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TEA18362T Folha de dados(PDF) 5 Page - NXP Semiconductors |
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TEA18362T Folha de dados(HTML) 5 Page - NXP Semiconductors |
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5 / 29 page  TEA18362T All information provided in this document is subject to legal disclaimers. © NXP B.V. 2013. All rights reserved. Product data sheet Rev. 2 — 12 December 2013 5 of 29 NXP Semiconductors TEA18362T GreenChip SMPS control IC 7. Functional description 7.1 General control Figure 3 shows a typical configuration of the TEA18362T, including flyback circuit controller. 7.1.1 Start-up and UnderVoltage LockOut (UVLO) Initially, the capacitor on the VCC pin is charged from the high-voltage mains using the HV pin. As long as VCC is below Vstartup, the IC current consumption is minimized to 40 A. When VCC reaches the Vstartup level, the control logic activates the internal circuitry. The IC then waits for the PROTECT pin to reach Vdet(PROTECT) + Vdet(hys)PROTECT, the CTRL pin to reach Vstartup(CTRL), and the mains voltage to increase to above the brownin level. When all these conditions are met, the soft start capacitor on the ISENSE pin (CSS in Figure 3) is charged. The system starts switching. In a typical application, the supply voltage is taken over by the auxiliary winding of the transformer. During the start-up period, the VCC pin is continuously regulated to the Vstartup level using the HV charge current until the output voltage is at its regulation level, which is detected via the CTRL pin. In this way the VCC capacitor value can be limited. Due to the limited current capability from the HV pin and depending on the mains voltage, the voltage on pin VCC can still drop slightly during the start-up period. Fig 3. Typical TEA18362T configuration |
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