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TEA1506AT Scheda tecnica(PDF) 9 Page - NXP Semiconductors |
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TEA1506AT Scheda tecnica(HTML) 9 Page - NXP Semiconductors |
9 / 22 page 2003 Sep 09 9 Philips Semiconductors Product specification GreenChip ™II SMPS control IC TEA1506P; TEA1506AP; TEA1506T; TEA1506AT Valley switching A new cycle starts when the power MOSFET is switched on (see Fig.9). After the ‘on-time’ (which is determined by the ‘sense’ voltage and the internal control voltage), the switch is opened and the secondary stroke starts. After the secondary stroke, the drain voltage shows an oscillation with a frequency of approximately where Lp is the primary self inductance of the transformer and Cd is the capacitance on the drain node. As soon as the oscillator voltage is high again and the secondary stroke has ended, the circuit waits for the lowest drain voltage before starting a new primary stroke. This method is called valley detection. Figure 9 shows the drain voltage together with the valley signal, the signal indicating the secondary stroke and the oscillator signal. In an optimum design, the reflected secondary voltage on the primary side will force the drain voltage to zero. Thus, zero voltage switching is very possible, preventing large capacitive switching losses and allowing high frequency operation, which results in small and cost effective inductors. 1 2 π × L p C d × () × ----------------------------------------------- P 1 2 --- CV 2 × f × × = handbook, full pagewidth drain secondary stroke MGU235 secondary ringing primary stroke valley BA secondary stroke oscillator A: Start of new cycle at lowest drain voltage. B: Start of new cycle in a classical PWM system at high drain voltage. Fig.9 Signals for valley switching. |
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