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AN2808 Arkusz danych(PDF) 35 Page - STMicroelectronics

Numer części AN2808
Szczegółowy opis  The PM6670S device is a complete
PDF  40 Pages
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Producent  STMICROELECTRONICS [STMicroelectronics]
Strona internetowa  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN2808 Arkusz danych(HTML) 35 Page - STMicroelectronics

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AN2808
PM6670S evaluation tests
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Figure 42.
VTT load regulation (h)
Figure 43.
VTTREF load regulation (h)
The efficiency of the switching section is still very high, as shown by the following graphs in
which the VDDQ efficiency is computed against the load, with 12 and 5 V input voltages.
All of the three working modes (forced PWM, pulse skip and non-audible pulse skip) have
been tested.
h.
LDOIN = VDDQ, input voltage 5 V, switching frequency 400 kHz, forced PWM mode.
1.200
1.210
1.220
1.230
1.240
1.250
1.260
1.270
1.280
1.290
-2.0
-1.5
-1.0
-0.5
0.0
0.5
1.0
1.5
2.0
Current [A]
AM00664v1
1.247
1.248
1.249
1.250
1.251
1.252
1.253
1.254
1.255
1.256
1.257
-30-20
-10
0
10
20
30
Current [mA]
AM00665v1



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