參數(shù)資料
型號: L6713ATR
廠商: STMICROELECTRONICS
元件分類: 穩(wěn)壓器
英文描述: 2 A SWITCHING CONTROLLER, 225 kHz SWITCHING FREQ-MAX, PQFP64
封裝: 10 X 10 MM, TQFP-64
文件頁數(shù): 39/64頁
文件大?。?/td> 801K
代理商: L6713ATR
Soft-start
L6713A
44/64
Figure 17.
Soft-start time for Intel mode when using RSSOSC, diode versus SSEND
16.1.2
SS/LTB/AMD connections when using LTB gain < 2
When using LTB gain <2, the equivalent RSSOSC resistance is composed by the sum of
R1+R2) because until the soft-start is not finished the Q transistor is OFF (See Figure 18).
Figure 18.
SS/LTBG/AMD connections for INTEL mode, when using LTB gain < 2
where TSS is the time spent to reach the programmed voltage VSS and RSSOSC the resistor
connected between SS/LTBG/AMD and SGND (RSSOSC = R1 + R2) in kΩ.
0
1
2
3
4
5
6
7
1
10
100
1000
Rssosc [kOhms] vs. SSEND through sognal diode
S
o
ft
St
ar
tT
im
eT
ss
[m
s]
Time to Vboot
Time to 1.6000V
SS/LTBG/ AMD
SS_END
R2
R1
Q
RPull-Up(1k)
VPull-Up(1.2V)
to SSEND Logic
Rb(10k)
RSSOSC=R1+R2
R
SSOSC
[]
T
2 μs
[] 4.9783 10
2
=
T
SS μs
[]
1075
μs
[]
R
SSOSC
[]
5.3816 10
2
----------------------------------- V
SS
if V
SS
V
BOOT
>
()
R
SSOSC
[]
5.3816 10
2
-----------------------------------
V
BOOT
V
BOOT
V
SS
()
+
[]
if V
SS
V
BOOT
<
()
+
=
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