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AN2808 Folha de dados(PDF) 28 Page - STMicroelectronics

Nome de Peças AN2808
Descrição Electrónicos  The PM6670S device is a complete
PDF  40 Pages
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Fabricante Electrônico  STMICROELECTRONICS [STMicroelectronics]
Página de início  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN2808 Folha de dados(HTML) 28 Page - STMicroelectronics

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PM6670S evaluation tests
AN2808
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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
320
340
360
380
400
420
440
460
480
0
5
10
15
20
25
30
Input voltage (V)
AM00659v1



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