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AN2808 Datasheet(PDF) 28 Page - STMicroelectronics

No. de pieza AN2808
Descripción Electrónicos  The PM6670S device is a complete
PDF  40 Pages
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Fabricante Electrónico  STMICROELECTRONICS [STMicroelectronics]
Página de inicio  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN2808 Datasheet(HTML) 28 Page - STMicroelectronics

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PM6670S evaluation tests
AN2808
28/40
Figure 33.
VTT current limit during an output short
10.10
Switching frequency
10.10.1
Switching frequency vs input voltage
The constant on-time controller leads to a quasi-constant switching frequency, that more or
less follows the input voltage.
Figure 34.
fsw vs input voltage, DDR2(b)
b.
Forced PWM (blue), no-audible pulse-skip (purple) and pulse-skip (yellow). Switching frequency vs input
voltage, VDDQ = 1.8 V, IVDDQ = 7 A.
300
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0
5
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30
Input voltage (V)
AM00659v1



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