TEA18363T

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Product data sheet

Rev. 2 — 12 December 2013

11 of 27

NXP Semiconductors

TEA18363T

GreenChip SMPS control IC

During system start-up, the maximum overpower is limited to 100 % and the maximum

time-out period is lowered to 40 ms. Once the output voltage is within its regulation level

(voltage on the CTRL pin is below 5 V), the maximum overpower is switched to 150 %

and the maximum time-out period returns to 200 ms limiting the output power to a

minimum at a shorted output. Lowering the maximum output power and shortening the

overpower timer ensure that the input power of the system is limited to < 5 W at a shorted

output.

Due to the limited output power, the output voltage drops if the load requires more than

the same response in an overpower situation (whether UVLO is triggered or not) the

system enters the protection mode (latch or safe restart) when overpower + UVLO is

detected. The system entering the protection mode does not depend on the value of the

OP counter.

7.6.2 OverVoltage Protection (OVP)

An accurate output OVP is implemented by measuring the voltage at the AUX pin during

the secondary stroke. As the auxiliary winding voltage is a well-defined replica of the

output voltage, the OVP level can be adjusted by the external resistor divider ratio

An internal counter of four gate pulses prevents false OVP detection which can occur

during ESD or lightning events.

7.6.3 OverTemperature Protection (OTP)

Integrated OTP ensures that the IC stops switching if the junction temperature exceeds

the thermal temperature shutdown limit. OTP is a latched protection.

7.6.4 Maximum on-time

The controller limits the on-time of the external MOSFET to 55

s. When the on-time is

longer, the IC stops switching and enters safe restart mode.

Fig 9.

Overpower protection curves