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NCP1200_06 Datasheet, PDF (1/16 Pages) ON Semiconductor – PWM Current−Mode Controller for Low−Power Universal Off−Line Supplies | |||
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NCP1200
PWM CurrentâMode
Controller for LowâPower
Universal OffâLine Supplies
Housed in SOICâ8 or PDIPâ8 package, the NCP1200 represents a
major leap toward ultraâcompact Switchmode Power Supplies. Due to
a novel concept, the circuit allows the implementation of a complete
offline battery charger or a standby SMPS with few external
components. Furthermore, an integrated output shortâcircuit
protection lets the designer build an extremely lowâcost ACâDC wall
adapter associated with a simplified feedback scheme.
With an internal structure operating at a fixed 40 kHz, 60 kHz or
100 kHz, the controller drives low gateâcharge switching devices like
an IGBT or a MOSFET thus requiring a very small operating power.
Due to currentâmode control, the NCP1200 drastically simplifies the
design of reliable and cheap offline converters with extremely low
acoustic generation and inherent pulseâbyâpulse control.
When the current setpoint falls below a given value, e.g. the output
power demand diminishes, the IC automatically enters the skip cycle
mode and provides excellent efficiency at light loads. Because this
occurs at low peak current, no acoustic noise takes place.
Finally, the IC is selfâsupplied from the DC rail, eliminating the
need of an auxiliary winding. This feature ensures operation in
presence of low output voltage or shorts.
Features
⢠No Auxiliary Winding Operation
⢠Internal Output ShortâCircuit Protection
⢠Extremely Low NoâLoad Standby Power
⢠CurrentâMode with SkipâCycle Capability
⢠Internal Leading Edge Blanking
⢠250 mA Peak Current Source/Sink Capability
⢠Internally Fixed Frequency at 40 kHz, 60 kHz and 100 kHz
⢠Direct Optocoupler Connection
⢠Builtâin Frequency Jittering for Lower EMI
⢠SPICE Models Available for TRANsient and AC Analysis
⢠Internal Temperature Shutdown
⢠PbâFree Packages are Available
Typical Applications
⢠ACâDC Adapters
⢠Offline Battery Chargers
⢠Auxiliary/Ancillary Power Supplies (USB, Appliances, TVs, etc.)
http://onsemi.com
8
1
8
1
SOICâ8
D SUFFIX
CASE 751
MARKING
DIAGRAMS
8
200Dy
ALYW
G
1
PDIPâ8
P SUFFIX
CASE 626
8
1200Pxxx
AWL
YYWWG
1
xxx = Device Code: 40, 60 or 100
y
= Device Code:
4 for 40
6 for 60
1 for 100
A
= Assembly Location
L
= Wafer Lot
Y, YY = Year
W, WW = Work Week
G, G = PbâFree Package
PIN CONNECTIONS
Adj 1
FB 2
CS 3
GND 4
8 HV
7 NC
6 VCC
5 Drv
(Top View)
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 14 of this data sheet.
© Semiconductor Components Industries, LLC, 2006
1
September, 2006 â Rev. 15
Publication Order Number:
NCP1200/D
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