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NCP623MN-33R2G Datasheet(PDF) 7 Page - ON Semiconductor |
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NCP623MN-33R2G Datasheet(HTML) 7 Page - ON Semiconductor |
7 / 15 page NCP623, NCV8623 www.onsemi.com 7 NCP623 Wake−up Improvement − In portable applications, an immediate response to an enable signal is vital. If noise is not a concern, the NCP623 without a bypass capacitor settles in nearly 20 ms and typically delivers 65 mVRMS between 100 Hz and 100 kHz. In ultra low−noise systems, the designer needs a 10 nF bypass capacitor to decrease the noise down to 25 mVRMS between 100 Hz and 100 kHz. With the addition of the 10 nF capacitor, the wake−up time expands up to 1.0 ms as shown on the data−sheet curves. If an immediate response is wanted, Figure 3 provides a solution to charge the bypass capacitor with the enable signal without degrading the noise response of the NCP623. At power−on, C4 is discharged. When the control logic sends its wake−up signal by going high, the PNP base is momentarily tied to ground. The PNP switch closes and immediately charges the bypass capacitor C1 toward its operating value. After a few ms, the PNP opens and becomes totally transparent to the regulator. This circuit improves the response time of the regulator which drops from 1.0 ms down to 30 ms. The value of C4 needs to be tweaked in order to avoid any bypass capacitor overload during the wake−up transient. Figure 3. A PNP Transistor Drives the Bypass Pin when Enable Goes High 13 NCP623 + + C2 1.0 mF C3 1.0 mF Input Output C4 470 pF C1 10 nF R2 220 k MMBT2902LT1 Q1 On/Off 2 64 5 |
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