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TEA1833LTS Scheda tecnica(PDF) 6 Page - NXP Semiconductors |
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TEA1833LTS Scheda tecnica(HTML) 6 Page - NXP Semiconductors |
6 / 24 page TEA1833LTS All information provided in this document is subject to legal disclaimers. © NXP Semiconductors N.V. 2015. All rights reserved. Product data sheet Rev. 1 — 31 August 2015 6 of 24 NXP Semiconductors TEA1833LTS GreenChip SMPS control IC When the voltage on pin VCC drops below the Vth(UVLO) level during normal operation, the controller stops switching. The TEA1833LTS 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 Vth(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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