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LM828M5X Datasheet(PDF) 6 Page - Texas Instruments |
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LM828M5X Datasheet(HTML) 6 Page - Texas Instruments |
6 / 15 page LM828 SNOS035D – MARCH 2010 – REVISED MAY 2013 www.ti.com (2) Again, using a low ESR capacitor will result in lower ripple. CAPACITOR SELECTION 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 (following table) are recommended to maximize efficiency, reduce the output voltage drop and voltage ripple. Low ESR Capacitor Manufacturers Manufacturer Phone Capacitor Type Nichicon Corp. (708)-843-7500 PL & PF series, through-hole aluminum electrolytic AVX Corp. (803)-448-9411 TPS series, surface-mount tantalum Sprague (207)-324-4140 593D, 594D, 595D series, surface-mount tantalum Sanyo (619)-661-6835 OS-CON series, through-hole aluminum electrolytic Murata (800)-831-9172 Ceramic chip capacitors Taiyo Yuden (800)-348-2496 Ceramic chip capacitors Tokin (408)-432-8020 Ceramic chip capacitors Other Applications PARALLELING DEVICES Any number of LM828s 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 13. The composite output resistance is: (4) Figure 13. Lowering Output Resistance by Paralleling Devices 6 Submit Documentation Feedback Copyright © 2010–2013, Texas Instruments Incorporated Product Folder Links: LM828 |
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