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NCP1200A Datasheet, PDF (1/16 Pages) ON Semiconductor – PWM Current-Mode Controller for Universal Off-Line Supplies Featuring Low Standby Power | |||
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NCP1200A
PWM CurrentâMode
Controller for Universal
OffâLine Supplies Featuring
Low Standby Power
Housed in SOICâ8 or PDIPâ8 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 offâline
ACâDC 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 highâvoltage rail,
avoiding the need of an auxiliary winding. This feature naturally eases
the designer task in battery charger applications. Finally,
currentâmode control provides an excellent audioâsusceptibility 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 soâcalled
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 autoârecovers.
Features
⢠PbâFree Packages are Available
⢠No Auxiliary Winding Operation
⢠AutoâRecovery Internal Output ShortâCircuit Protection
⢠Extremely Low NoâLoad Standby Power
⢠CurrentâMode Control with SkipâCycle 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
Typical Applications
⢠ACâDC Adapters for Portable Devices
⢠Offline Battery Chargers
⢠Auxiliary Power Supplies (USB, Appliances, TVs, etc.)
http://onsemi.com
MINIATURE PWM
CONTROLLER FOR HIGH
POWER ACâDC WALL
ADAPTERS AND OFFLINE
BATTERY CHARGERS
8
1
8
1
SOICâ8
D SUFFIX
CASE 751
MARKING
DIAGRAMS
8
200Ay
ALYW
1
PDIPâ8
P SUFFIX
CASE 626
8
1200APxxx
AWL
YYWW
1
xxx = Specific Device Code
(40, 60 or 100)
y
= Specific Device Code
(4 for 40, 6 for 60, 1 for 100)
A
= Assembly Location
WL, L = Wafer Lot
Y, YY = Year
W, WW = Work Week
PIN CONNECTIONS
Adj 1
FB 2
CS 3
GND 4
8 HV
7 NC
6 VCC
5 Drv
(Top View)
© Semiconductor Components Industries, LLC, 2004
October, 2004â Rev. 5
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 13 of this data sheet.
1
Publication Order Number:
NCP1200A/D
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