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TEA1623PH Scheda tecnica(PDF) 7 Page - NXP Semiconductors |
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TEA1623PH Scheda tecnica(HTML) 7 Page - NXP Semiconductors |
7 / 20 page TEA1623P_TEA1623PH All information provided in this document is subject to legal disclaimers. © NXP B.V. 2010. All rights reserved. Product data sheet Rev. 3 — 30 August 2010 7 of 20 NXP Semiconductors TEA1623P; TEA1623PH STARplug switched mode power supply controller IC 8.5 Demagnetization The system operates in discontinuous conduction mode all the time. As long as the secondary stroke has not ended, the oscillator will not start a new primary stroke. During the suppression time tsuppr, demagnetization recognition is suppressed. This suppression may be necessary in applications where the transformer has a large leakage inductance and at low output voltages. A: Start of new cycle with valley switching. B: Start of new cycle in a classical PWM system. Fig 5. Signals for valley switching Reflected voltage at N × V o =80V. Fig 6. Typical phase of drain ringing at switch-on col007 drain valley secondary ringing secondary stroke primary stroke secondary stroke RC oscillator regulation level A B f (kHz) 0 800 600 200 400 001aaa311 0 −20 20 40 phase ( °) −40 |
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