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SP6832 Datasheet(PDF) 9 Page - Sipex Corporation |
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SP6832 Datasheet(HTML) 9 Page - Sipex Corporation |
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9 / 15 page  9 SP6832DS/04 SP6832 High Speed, High Efficiency Voltage Inverter © Copyright 2000 Sipex Corporation the charge pump capacitors, and P CONV is the total conversion loss during charge transfer between the flying and output capacitors. These are the three theoretical factors that may effect the power efficiency of the SP6832 in designs. Internal losses come from the power dissipated in the IC's internal circuitry. Losses in the charge pump capacitors will be induced by the capacitors' ESR. The effects of the ESR losses and the output resistance can be found in the following equation: I OUT 2 x R OUT = PCAP + PCONV and R OUT ≈ 4 x (2 x RSWITCHES + ESRC1) + ESR C2 + 1 fOSC x C1 , where I OUT is the output current, ROUT is the circuit's output resistance, R SWITCHES is the internal resistance of the MOSFET switches, ESR C1 and ESR C2 are the ESR of their respective capacitors, and f OSC is the oscillator frequency. This term with f OSC is derived from an ideal switched- capacitor circuit as seen in Figure 17. Conversion losses will happen during the charge transfer between the flying capacitor, C1, and the output capacitor, C2, when there is a voltage difference between them. P CONV can be determined by the following equation: P CONV = fOSC x [ 1/ 2 x C1 x (VIN 2 - V OUT 2) + 1/ 2 x C2 x (VRIPPLE 2 - 2 x V OUT x VRIPPLE) ]. Actual Efficiency To determine the actual efficiency of the SP6832 device operation, a designer can use the following equation: Efficiency (ACTUAL) = x 100% P OUT P IN , where P OUT = VOUT x IOUT and P IN = VIN x IIN where P OUT is the power output, VOUT is the output voltage, I OUT is the output current, PIN is the power from the supply driving the SP6832, V IN is the supply input voltage, and IIN is the supply input current. Ideal Efficiency The ideal efficiency is not the true power efficiency because it is not calculated relative to the input power which includes the input current losses in the charge pump. The ideal efficiency can be determined with the following equation: Efficiency (IDEAL) = x 100% P OUT P OUT (IDEAL) , where P OUT (IDEAL) = -V IN x -V IN R L , and P OUT is the measured power output. Both efficiencies are provided to designers for comparison. Figure 17. Equivalent Circuit for an Ideal Switched Capacitor V+ C2 RL VOUT C1 f V+ C2 RL VOUT Requivalent = 1 f x C1 Requivalent |
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