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AN2808 Datenblatt(PDF) 23 Page - STMicroelectronics

Teilenummer AN2808
Bauteilbeschribung  The PM6670S device is a complete
PDF  40 Pages
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Hersteller  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN2808 Datenblatt(HTML) 23 Page - STMicroelectronics

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AN2808
PM6670S evaluation tests
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Figure 25.
VTT load transient (VIN = 12 V, LOAD = -2 A -> 2 A at 2.5 A/
µs),
pulse-skip mode
10.5
VDDQ efficiency
The three working modes lead to different power efficiencies. The test should be setup so
that VIN = 12 V, FSW = 400 kHz and VDDQ = 1.8 V. The following chart sums up the
results.
Figure 26.
VDDQ efficiency vs. load(a)
a.
Forced PWM (yellow), no-audible pulse-skip (green), pulse-skip (blue).
0%
10%
20%
30%
40%
50%
60%
70%
80%
90%
100%
0,001
0,010
0,100
1,000
10,000
Output Current [A]
Forced PWM
No-Audible Pulse Skip
Pulse Skip
AM00656v1



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