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TEA1523P 数据表(PDF) 6 Page - NXP Semiconductors |
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TEA1523P 数据表(HTML) 6 Page - NXP Semiconductors |
6 / 20 page TEA152X All information provided in this document is subject to legal disclaimers. © NXP B.V. 2010. All rights reserved. Product data sheet Rev. 04 — 14 September 2010 6 of 20 NXP Semiconductors TEA152x SMPS ICs for low-power systems 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. Figure 5 shows a typical curve for a reflected output voltage N × V o of 80 V. This voltage is the output voltage Vo (see Figure 6) transferred to the primary side of the transformer with the factor N (determined by the turns ratio of the transformer). Figure 5 shows that the system switches exactly at minimum drain voltage for ringing frequencies of 480 kHz, thus reducing the switch-on losses to a minimum. At 200 kHz, the next primary stroke is started at 33 ° before the valley. The switch-on losses are still reduced significantly. A: Start of new cycle with valley switching B: Start of new cycle in a classical PWM system Fig 4. Signals for valley switching mgt423 drain valley secondary ringing secondary stroke primary stroke secondary stroke RC oscillator regulation level A B |
类似零件编号 - TEA1523P |
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类似说明 - TEA1523P |
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