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NCN6010 Datasheet(PDF) 11 Page - ON Semiconductor |
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NCN6010 Datasheet(HTML) 11 Page - ON Semiconductor |
11 / 16 page NCN6010 http://onsemi.com 11 Figure 10. Basic Charge Pump Operating Timings SIM_VCC = 5.0 V S1 S2 S3 S4 S5 SIM_VCC = 3.0 V MOD_VCC When the NCN6010 is programmed in the 5.0 V output voltage, the clocks are activated, switch S5 is disconnected and the output voltage is the result of the C1 charge transfer into the output load. The current is limited by three mains parameters: – the Ron of the switching MOS (S1 through S4) – the operating frequency – the C1/C2 ratio and their ESR The first parameters are depending upon the internal structure and size of the NMOS/PMOS devices used to design the chip. The third parameter is adjustable by the user and, beside the micro farad values, the type of capacitors plays a significant role. As a matter of fact, using a low cost electrolytic model will ruin the efficiency due to the high ESR of such a capacitor. It is highly recommended to use ceramic types, preferably from the X5R or X7R series, to achieve the efficiency and the SIM_VCC output voltage ripple. Table 2 summarizes the characteristics of the most common type of capacitors. Table 2. Comparison of Capacitor Types Manufacturers Type/Serie Format Max Value Tolerance Typ. Z @ 500 kHz MURATA CERAMIC/GRM225 0805 10 mF/6.3 V +80%/–20% 30 m W VISHAY Tantalum/594C/593C 1206 10 mF/16 V – 450 m W VISHAY Electrolytic/94SV 1206 10 mF/10 V –20%/+20% 400 m W |
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