working conditions, an external power supply of

+5 V is connected to EXT5V.

The two traces in the following figures show the differentiation in the two input currents.

Once the internal linear regulator is turned on, the device consumption increases.

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