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TEA1750 Datasheet(PDF) 11 Page - NXP Semiconductors |
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TEA1750 Datasheet(HTML) 11 Page - NXP Semiconductors |
11 / 29 page TEA1750_2 © NXP B.V. 2008. All rights reserved. Product data sheet Rev. 02 — 15 December 2008 11 of 29 NXP Semiconductors TEA1750 GreenChip III SMPS control IC 7.2.7 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. 7.2.8 Mains undervoltage lock-out / 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. If the low mains situation continues, the PFC bus voltage eventually drops. The voltage on the VOSENSE pin then drops below the Vstart(fb) level and the flyback converter is also disabled. The voltage on pin VINSENSE is clamped to a minimum value, (Vstart(VINSENSE) −∆Vpu(VINSENSE)) for a fast restart as soon as the mains input voltage is restored after a mains dropout. 7.2.9 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. 7.2.10 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. As the VOSENSE pin draws a small input current, switching is also inhibited when the pin is left open. Fig 6. Burst mode control Vburst(H) Vburst(L) soft-stop ton control soft-start VVOSENSE envelop of peak current 014aaa019 |
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