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TEA1751LT Datasheet(PDF) 11 Page - NXP Semiconductors |
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TEA1751LT Datasheet(HTML) 11 Page - NXP Semiconductors |
11 / 29 page TEA1751T_LT_2 © NXP B.V. 2009. All rights reserved. Product data sheet Rev. 02 — 23 December 2009 11 of 29 NXP Semiconductors TEA1751T; TEA1751LT GreenChip III SMPS control IC 7.2.8 Overcurrent protection (PFCSENSE pin) The maximum peak current is limited cycle-by-cycle by sensing the voltage across an external sense resistor, RSENSE1, on the source of the external MOSFET. The voltage is measured via the PFCSENSE pin. 7.2.9 Mains undervoltage lockout / brownout protection (VINSENSE pin) To prevent the PFC from operating at very low mains input voltages, the voltage on the VINSENSE pin is sensed continuously. As soon as the voltage on this pin drops below the Vstop(VINSENSE) level, switching of the PFC is stopped. The voltage on pin VINSENSE is clamped to a minimum value, Vstart(VINSENSE) +ΔVpu(VINSENSE), for a fast restart as soon as the mains input voltage is restored after a mains dropout. 7.2.10 Overvoltage protection (VOSENSE pin) To prevent output overvoltage during load steps and mains transients, an overvoltage protection circuit is built in. As soon as the voltage on the VOSENSE pin exceeds the Vovp(VOSENSE) level, switching of the power factor correction circuit is inhibited. Switching of the PFC recommences as soon as the VOSENSE pin voltage drops below the Vovp(VOSENSE) level again. When the resistor between pin VOSENSE and ground is open, the overvoltage protection is also triggered. 7.2.11 PFC open loop protection (VOSENSE pin) The power factor correction circuit does not start switching until the voltage on the VOSENSE pin is above the Vth(ol)(VOSENSE) level. This protects the circuit from open loop and VOSENSE short situations. 7.2.12 Driver (pin PFCDRIVER) The driver circuit to the gate of the power MOSFET has a current sourcing capability of typically −500 mA and a current sink capability of typically 1.2 A. This permits fast turn-on and turn-off of the power MOSFET for efficient operation. Fig 6. Voltage to current transfer function for dual boost PFC VVINSENSE II(VOSENSE) 014aaa097 −15 μA 2.2 V |
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