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SP6830 Datasheet(PDF) 11 Page - Sipex Corporation |
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SP6830 Datasheet(HTML) 11 Page - Sipex Corporation |
11 / 16 page 11 Rev. 9-22-00 SP6830/6831 Low Power Voltage Inverters With Shutdown © Copyright 2000 Sipex Corporation and P OUT is the the power output. Both efficiencies are provided to designers for comparison. APPLICATION INFORMATION For the following applications, C1 = C2 = C3 = 3.3 µF for the SP6830 and C1 = C2 = C3 = 1.0µF for the SP6831. Capacitor Selection Low ESR capacitors are needed to obtain low output resistance. Refer to Table 1 for some suggested low ESR capacitors. The output resistance of the SP6830/6831 devices is a function of the ESR of C1 and C2. This output resistance can be determined by the equation previously provided in the Efficiency section: R OUT ≈ 4 x (2 x RSWITCHES + ESRC1) + ESR C2 + 1 fOSC x C1 , where R OUT is the circuit's output resistance, R SWITCHES is the internal resistance of the MOSFET switches, ESR C1 and ESRC2 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. Minimizing the ESR of C1 and C2 will minimize the total output resistance and will improve the efficiency. Flying Capacitor Decreasing flying capacitor, C1, values will increase the output resistance of the SP6830/ 6831 devices while increasing C1 will reduce the output resistance. There is a point where increasing C1 will have a negligible effect on the output resistance due to the the domination of the output resistance by the internal MOSFET switch resistance and the total capacitor ESR. Output Capacitor Increasing output capacitor, C2, values will decrease the output ripple voltage. Reducing the ESR of C2 will reduce both output ripple voltage and output resistance. If higher output ripple can be tolerated in designs, smaller capacitance values for C2 should be used with light loads. The following equation can be used to calculate the peak-to-peak ripple voltage: VRIPPLE = 2 x IOUT x ESRC2 + IOUT fOSC x C2 . Input Bypass Capacitor The bypass capacitor at the input voltage will reduce AC impedance and the impact of any of the SP6830/6831 device's switching noise. It is recommended that for heavy loads a bypass capacitor approximately equal to the flying capacitor, C1, be used. For light loads, the value of the bypass capacitor can be reduced. Table 1. Suggested Low ESR Surface Mount Capacitors T R A P X E P I S R E B M U N / R E R U T C A F U N A M # E N O H P E L E T R E B M U N T R A P / E C N A T I C A P A C E G A T L O V R S E X A M z H k 0 0 1 @ R O T I C A P A C E P Y T / E Z I S 0 3 8 6 P S / T E M E K 0 0 3 6 - 3 6 9 - 4 6 8 0 2 0 * 5 3 3 B 4 9 4 TV 0 2 / F µ 3 . 35 . 1 Ω / B e s a C m u l a t n a T 0 3 8 6 P S / E U G A R P S 0 4 1 4 - 4 2 3 - 7 0 2 5 3 0 0 X 5 3 3 D 5 9 5V 5 3 / F µ 3 . 30 . 2 Ω / C e s a C m u l a t n a T 0 3 8 6 P S / K D T 0 0 1 6 - 3 0 8 - 7 4 8 K 5 3 3 A 1 R 5 X 6 1 2 3 CV 0 1 / F µ 3 . 34 0 . 0 Ω R 5 X / 6 0 2 1 1 3 8 6 P S / X V A 1 1 4 9 - 8 4 4 - 3 4 8 K 5 0 1 C Z 5 0 8 0V 0 1 / F µ 14 0 . 0 Ω R 7 X / 5 0 8 0 1 3 8 6 P S / T E M E K 0 0 3 6 - 3 6 9 - 4 6 8 C A R K 5 0 1 C 5 0 8 0 CV 0 1 / F µ 15 0 . 0 Ω R 7 X / 5 0 8 0 1 3 8 6 P S / K D T 0 0 1 6 - 3 0 8 - 7 4 8 K 5 0 1 A 1 R 5 X 2 1 0 2 CV 0 1 / F µ 15 0 . 0 Ω R 5 X / 5 0 8 0 |
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