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TEA1750T Datasheet(PDF) 6 Page - NXP Semiconductors |
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TEA1750T Datasheet(HTML) 6 Page - NXP Semiconductors |
6 / 29 page TEA1750_2 © NXP B.V. 2008. All rights reserved. Product data sheet Rev. 02 — 15 December 2008 6 of 29 NXP Semiconductors TEA1750 GreenChip III SMPS control IC When the PFC is started, there is initially no supply take-over from the auxiliary winding. To make a small VCC capacitor possible, the VCC voltage is regulated to the Vstartup level, as long as the flyback converter has not yet started. Regulation is done by hysteretic control with a limited (high level) charge current. The hysteresis is typically 300 mV. If during start-up the LATCH pin does not reach the Ven(LATCH) level before VCC reaches Vth(UVLO), the LATCH pin output is de-activated and the charge current is switched on again. As soon as the flyback converter is started, the voltage on the FBCTRL pin is monitored. If the output voltage of the flyback converter does not reach its intended regulation level in a predefined time, the voltage on the FBCTRL pin reaches the Vto(FBCTRL) level and an error is assumed. The TEA1750 then initiates a safe restart. When one of the protection functions is activated, both converters stop switching and the VCC voltage drops to Vth(UVLO). A latched protection recharges the VCC capacitor via the HV pin, but does not restart the converters. For a safe-restart protection, the capacitor is recharged via the HV pin and the device restarts (see Figure 1) In the event of an overvoltage protection of the PFC circuit (VI on pin VOSENSE > Vovp(VOSENSE)), only the PFC controller stops switching until the VOSENSE pin voltage drops below Vovp(VOSENSE) again. Also, if a mains undervoltage is detected (VI on pin VINSENSE < Vstop(VINSENSE)), only the PFC controller stops switching until VI on pin VINSENSE > Vstart(VINSENSE) again. When the voltage on pin VCC drops below the undervoltage lock-out level, both controllers stop switching and re-enter the safe restart mode. In the safe restart mode the driver outputs are disabled and the VCC pin voltage is recharged via the HV pin. |
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