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LM2767 Datasheet(PDF) 7 Page - Texas Instruments |
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LM2767 Datasheet(HTML) 7 Page - Texas Instruments |
7 / 16 page LM2767 www.ti.com SNVS069C – FEBRUARY 2000 – REVISED MAY 2013 The selection of capacitors is based on the allowable voltage droop (which equals Iout Rout), and the desired output voltage ripple. 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 PARALLELING DEVICES Any number of LM2767s can be paralleled to reduce the output resistance. Since there is no closed loop feedback, as found in regulated circuits, stable operation is assured. Each device must have its own pumping capacitor C1, while only one output capacitor Cout is needed as shown in Figure 15. The composite output resistance is: (4) Figure 15. Lowering Output Resistance by Paralleling Devices CASCADING DEVICES Cascading the LM2767s is an easy way to produce a greater voltage (A two-stage cascade circuit is shown in Figure 16). The effective output resistance is equal to the weighted sum of each individual device: Rout = 1.5Rout_1 + Rout_2 (5) Note that increasing the number of cascading stages is pracitically limited since it significantly reduces the efficiency, increases the output resistance and output voltage ripple. Copyright © 2000–2013, Texas Instruments Incorporated Submit Documentation Feedback 7 Product Folder Links: LM2767 |
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