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ON - PWM Current-Mode Controller for Universal Off-Line Supplies Featuring Low Standby Power

Numéro de référence NCP1200A
Description PWM Current-Mode Controller for Universal Off-Line Supplies Featuring Low Standby Power
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NCP1200A fiche technique
NCP1200A
PWM Current-Mode
Controller for Universal
Off-Line Supplies Featuring
Low Standby Power
Housed in SOIC8 or PDIP8 package, the NCP1200A enhances
the previous NCP1200 series by offering a reduced optocoupler
current together with an increased drive capability. Due to its novel
concept, the circuit allows the implementation of complete offline
ACDC adapters, battery charger or a SMPS where standby power is
a key parameter.
With an internal structure operating at a fixed 40 kHz, 60 kHz or
100 kHz, the controller supplies itself from the highvoltage rail,
avoiding the need of an auxiliary winding. This feature naturally eases
the designer task in battery charger applications. Finally,
currentmode control provides an excellent audiosusceptibility and
inherent pulsebypulse control.
When the current setpoint falls below a given value, e.g. the output
power demand diminishes, the IC automatically enters the socalled
skip cycle mode and provides excellent efficiency at light loads.
Because this occurs at a user adjustable low peak current, no acoustic
noise takes place.
The NCP1200A features an efficient protective circuitry which, in
presence of an overcurrent condition, disables the output pulses while
the device enters a safe burst mode, trying to restart. Once the default
has gone, the device autorecovers.
Features
No Auxiliary Winding Operation
AutoRecovery Internal Output ShortCircuit Protection
Extremely Low NoLoad Standby Power
CurrentMode Control with SkipCycle Capability
Internal Temperature Shutdown
Internal Leading Edge Blanking
250 mA Peak Current Capability
Internally Fixed Frequency at 40 kHz, 60 kHz and 100 kHz
Direct Optocoupler Connection
SPICE Models Available for TRANsient and AC Analysis
Pin to Pin Compatible with NCP1200
PbFree Packages are Available
Typical Applications
ACDC Adapters for Portable Devices
Offline Battery Chargers
Auxiliary Power Supplies (USB, Appliances, TVs, etc.)
http://onsemi.com
MINIATURE PWM
CONTROLLER FOR HIGH
POWER ACDC WALL
ADAPTERS AND OFFLINE
BATTERY CHARGERS
8
1
8
1
SOIC8
D SUFFIX
CASE 751
MARKING
DIAGRAMS
8
200Ax
ALYW
G
1
PDIP8
P SUFFIX
CASE 626
8
1200APyy
AWL
YYWWG
1
x = 1, 4, or 6
yy = 40, 60, or 100
A = Assembly Location
L, WL = Wafer Lot
Y, YY = Year
W, WW = Work Week
G or G = PbFree 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, 2011
January, 2011 Rev. 9
1
Publication Order Number:
NCP1200A/D

PagesPages 16
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