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TEA18362LT Scheda tecnica(PDF) 8 Page - NXP Semiconductors |
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TEA18362LT Scheda tecnica(HTML) 8 Page - NXP Semiconductors |
8 / 29 page TEA18362LT 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 8 of 29 NXP Semiconductors TEA18362LT GreenChip SMPS control IC 7.4 Mains voltage measuring In a typical application, the mains input voltage is measured using the HV pin. Once per ms the mains voltage is measured by pulling down the HV pin to ground and measuring its current. This current then reflects the input voltage. The system determines if the mains voltage exceeds the brownin level or it is disconnected using an analog-to-digital converter and digital control (see Figure 1). Once the mains is above the brownin level, the system is allowed to start switching (see Figure 6). If the mains voltage is continuously below the brownout level for a period of at least 30 ms, a brownout is detected and the system immediately stops switching. This period is required to avoid that the system stops switching due to the zero crossings of the mains or during a short mains interruption. When the mains voltage is measured by pulling the HV pin to ground, the digital control calculates if there is a positive dV/dt at the mains. A positive dV/dt implies that a mains is connected. Once a mains is detected, the measuring of the mains input voltage is stopped for a period of 6 ms to improve efficiency. In burst mode this waiting period is enlarged to 97 ms to improve efficiency. A positive dV/dt is measured when succeeding samples cross the brownin level (Ibi(HV)) or the mains high level (IIH(HV); see Figure 7). Fig 6. Mains voltage measuring Fig 7. Detecting mains connection by +dV/dt |
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