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HCF4538B Arkusz danych(PDF) 8 Page - STMicroelectronics |
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HCF4538B Arkusz danych(HTML) 8 Page - STMicroelectronics |
8 / 14 page Power Down Mode During a rapid power-down conditiona, as would occur with a power supply short circuit or with a poorly filtered power supply, the energy stored in CX could discharge into Pin 2 or 14. To Avoid possible device damage in this mode, when CX is ≤0.5micro- farad, a aprotection diode with a 1 Ampere or higher rating (1N5395 or equivalent) and a separate ground return for CX should be provided as shown in Fig. 1 An alternate protection method is shown in Fig. 2, where a 51 Ω current limit resistor is inserted in series with CX. Note that a small pulse width de- crease will occour however, and RX must be appro- priately increased to obtain the originally desired pulse width. Figure 1: rapid Power Down Protection Circuit Figure 2: Alternate rapid Power Down Protection Circuit HCC/HCF4538B 8/14 |
Podobny numer części - HCF4538B |
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Podobny opis - HCF4538B |
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