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AN2833 Datasheet(PDF) 22 Page - STMicroelectronics

Part # AN2833
Description  Dual step-down controller with auxiliary voltages for industrial system power
PDF  32 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN2833 Datasheet(HTML) 22 Page - STMicroelectronics

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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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