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AN2798 Datasheet(PDF) 20 Page - STMicroelectronics

Part # AN2798
Description  Complete DDR2/3 memory power supply
PDF  38 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN2798 Datasheet(HTML) 20 Page - STMicroelectronics

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PM6670AS evaluation tests
AN2798
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8.2.3
VDDQ non-audible pulse-skip mode
In order to avoid an insufficient switching frequency, the non-audible pulse-skip mode can be
selected (JP3 in the upper position and JP1 in the middle). So doing, the minimum switching
frequency allowed is 33 kHz as depicted in the following picture.
8.3
VDDQ, VTT and VTTREF load regulation
Figure 19 through 21 refer to VDDQ, VTT and VTTREF output voltage versus load current.
The switching section works in pulse-skip mode and directly supplies VTT LDO.
Figure 18.
VDDQ = 1.8 V, VIN = 24 V, no load, non-audible pulse-skip mode (33 kHz)
Figure 19.
VDDQ load regulation - VIN = 24 V
1.790
1.800
1.810
1.820
1.830
1.840
0.001
0.010
0.100
1.000
10.000
Current [A]
Forced PWM
Pulse Skip
Non Audible PS
1.790
1.800
1.810
1.820
1.830
1.840
0.001
0.010
0.100
1.000
10.000
Current [A]
Forced PWM
Pulse Skip
Non Audible PS



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