Datasheet

TEA1832LTS All information provided in this document is subject to legal disclaimers. © NXP Semiconductors N.V. 2014. All rights reserved.
Product data sheet Rev. 1 — 15 December 2014 6 of 23
NXP Semiconductors
TEA1832LTS
GreenChip SMPS control IC
When the voltage on pin VCC drops below the V
th(UVLO)
level during normal operation, the
controller stops switching. The TEA1832LTS activates the latched protection and enters
power-down mode. This mechanism avoids that during a short circuit a restart occurs
when the supply voltage reaches V
th(UVLO)
before the OPP time-out is reached (see
Section 7.7
).
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
Fig 4. Start-up sequence, normal operation, and latched protection
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