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LD3986J2830R-E 数据表(PDF) 9 Page - STMicroelectronics |
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LD3986J2830R-E 数据表(HTML) 9 Page - STMicroelectronics |
9 / 12 page LD3986 SERIES 9/12 source used to drive the EN input must be able to swing above and below the specified turn-on/off voltage thresholds listed in the Electrical Characteristics section under Enable Input Logic Low and Enable Input Logic High. Proper operation of the Enable function is guaranteed by driving EN pins with TR and TF = 10 ms. FAST ON-TIME The LD3986 outputs are turned on after VREF voltage reaches its final value (1.23V nominal). To speed up this process, the noise reduction capacitor at the bypass pin is charged with an internal 70µA current source. The current source is turned off when the bandgap voltage reaches approximately 95% of its final value. The turn on time is determined by the time constant of the bypass capacitor. The smaller the capacitor value, the shorter the turn on time, but less noise gets reduced. As a result, turn on time and noise reduction need to be taken into design consideration when choosing the value of the bypass capacitor. |
类似零件编号 - LD3986J2830R-E |
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类似说明 - LD3986J2830R-E |
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