TEA19363LT
GreenChip SMPS primary side control IC with QR/DCM
operation and active x-capacitor discharge
Rev. 1 — 24 October 2016
Product data sheet
1 General description
The TEA19363LT 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 or smart charging controllers (like the TEA190x series) at the
secondary side. The built-in green functions provide high efficiency at all power levels.
The TEA19363LT is compatible with multiple output voltage applications with a wide
output range from 5 V to 20 V in Constant Voltage (CV) mode. When used with a
secondary-side controller IC, like the TEA190x series, it supports Constant Current (CC)
mode down to 3 V output voltage.
To support computing applications that typically have an X-capacitor with a higher value
than 100 nF, the TEA19363LT incorporates an active X-capacitor discharge function.
At high power levels, the flyback converter operates in Quasi-Resonant (QR) mode. At
lower power levels, the controller switches to Frequency Reduction (FR) in Discontinuous
Conduction Mode (DCM) operation. The peak current is limited 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 optocoupler current reduction regulation has been integrated which reduces
the average optocoupler 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 fsw(min) 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 TEA19363LT includes a wide set of protections. OverVoltage Protection (OVP) and
OverTemperature Protection (OTP) are latched protections. All other protections are safe
restart protections. If the output is shorted, the system stops switching and restarts. The
output power is then limited to a lower level.
The TEA19363LT 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 brownin/brownout sensing at
the input).
The TEA19363LT enables low-cost, highly efficient and reliable supplies for power
requirements up to 75 W using a minimum number of external components.
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