參數(shù)資料
型號: L6706
廠商: STMICROELECTRONICS
元件分類: 穩(wěn)壓器
英文描述: SWITCHING REGULATOR, QCC40
封裝: 6 X 6 MM, ROHS COMPLIANT, VFQFPN-40
文件頁數(shù): 26/47頁
文件大?。?/td> 623K
代理商: L6706
Soft-start
L6706
32/47
Doc ID 15698 Rev 2
Figure 14.
SSOSC connection
where TSS is the time spent to reach the programmed voltage VSS and RSSOSC the resistor
connected between SSOSC and SSEND (through a signal diode) in k
Ω.
Figure 15.
Soft-start time (TSS) when using RSSOSC, diode versus SSEND
Use the following relationship to select the maximum LTB switching frequency:
where FLIMIT has to be higher than the FSW switching frequency.
SSOSC
SS_END
RSSOSC
D
Q
RPull-Up(1k)
VPull-Up(1.2V)
to SSEND Logic
Rb(10k)
RFLIMIT
Soft Start time and FLIMIT
selected in indipendent way.
RFLIM_SS
Soft Start time depends
on selected FLIMIT.
R
SSOSC
[]
T
D2 μs
[] 40 10
3
1.24
V
DIODE V
[]
1.24
-----------------------------------------------
=
T
SS μs
[]
200
μs
[]
R
SSOSC
[]
40 10
3
-----------------------------------
1.24
V
DIODE V
[]
-----------------------------------------------
V
SS
V
BOOT
------------------
if V
SS
V
BOOT
>
()
R
SSOSC
[]
40 10
3
-----------------------------------
1.24
V
DIODE V
[]
-----------------------------------------------
1
V
SS
V
BOOT
------------------
+
if V
SS
V
BOOT
<
()
+
=
R
FLIMIT
[]
2.11 10
4
F
LIMIT kHz
[]
---------------------------------
1.24
V
CE
BJT
V
[]
1.24
-----------------------------------------------
=
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