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AN2787 Datasheet(PDF) 18 Page - STMicroelectronics

Part # AN2787
Description  Monolithic VR demonstration board for chipset
PDF  37 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN2787 Datasheet(HTML) 18 Page - STMicroelectronics

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Configuration
AN2787
18/37
7.6
JP7 current limit (CSNS pin)
Each switching regulator current limit is set by inserting a resistor between the CSNS pin
and AGND. By changing this resistor value, all the current limits change, as shown in
Figure 14
.
Figure 14.
PM6641 demonstration board programmed current limit vs. CSNS
resistor
If the CSNS pin is tied to AVCC, the current limit is set through the inner reference resistor
(equal to 50 k
Ω).
Figure 15.
JP8 setting switching frequency
Peak Current Limit
0,00
1,00
2,00
3,00
4,00
5,00
6,00
7,00
50
70
90
110
130
150
170
Rcsns [kOhm ]
CL_1V8
CL_1V5
CL_1V05
Adjusted Switching Frequency
Default Switching Frequency



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