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AN2808 Datasheet(PDF) 19 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) 19 Page - STMicroelectronics

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AN2808
PM6670S evaluation tests
19/40
Figure 17.
VTT turn-on (S0), pulse-skip mode
10.2
VDDQ working mode
10.2.1
VDDQ forced pulse width mode
When the forced PWM working mode is selected (JP3 and JP1 in the upper position) the
inductor current is allowed to become negative and the following waveform can be captured.
Figure 18.
VDDQ = 1.8 V, VIN = 12 V, IVDDQ = 0 A, forced PWM mode
10.2.2
VDDQ pulse-skip mode
The default working mode is the pulse-skip mode, in which the low-side MOSFET is turned
off when the inductor current becomes equal to zero. This configuration guarantees
maximum efficiency.



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