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SP6661EN/TR Datasheet(PDF) 4 Page - Exar Corporation |
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SP6661EN/TR Datasheet(HTML) 4 Page - Exar Corporation |
4 / 8 page Date: 09/16/04 SP6661 High Frequency 200mA Charge Pump Inverter or Doubler © Copyright 2004 Sipex Corporation 4 Optimizing Capacitor Selection Refer to Figure 1 for the total output resistance for various capacitance values and oscillator frequencies. The reservoir and charge pump capacitor values are equal. The capacitance values required to maintain comparable ripple and output resistance typically diminish proportionately as the pump frequency of the SP6661 increases. 0 2 4 6 8 10 12 14 16 18 20 110 100 1000 C1, C2 Capacitance (uF) 10KHz 20KHz 50KHz 100KHz 200KHz 500KHz 1000KHz Figure 1. Total Output Resistance for various capacitance values and oscillator frequen- cies. |
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