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AN2798 数据表(PDF) 32 Page - STMicroelectronics

部件名 AN2798
功能描述  Complete DDR2/3 memory power supply
PDF  38 Pages
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制造商  STMICROELECTRONICS [STMicroelectronics]
网页  http://www.st.com
标志 STMICROELECTRONICS - STMicroelectronics

AN2798 数据表(HTML) 32 Page - STMicroelectronics

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PM6670AS evaluation tests
AN2798
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Switching frequency vs. output current
The switching frequency can decrease to very low values in pulse-skip mode instead in non-
audible pulse-skip there is a lower limit (about 33 kHz). With increasing load, however, the
switching frequency increases a bit, as a consequence of conduction and switching losses.
Figure 35.
Forced PWM (blue), non-audible pulse-skip (green) and pulse-skip (red), switching
frequency vs. output current, VDDQ = 1.8 V, VIN = 24 V
0
100
200
300
400
500
0.001
0.010
0.100
1.000
10.000
Current [A]
Forced PWM
Pulse Skip
Non Audible PS
0
100
200
300
400
500
0.001
0.010
0.100
1.000
10.000
Current [A]
Forced PWM
Pulse Skip
Non Audible PS



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