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
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
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