TEA18361LT

All information provided in this document is subject to legal disclaimers.

© NXP B.V. 2013. All rights reserved.

Product data sheet

Rev. 2 — 12 December 2013

5 of 29

NXP Semiconductors

TEA18361LT

GreenChip SMPS control IC

7.

Functional description

7.1 General control

Figure 3 shows a typical configuration of the TEA18361LT, including flyback circuit

controller.

7.1.1 Start-up and UnderVoltage LockOut (UVLO)

Initially, the capacitor on the VCC pin is charged from the high-voltage mains using the

40

A.

Figure 3) is charged. The system starts switching. In a typical application, the supply

voltage is taken over by the auxiliary winding of the transformer.

the HV charge current until the output voltage is at its regulation level, which is detected

via the CTRL pin. In this way the VCC capacitor value can be limited. Due to the limited

current capability from the HV pin and depending on the mains voltage, the voltage on pin

VCC can still drop slightly during the start-up period.

Fig 3.

Typical TEA18361LT configuration