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NCP1201
PWM Current-Mode Controller for Universal Off-Line Supplies Featuring Low Standby Power With Fault Protection Modes
NCP1201
PWM Current-Mode
Controller for Universal
Off-Line Supplies Featuring
Low Standby Power with
Fault Protection Modes
Housed in SOIC−8 or PDIP−8 package, the NCP1201 enhances the
previous NCP1200 series by offering a reduced optocoupler current
with additional Brownout Detection Protection (BOK). Similarly, the
circuit allows the implementation of complete off−line AC−DC
adapters, battery chargers or Switchmode Power Supplies (SMPS)
where standby power is a key parameter.
The NCP1201 features efficient protection circuitry. When in the
presence of a fault (e.g. failed optocoupler, overcurrent condition, etc.)
the control permanently disables the output pulses to avoid subsequent
damage to the system. The IC only restarts when the user cycles the
mains power supply.
With the low power internal structure, operating at a fixed 60 or
100 kHz, the controller supplies itself from the high−voltage rail,
avoiding the need of an auxiliary winding. This feature naturally eases
the designer’s task in battery charger applications. Finally,
current−mode control provides an excellent audio−susceptibility and
inherent pulse−by−pulse control.
When the load current falls down to a pre−defined setpoint (VSKIP)
value, e.g. the output power demand diminishes, the IC automatically
enters the skip cycle mode and can provide excellent efficiency under
light load conditions. The skip mode is designed to operate at
relatively lower peak current so that acoustic noise that commonly
takes place will not happen with NCP1201.
Features Pb−Free Packages are Available AC Line Brownout Detect Protection, BOK Function Latchoff Mode Fault Protection No Auxiliary Winding Operation Internal Output Short−Circuit Protection Extremely Low No−Load Standby Power Current−Mode with Skip−Cycle Capability Internal Overtemperature Shutdown Internal Leading Edge Blanking 250 mA Gate Peak Current Driving Capability Internally Fixed Switching Frequency at 60 or 100 kHz Built−in Frequency Jittering for EMI Reduction Direct Optocoupler Connection
Typical Applications AC−DC Adapters
