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AN2808 Datasheet(PDF) 36 Page - STMicroelectronics

Part # AN2808
Description  The PM6670S device is a complete
PDF  40 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN2808 Datasheet(HTML) 36 Page - STMicroelectronics

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PM6670S evaluation tests
AN2808
36/40
Figure 44.
Efficiency vs load – VDDQ = 2.5 V, Vin = 12 V
Figure 45.
Efficiency vs load – VDDQ = 2.5 V, Vin = 5 V
When the input voltage is equal to 5 V the VDDQ rail efficiency is higher than 90%, with a
load greater than 4 mA. This can also be achieved with a very low load when the pulse skip
or non-audible pulse skip working mode is selected. The following two graphs show how the
switching frequency can change with the load: by decreasing the switching frequency the
regulator can greatly increase the efficiency.
0
10
20
30
40
50
60
70
80
90
100
0.001
0.010
0.100
1.000
10.000
Current [A]
Forced PWM
Pulse Skip
NO AUD. PS
AM00666v1
0
10
20
30
40
50
60
70
80
90
100
0.001
0.010
0.100
1.000
10.000
Current [A]
Forced PWM
Pulse Skip
NO AUD. PS
AM00667v1



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