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TEA1520P Datenblatt(PDF) 6 Page - NXP Semiconductors |
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TEA1520P Datenblatt(HTML) 6 Page - NXP Semiconductors |
6 / 17 page TEA152X_3 © NXP B.V. 2009. All rights reserved. Product data sheet Rev. 03 — 23 March 2009 6 of 17 NXP Semiconductors TEA152x SMPS ICs for low-power systems 8.4 Valley switching A new cycle is started when the primary switch is switched on (see Figure 4). After a certain time (determined by the oscillator voltage RC and the internal regulation level), the switch is turned off and the secondary stroke starts. The internal regulation level is determined by the voltage on pin REG. After the secondary stroke, the drain voltage shows an oscillation with a frequency of approximately: (1) where: Lp = primary self inductance Cp = parasitic capacitance on drain node As soon as the oscillator voltage is high again and the secondary stroke has ended, the circuit waits for a low drain voltage before starting a new primary stroke. Figure 4 shows the drain voltage together with the valley signal, the signal indicating the secondary stroke and the RC voltage. The primary stroke starts some time before the actual valley at low ringing frequencies, and some time after the actual valley at high ringing frequencies. A: Start of new cycle with valley switching. B: Start of new cycle in a classical PWM system. Fig 4. Signals for valley switching 1 2 π × L p C p × () × ----------------------------------------------- mgt423 drain valley secondary ringing secondary stroke primary stroke secondary stroke RC oscillator regulation level A B |
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