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SP6831EK Datasheet(PDF) 10 Page - Sipex Corporation |
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SP6831EK Datasheet(HTML) 10 Page - Sipex Corporation |
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10 / 16 page  10 Rev. 9-22-00 SP6830/6831 Low Power Voltage Inverters With Shutdown © Copyright 2000 Sipex Corporation 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 SP6830/6831 devices in designs. Any internal losses come from the IC's on board circuitry. Losses in the IC can be induced by the input voltage, the frequency of the oscillator, and the ambient temperature. The most influential internal loss in the IC may be found in the power- on resistance of the internal MOSFET switches. Any of the losses with the charge pump capacitors will be induced by the capacitor's ESR. The affects 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 it 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 19. Any losses due to the conversion process 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 - 2V OUTVRIPPLE) ]. Actual Efficiency To determine the actual efficiency of the SP6830/ 6831 device operation, a designer can use the following equation: Efficiency (actual) = x 100% POUT PIN , 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 SP6830/ 6831 devices, V IN is the supply input voltage, and I IN is the supply input current. Ideal Efficiency The ideal efficiency is not the true power efficiency because it does not involve 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% POUT POUT(IDEAL) , where POUT(IDEAL) = -VIN x -VIN RL , Figure 19. 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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