1.

General description

The TEA18363LT is a controller IC for low-cost Switched Mode Power Supplies (SMPS).

It is intended for flyback topologies. The built-in green functions provide high efficiency at

all power levels.

At high power levels the flyback operates in Quasi-Resonant (QR) mode. At lower power

levels, the controller switches to Frequency Reduction (FR) or Discontinuous Conduction

Mode (DCM) and limits the peak current to approximately 25 % of the maximum peak

current. Valley switching is used in all operating modes.

At low power levels, when the flyback switching frequency drops below 25 kHz, the

flyback converter switches to burst mode. A special burst mode has been integrated

which reduces the opto current to a minimum level, ensuring high efficiency at low power

and excellent no load power performance. As the switching frequency in this mode has a

minimum value of 25 kHz while the burst frequency is below 800 Hz, the frequencies are

outside the audible range. During the non-switching phase of the burst mode, the internal

IC supply current is minimized for further efficiency optimization.

The TEA18363LT includes an accurate OverPower Protection (OPP). The OPP enables

the controller to operate in overpower situations for a limited amount of time. If the output

is shorted, the system switches to low-power mode where the output power is limited to a

lower level.

The TEA18363LT is manufactured in a high-voltage Silicon-On-Insulator (SOI) process.

The SOI process combines the advantages of a low-voltage process (accuracy,

high-speed protection, functions, and control), while maintaining the high-voltage

capabilities (high-voltage start-up, low standby power, and an integrated X-capacitor

discharge function).

The TEA18363LT enables low-cost, highly efficient and reliable supplies for power

requirements up to 75 W to be designed with a minimum number of external components.

All values mentioned in this data sheet are typical values, unless otherwise specified.

TEA18363LT

GreenChip SMPS control IC

Rev. 2 — 12 December 2013

Product data sheet