TEA1832TS

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© NXP Semiconductors N.V. 2014. All rights reserved.

Product data sheet

Rev. 1 — 16 December 2014

6 of 23

NXP Semiconductors

TEA1832TS

GreenChip SMPS control IC

When a latched protection is triggered, the TEA1832TS immediately enters power-down

mode. The VCC pin is clamped to a voltage just above the latch protection reset voltage

controller stops switching. The TEA1832TS waits for the rectified mains to charge the

7.3 Supply management

All internal reference voltages are derived from a temperature compensated on-chip band

gap circuit. Internal reference currents are derived from a trimmed and temperature

compensated current reference circuit.

7.4 External overtemperature protection and mains detect input

(pin PROTECT)

The PROTECT input combines the functions of the mains voltage detection

(browin/brownout) and the external OverTemperature Protection (OTP). An internal clock

separates the period of measuring the mains voltage and the period of detecting external

OverTemperature Protection (OTP). In a typical application, the PROTECT pin is

connected to the mains via a resistor. It is connected to ground via a negative temperature

coefficient (NTC) thermistor and a diode.

When measuring the mains voltage, the PROTECT pin is regulated to 0.25 V to prevent

that the external diode conducts current. The current into the PROTECT pin is measured

and stored. Once the measured current is above the brownin level, the system is allowed

to start switching. If the mains voltage is continuously below the brownout level for at least

32 ms, a brownout is detected. The system immediately stops switching and performs a

Fig 4.

Start-up sequence, normal operation and restart sequence