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AN2808 Datasheet(PDF) 35 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) 35 Page - STMicroelectronics

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AN2808
PM6670S evaluation tests
35/40
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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