NCP1200A
PWM Current鈭扢ode
Controller for Universal
Off鈭扡ine Supplies Featuring
Low Standby Power
Housed in SOIC鈭? or PDIP鈭? 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 off鈭抣ine
AC鈭扗C 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 high鈭抳oltage rail,
avoiding the need of an auxiliary winding. This feature naturally eases
the designer task in battery charger applications. Finally,
current鈭抦ode control provides an excellent audio鈭抯usceptibility and
inherent pulse鈭抌y鈭抪ulse control.
When the current setpoint falls below a given value, e.g. the output
power demand diminishes, the IC automatically enters the so鈭抍alled
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 auto鈭抮ecovers.
Features
8
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MINIATURE PWM
CONTROLLER FOR HIGH
POWER AC鈭扗C WALL
ADAPTERS AND OFFLINE
BATTERY CHARGERS
MARKING
DIAGRAMS
8
8
1
SOIC鈭?
D SUFFIX
CASE 751
1
8
PDIP鈭?
P SUFFIX
CASE 626
1
1200APxxx
AWL
YYWW
200Ay
ALYW
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Pb鈭扚ree Packages are Available
No Auxiliary Winding Operation
Auto鈭扲ecovery Internal Output Short鈭扖ircuit Protection
Extremely Low No鈭扡oad Standby Power
Current鈭扢ode Control with Skip鈭扖ycle 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
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
(Top View)
8 HV
7 NC
6 V
CC
5 Drv
Typical Applications
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AC鈭扗C Adapters for Portable Devices
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Offline Battery Chargers
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Auxiliary 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, 2004
1
October, 2004鈭?Rev. 5
Publication Order Number:
NCP1200A/D
NCP1200AD100R2G 產(chǎn)品屬性
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