參數(shù)資料
型號: NCP1014APL100R2G
廠商: ON SEMICONDUCTOR
元件分類: 穩(wěn)壓器
英文描述: Self−Supplied Monolithic Switcher for Low Standby−Power Offline SMPS
中文描述: 1 A SWITCHING REGULATOR, 110 kHz SWITCHING FREQ-MAX, PDSO7
封裝: LEAD FREE, GULLWING, PLASTIC, DIP-8/7
文件頁數(shù): 14/24頁
文件大?。?/td> 485K
代理商: NCP1014APL100R2G
NCP1010, NCP1011, NCP1012, NCP1013, NCP1014
http://onsemi.com
14
Soft
Start
The NCP101X features an internal 1.0 ms soft
start
activated during the power on sequence (PON). As soon as
V
CC
reaches VCC
OFF
, the peak current is gradually
increased from nearly zero up to the maximum internal
clamping level (e.g. 350 mA). This situation lasts 1.0 ms
and further to that time period, the peak current limit is
blocked to the maximum until the supply enters regulation.
The soft
start is also activated during the over current burst
(OCP) sequence. Every restart attempt is followed by a
soft
start activation. Generally speaking, the soft
start will
be activated when V
CC
ramps up either from zero (fresh
power
on sequence) or 4.7 V, the latch
off voltage
occurring during OCP. Figure 22 portrays the soft
start
behavior. The time scales are purposely shifted to offer a
better zoom portion.
Figure 22. Soft
Start is activated during a startup sequence or an OCP condition.
0 V (Fresh PON)
or
4.7 V (Overload)
V
CC
8.5 V
Current
Sense
Max Ip
1.0 ms
Non
Latching Shutdown
In some cases, it might be desirable to shut off the part
temporarily and authorize its restart once the default has
disappeared. This option can easily be accomplished
through a single NPN bipolar transistor wired between FB
and ground. By pulling FB below the internal skip level
(Vskip), the output pulses are disabled. As soon as FB is
relaxed, the IC resumes its operation. Figure 23
depicts the
application example.
Figure 23. A non
latching shutdown where pulses are stopped as long as the NPN is biased.
ON/OFF
2
7
3
4
5
1
8
Drain
+CV
cc
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