NCP1200
PWM Current-Mode
Controller for Low-Power
Universal Off-Line Supplies
Housed in SO鈥? or DIP鈥? package, the NCP1200 represents a
major leap toward ultra鈥揷ompact Switch鈥揗ode Power Supplies.
Thanks 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 short鈥揷ircuit
protection lets the designer build an extremely low鈥揷ost AC/DC 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 gate鈥揷harge switching devices like an
IGBT or a MOSFET thus requiring a very small operating power.
Thanks to current鈥搈ode control, the NCP1200 drastically simplifies
the design of reliable and cheap offline converters with extremely low
acoustic generation and inherent pulse鈥揵y鈥損ulse 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 self鈥搒upplied from the DC rail, eliminating the
need of an auxiliary winding. This feature ensures operation in
presence of low output voltage or shorts.
Features
http://onsemi.com
MARKING
DIAGRAMS
8
SO鈥?
D SUFFIX
CASE 751
1
8
DIP鈥?
P SUFFIX
CASE 626
8
1
xxx
y
1
= Device Code: 40, 60 or 100
= Device Code:
4 for 40
6 for 60
1 for 100
A
= Assembly Location
L
= Wafer Lot
Y, YY = Year
W, WW = Work Week
1200Pxxx
AWL
YYWW
1
200Dy
ALYW
8
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No Auxiliary Winding Operation
Internal Output Short鈥揅ircuit Protection
Extremely Low No鈥揕oad Standby Power
Current鈥揗ode with Skip鈥揅ycle Capability
Internal Leading Edge Blanking
110 mA Peak Current Source/Sink Capability
Internally Fixed Frequency at 40 kHz, 60 kHz and 100 kHz
Direct Optocoupler Connection
Built鈥搃n Frequency Jittering for Lower EMI
SPICE Models Available for TRANsient and AC Analysis
Internal Temperature Shutdown
PIN CONNECTIONS
Adj
FB
CS
Gnd
1
2
3
4
8
7
6
5
HV
NC
V
CC
Drv
Typical Applications
(Top View)
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AC/DC Adapters
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Offline Battery Chargers
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Auxiliary/Ancillary Power Supplies (USB, Appliances, TVs, etc.)
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 13 of this data sheet.
漏
Semiconductor Components Industries, LLC, 2001
1
May, 2001 鈥?Rev. 6
Publication Order Number:
NCP1200/D
NCP1200/D相關(guān)型號PDF文件下載
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描述
廠商
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