參數(shù)資料
型號(hào)： 1203P60
廠商： ON SEMICONDUCTOR
英文描述： PWM Current-Mode Controller for Universal Off-Line Supplies Featuring Standby and Short Circuit
中文描述： PWM電流模式控制器的通用離線Supplies以待機(jī)和短路
文件頁(yè)數(shù)： 7/14頁(yè)
文件大?。?/td> 145K
代理商： 1203P60
NCP1203
http://onsemi.com
7
APPLICATION INFORMATION
Introduction
The NCP1203 implements a standard current mode
architecture where the switchoff time is dictated by the
peak current setpoint. This component represents the ideal
candidate where low partcount is the key parameter,
particularly in lowcost ACDC adapters, auxiliary
supplies etc. Due to its highperformance SMARTMOS
HighVoltage technology, the NCP1203 incorporates all the
necessary components normally needed in UC384X based
supplies: timing components, feedback devices, lowpass
filter and startup device. This later point emphasizes the fact
that ON Semiconductor’s NCP1203 does not need an
external startup resistance but supplies the startup current
directly from the highvoltage rail. On the other hand, more
and more applications are requiring low noload standby
power, e.g. for ACDC adapters, VCRs etc. UC384X series
have a lot of difficulty to reduce the switching losses at low
power levels. NCP1203 elegantly solves this problem by
skipping unwanted switching cycles at a useradjustable
power level. By ensuring that skip cycles take place at low
peak current, the device ensures quiet, noise free operation.
Finally, an autorecovery output shortcircuit protection
(OCP) prevents from any lethal thermal runaway in
overload conditions.
Startup Sequence
When the power supply is first powered from the mains
outlet, the internal current source (typically 6.0 mA) is
biased and charges up the V
CC
capacitor. When the voltage
on this V
CC
capacitor reaches the V
CC(on)
level (typically
12.8 V), the current source turns off and no longer wastes
any power. At this time, the V
CC
capacitor only supplies the
controller and the auxiliary supply is supposed to take over
before V
CC
collapses below V
CC(min)
. Figure 13 shows the
internal arrangement of this structure:
Figure 13. The Current Source Brings V
CC
Above 12.8 V and then Turns Off
+
8
6
4
6 mA or 0
CV
CC
Aux
HV
12.8 V/4.9 V
Once the power supply has started, the V
CC
shall be
constrained below 16 V, which is the maximum rating on
pin 6. Figure 14 portrays a typical startup sequence with a
V
CC
regulated at 12.5 V:
Figure 14. A Typical Startup Sequence for
the NCP1203
t, TIME (sec)
3.00 M
8.00 M
13.0 M
18.0 M
23.0 M
13.5
12.5
11.5
10.5
9.5
REGULATION
12.8 V
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