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AN2816 датащи(PDF) 14 Page - STMicroelectronics

номер детали AN2816
подробное описание детали  High-efficiency step-down controller
PDF  36 Pages
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производитель  STMICROELECTRONICS [STMicroelectronics]
домашняя страница  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN2816 датащи(HTML) 14 Page - STMicroelectronics

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Configuration
AN2816
14/36
7
Configuration
The PM6675S demonstration board allows the user to choose the desired mode of
operation using four jumpers (JP1, JP2, JP3 and JP5) and two resistors. Refer to the
following configuration description.
7.1
JP3 fixed or adjustable output voltage (VSEL pin)
The JP3 jumper is used to choose between fixed output voltage (1.5 V) and a user-defined
output voltage in the range 0.6 V to 3.3 V. When connected in the lower position, the fixed
1.5 V output voltage is selected (Figure 9).
If JP3 is in the upper position, the output voltage is given by:
Equation 1
The R8 and R9 resistors are set to 12 k
Ω and 13 kΩ respectively (1.25 V output voltage)
and can be changed by the user.
7.2
JP1 power-saving mode (NOSKIP pin)
The JP1 jumper allows choosing the mode of operation of the switching section. Three
options (forced-PWM, pulse-skip and non-audible pulse-skip) can be selected by changing
the JP1 setting as shown in Figure 10:
Figure 9.
JP3 (VSEL) setting
8
R
9
R
8
R
6
.
0
VOUTADJ
+
⋅
=



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