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L6713ATR датащи(PDF) 38 Page - STMicroelectronics

номер детали L6713ATR
подробное описание детали  2/3 phase controller with embedded drivers for Intel VR10, VR11 and AMD 6 bit CPUs
PDF  64 Pages
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производитель  STMICROELECTRONICS [STMicroelectronics]
домашняя страница  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L6713ATR датащи(HTML) 38 Page - STMicroelectronics

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13.1
LTB™ gain modification (Optional)
The internal gain can be modified through the SS/LTBG/AMD pin, as shown in the
Figure 13.
The SS/LTBG/AMD pin is also used to set the soft-start time, so the current flowing from
SS/LTBG/AMD pin has to be modified only after the soft-start has been finished.
Using the D diode and R3 resistor (red square in Figure 13), after the soft-start the current
flowing from SS/LTBG/AMD pin versus SGND is zero, so the internal gain is not modified.As
a consequence the LTB™ gain is the default value (LTB™ gain = 2).
To decrease the LTB™ gain it is necessary to use the circuit composed by Q, R1 and R2
(blue square in Figure 13.)
After the soft-start the current flowing from SS/LTBG/AMD pin depends only on R1 resistor,
so reducing the R1 resistor value the LTB™ gain can be reduced. The sum of R1 and R2
resistors have to be selected to have the desiderated soft-start time.
Figure 13.
SS/OSC/LTB connections to modify LTB™ gain when using INTEL mode
SS/LTBG/ AMD
SS_END
R2
R1
R3
D
Q
RPull-Up(1k)
VPull-Up(1.2V)
to SSEND Logic
LTB GAIN=2
LTB GAIN <2
Rb(10k)



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