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L6713ATR Datasheet(PDF) 45 Page - STMicroelectronics

No. de pieza L6713ATR
Descripción Electrónicos  2/3 phase controller with embedded drivers for Intel VR10, VR11 and AMD 6 bit CPUs
PDF  64 Pages
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Fabricante Electrónico  STMICROELECTRONICS [STMicroelectronics]
Página de inicio  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L6713ATR Datasheet(HTML) 45 Page - STMicroelectronics

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L6713A
Soft-start
45/64
Figure 19.
Soft-start time for Intel mode when using RSSOSC versus SGND
16.2
AMD mode
Once L6713A receives all the correct supplies and enables, and AMD mode has been
selected, it initiates the soft-start by stepping the reference from zero up to the programmed
VID code (See Figure 15); the clock now used to step the reference is the same as the main
oscillator programmed by the OSC pin, SSOSC pin is not applicable in this case. The soft-
start time results then (See Figure 20):
where TSS is the time spent to reach VSS and FSW is the main switching frequency
programmed by OSC pin. Protections are active during soft-start, UVP is enabled after the
reference reaches 0.6 V while OVP is always active with the fixed 1.800 V threshold (or the
programmed VOVP).
Figure 20.
Soft-start time for AMD mode
0
0.5
1
1.5
2
2.5
3
3.5
4
4.5
5
1
10
100
1000
Rssosc [kOhms] vs. SGND
Time to Vboot
Time to 1.6000V
dV
OUT
dT
------------------
3.125 F
SW kkHz
[]
⋅
=
T
SS
V
SS
3.125 F
SW kHz
[]
⋅
-----------------------------------------------
=
⇒
0
0.5
1
1.5
2
2.5
3
3.5
4
0
200
400
600
800
1000
Rosc [kOhms] to SGND
150
200
250
300
350
400
450
500
550
Time to 1.6000V
Time to 1.1000V
Switching Frequency per phase
0
0.5
1
1.5
2
2.5
3
3.5
4
0
200
400
600
800
1000
Rosc [kOhms] to SGND
150
200
250
300
350
400
450
500
550
Time to 1.6000V
Time to 1.1000V
Switching Frequency per phase



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