參數(shù)資料
型號: L6714
廠商: STMICROELECTRONICS
元件分類: 穩(wěn)壓器
英文描述: SWITCHING CONTROLLER, 170 kHz SWITCHING FREQ-MAX, PQFP64
封裝: 10 X 10 MM, LEAD FREE, TQFP-64
文件頁數(shù): 39/70頁
文件大?。?/td> 694K
代理商: L6714
Soft start
L6714
44/70
Figure 15. Soft-start time for Intel mode.
15.2
AMD mode
Once L6714 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 14); 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 16):
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 0.6V while OVP is always active with the fixed 1.800V threshold (or the
programmed VOVP).
0
1
2
3
4
5
6
7
8
1
10
100
1000
Rssosc [kOhms] vs. SGND
So
ft
St
a
rt
T
im
e
T
s
[m
s
]
Time to Vboot
Time to 1.6000V
dV
OUT
dT
------------------
3.125
F
SW kkHz
[]
=
T
SS
V
SS
3.125
F
SW kHz
[]
--------------------------------------------------
=
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