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EUP7915VIR1 Datasheet(PDF) 10 Page - Eutech Microelectronics Inc |
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EUP7915VIR1 Datasheet(HTML) 10 Page - Eutech Microelectronics Inc |
10 / 11 page EUP7915 DS7915 Ver1.4 Apr. 2008 10 On/Off Input Operation The EUP7915 is turned off by pulling the VEN pin low, and turned on by pulling it high. If this feature is not used, the VEN pin should be tied to VIN to keep the regulator output on at all time. To assure proper operation, the signal source used to drive the VEN input must be able to swing above and below the specified turn-on/off voltage thresholds listed in the Electrical Characteristics section under VIL and VIH. Fast Start up The EUP7915 output starts up after Vref voltage reaches its final value (1.2V nomial). The start-up time is determined by the time constant of the bypass capacitor. The smaller the capacitor value., the shorter the start-up time, but less noise gets reduced. As a result, start-up time and noise reduction need to be taken into design consideration when choosing the value of the bypass capacitor. |
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