TEA1723BT
HV start-up flyback controller with integrated MOSFET for
11 W applications, 905 Hz burst frequency

 

 

1.   Product profile

1.1   General description

The TEA1723 is a small and low cost module Switched Mode Power Supply (SMPS)
controller IC for power applications (up to 11 W) and operates directly from the rectified
universal mains input. The device includes a high voltage power switch (700 V) and has
been optimized for flyback converter topologies to provide high-efficiency over the entire
load range with ultra-low power consumption in the no-load condition. It provides a circuit
for start-up directly from the rectified mains voltage without any external bleeder circuits.
The converter operates as a regulated voltage source from no-load up to the maximum
output current and operates as current source that delivers the maximum current over a
broad output voltage range. Using the TEA1723, a low power converter can be built at
minimum cost and with the minimum number of external components.
The controller regulates the output voltage with primary-side sensing which eliminates the
need for an additional secondary feedback circuitry and simplifies the design. At higher
power levels, a frequency and current control mode is used. It operates with Burst mode
control at low power levels and no-load condition. The burst mode minimizes audible
noise and provides an energy saver state which reduces the power consumption in
no-load condition. The Burst mode frequency of 905 Hz enables no-load power
consumption < 25 mW at 230 V (AC) mains input.

 

1.2   Features and benefits

Power features:
  Low power SMPS controller with integrated power switch designed for applications up to 11 W
  700 V high voltage power switch for global mains operation
  Primary sensing for control of the output voltage without optocoupler and secondary feedback circuitry
  Minimizes audible noise in all operation modes
  Energy Star 2.0 compliant
  Jitter function for reduced EMINXP Semiconductors  TEA1723BT
      HV start-up flyback controller with integrated MOSFET for 11 W

Green features:
  Enables no-load power consumption < 25 mW
  Very low supply current in no-load condition with energy saver mode
  Incorporates a high voltage start-up circuit with zero current consumption under normal switching operation
  Available in halogen-free and Restriction of Hazardous Substances (RoHS) SO7 package

Protective functions:
  OverVoltage Protection (OVP) on Feedback control (FB) pin with auto-restart
  UnderVoltage LockOut (UVLO) protection on IC supply pin
  OverTemperature Protection (OTP)
  Soft-start by reduced peak current for zero and low output voltage
  Demagnetization protection for guaranteed discontinuous conduction mode operation
  Open and short-circuit protection of the Feedback control (FB) pin
  Short-circuit protection of the charger output

 

1.3   Applications

  Battery chargers for cellular phones, tablet pc and other power adapters up to 11 W
  Standby supply for TV, desktop PC and set-top boxes
  Power supply for white goods applications

Companies Website:
http://www.nxp.com/campaigns/greenchip/1534

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