TEA1751LT_1301 datasheet(8/31 Pages) NXP

Nome de Peças	TEA1751LT_1301

Descrição Electrónicos	HV start-up DCM/QR flyback controller with integrated DCM/QR PFC controller

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Fabricante Electrônico	NXP [NXP Semiconductors]

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TEA1751LT

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Product data sheet

Rev. 3. — 9 January 2013

8 of 31

NXP Semiconductors

TEA1751LT

HV start-up flyback controller with integrated PFC controller

7.1.2 Supply management

All internal reference voltages are derived from a temperature compensated and trimmed

on-chip band gap circuit. Internal reference currents are derived from a temperature

compensated and trimmed on-chip current reference circuit.

7.1.3 Latch input

The LATCH pin is a general-purpose input pin, which is used to switch off both converters.

The pin sources a current IO(LATCH) of 80 A. Switching off is stopped as soon as the

voltage on the latch drops below 1.25 V.

At initial start-up, switching is inhibited until the capacitor on the LATCH pin is charged

above 1.35 V. No internal filtering is done on this pin. An internal Zener clamp of 2.9 V

protects this pin from excessive voltages.

Fig 4.

Start-up sequence, normal operation and restart sequence

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TEA1751LT_1301 Folha de dados(PDF) 8 Page - NXP Semiconductors

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