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MUR160RL-NCP1216P100
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AND8038
Implementing the
NCP1200 in a 10 W AC/DC
Wall Adapter
Prepared by: Christophe Basso
ON Semiconductor
INTRODUCTIONThe NCP1200 implements a standard current mode
architecture where the switch–off time is dictated by the
peak primary current setpoint. By combining fixed
frequency and skip cycle operation in a single integrated
circuit, ON Semiconductor NCP1200 represents an
excellent solution where cost and ease of implementation
are premium: low–cost AC/DC adapters, auxiliary
supplies, etc. Furthermore, the device does not require any
auxiliary winding to operate and thus offers a real
breakthrough alternative to UC384X based supplies. This
application note details how to build an efficient and
rugged 10 W adapter. This adapter is designed to operate
from a universal mains (90–260 VAC) while providing a
good standby power at no load.
The Electrical SchematicDriving an external MOSFET,
requires a sense element and a Vcc capacitor. Working
together with an internal high–voltage current source, this
Vcc capacitor provides the NCP1200 with an average DC
level of 11 V typically while it also controls the short–circuit
time out. All these parameters are detailed in the application
note AND8023 available to download at www..
The electrical schematic appears in Figure 1:
Universal Input
1 nF
1 Meg
2 x 27 mH CM
Schaffner
RN1140–08/2
Figure 1. A 10 W AC/DC adapter built with the NCP1200
