TEA1936T

The TEA1936T is a member of the GreenChip family of controller ICs for switched mode power supplies. It is intended for flyback topologies to be used either standalone or together with USB PD controllers like TEA1905 at the secondary side. The built-in green functions provide high efficiency at all power levels.

The TEA1936T is compatible with multiple output voltage applications over a wide output range from 5 V to 20 V in Constant Voltage (CV) mode. When used with a USB-PD secondary side controller such as TEA1905, it also supports Constant Current (CC) mode operation down to 3 V.

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 a minimum level. Valley switching is used in all operating modes.

At very low power levels, the controller uses burst mode to regulate the output power. A special opto current reduction regulation has been integrated which reduces the average opto current in all modes to a minimum level. This reduction ensures high efficiency at low power and excellent no-load power performance. As the switching frequency in this mode is never less than 25 kHz and the burst repetition rate is regulated to a low value, the audible noise is minimized. During the non-switching phase of the burst mode, the internal IC supply current is minimized for further efficiency optimization.

The TEA1936T includes an accurate OverPower Protection (OPP). If the output is shorted, the system switches to low-power mode. The output power is then limited to a lower level.

The TEA1936T 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). However, it also maintains the high-voltage capabilities (high-voltage start-up, low standby power, and an integrated X-capacitor discharge function).

The TEA1936T enables low-cost, highly efficient and reliable supplies including multiple output voltage support for power requirements up to 75 W using a minimum number of external components.