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DCH010505SN7 Datasheet(PDF) 10 Page - Texas Instruments |
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DCH010505SN7 Datasheet(HTML) 10 Page - Texas Instruments |
10 / 15 page +V IN DCH01xxxxDN7 -V IN +V OUT COM 2.2 m F Ceramic 1 m H to 5 m H 4.7 m F Ceramic +V IN -V IN 4.7 m F 1 m H to 5 m H 1 m F -V OUT 4.7 m F 1 m F 1 m H to 5 m H +V OUT -V OUT UDG-08076 π FILTERS DCH01 START-UP I IN 100mA/div V O 5V/div V IN 5V/div DCH01 Series SBVS073H – NOVEMBER 2006 – REVISED JANUARY 2009........................................................................................................................................... www.ti.com Figure 21. DCH01 Series π Filter (5 V at 1 W) If a further reduction in ripple/noise level is required for an application, higher order filters must be used. A π (pi) filter, employing a ferrite bead inductor in series with the input or output terminals of the regulator reduces the ripple/noise by at least 20 db (see Figure 20 and Figure 21). Ceramic capacitors are required for the inductor to be effective in reduction of ripple and noise. These inductors plus ceramic capacitors form an excellent filter because of the rejection at the switching frequency. The placement of this filter is critical. It must be located as close as possible to the input or output pins to be efffective. The ferrite bead is small (12,5 mm x 3 mm), easy to use, low cost, and has low dc resistance. Fair-Rite manufactures a surface-mount bead (part number 2773021447) or through hole (part number 2673000701) rated to 5 A. Inductors with a value between 1 µH and 5 µH can be used in place of the ferrite bead inductor. Start-up waveforms. Figure 22. Startup Waveforms 10 Submit Documentation Feedback Copyright © 2006–2009, Texas Instruments Incorporated Product Folder Link(s): DCH01 Series |
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