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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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L6563S датащи(PDF) 32 Page - STMicroelectronics |
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L6563S датащи(HTML) 32 Page - STMicroelectronics |
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32 / 42 page  Application information L6563S 32/42 Doc ID 16116 Rev 3 Figure 44. Interface circuits that let the L6563S switch on or off a PWM controller If the chip is provided with a soft-start pin, it is possible to delay the start-up of the dc-dc stage with respect to that of the PFC stage, which is often desired, as described in Figure 45 . An underlying assumption in order for that to work properly is that the UVLO thresholds of the PWM controller are certainly higher than those of the L6563S. Figure 45. Interface circuits for power up sequencing when dc-dc has the SS function If this is not the case or it is not possible to achieve a start-up delay long enough (because this prevents the dc-dc stage from starting up correctly) or, simply, the PWM controller is devoid of soft start, the arrangement of Figure 46 lets the dc-dc converter start-up when the voltage generated by the PFC stage reaches a preset value. The technique relies on the UVLO thresholds of the PWM controller. |
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