参数资料
型号: L6706
厂商: STMICROELECTRONICS
元件分类: 稳压器
英文描述: SWITCHING REGULATOR, QCC40
封装: 6 X 6 MM, ROHS COMPLIANT, VFQFPN-40
文件页数: 27/47页
文件大小: 623K
代理商: L6706
L6706
Soft-start
Doc ID 15698 Rev 2
33/47
Note:
Connecting SSOSC pin to SGND through only the RFLIM_SS resistor (blue one network in
Figure 14), the soft-start time depends on the FLIMIT selected.
In this case use the following relationship to select FLIMIT and as a consequence the soft-
start time:
Figure 16.
Soft-start time (TSS) vs FLIMIT when using RFLIM_SS resistor versus SGND
14.1
Low-side-less startup
In order to avoid any kind of negative undershoot on the load side during startup, L6706
performs a special sequence in enabling LS driver to switch: during the soft-start phase, the
LS driver results disabled (LS = OFF) until the HS starts to switch. This avoid the dangerous
negative spike on the output voltage that can happen if starting over a pre-biased output
This particular feature of the device masks the LS turn-on only from the control loop point of
view: protections are still allowed to turn-ON the LS MOSFET in case of over voltage if
needed.
Figure 17.
Low-side-less startup comparison.WITH LS-Less startup
R
FLIM
SS
k
Ω
[]
2.11 10
4
F
LIMIT kHz
[]
---------------------------------
=
T
D2 μs
[]
5.275 10
5
F
LIMIT kHz
[]
---------------------------------
=
VOUT
LGATE
WITHOUT LS-Less startup
WITH LS-Less startup
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