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LM2765 Datasheet(PDF) 7 Page - Texas Instruments |
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LM2765 Datasheet(HTML) 7 Page - Texas Instruments |
7 / 14 page LM2765 www.ti.com SNVS070C – MARCH 2000 – REVISED MAY 2013 CAPACITOR SELECTION As discussed in the Positive Voltage Doubler section, the output resistance and ripple voltage are dependent on the capacitance and ESR values of the external capacitors. The output voltage drop is the load current times the output resistance, and the power efficiency is (3) Where IQ(V+) is the quiescent power loss of the IC device, and IL 2R out is the conversion loss associated with the switch on-resistance, the two external capacitors and their ESRs. The selection of capacitors is based on the specifications of the dropout voltage (which equals Iout Rout), the output voltage ripple, and the converter efficiency. Low ESR capacitors (Table 1) are recommended to maximize efficiency, reduce the output voltage drop and voltage ripple. Table 1. Low ESR Capacitor Manufacturers Manufacturer Phone Website Capacitor Type Nichicon Corp. (847)-843-7500 www.nichicon.com PL & PF series, through-hole aluminum electrolytic AVX Corp. (843)-448-9411 www.avxcorp.com TPS series, surface-mount tantalum Sprague (207)-324-4140 www.vishay.com 593D, 594D, 595D series, surface-mount tantalum Sanyo (619)-661-6835 www.sanyovideo.com OS-CON series, through-hole aluminum electrolytic Murata (800)-831-9172 www.murata.com Ceramic chip capacitors Taiyo Yuden (800)-348-2496 www.t-yuden.com Ceramic chip capacitors Tokin (408)-432-8020 www.tokin.com Ceramic chip capacitors Other Applications PARALLELING DEVICES Any number of LM2765s can be paralleled to reduce the output resistance. Each device must have its own pumping capacitor C1, while only one output capacitor Cout is needed as shown in Figure 14. The composite output resistance is: (4) Figure 14. Lowering Output Resistance by Paralleling Devices Copyright © 2000–2013, Texas Instruments Incorporated Submit Documentation Feedback 7 Product Folder Links: LM2765 |
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