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C3225X5R0J107MT Datasheet(PDF) 8 Page - Texas Instruments |
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C3225X5R0J107MT Datasheet(HTML) 8 Page - Texas Instruments |
8 / 24 page www.ti.com APPLICATION INFORMATION CAPACITOR RECOMMENDATIONS FOR THE PTH04040W POWER MODULE INPUT CAPACITOR OUTPUT CAPACITORS RECOMMENDED CERAMIC CAPACITORS TANTALUM CAPACITORS PTH04040W SLTS238A – SEPTEMBER 2005 – REVISED FEBRUARY 2006 The PTH04040W uses state-of-the-art multi-phase power converter topology that employs multiple parallel switching and filter inductor paths between the input and output capacitors. The PTH04040W uses three switching paths. The three paths share the total load current, operate at the same frequency, and are evenly displaced in phase. With multiple switching paths the transient output current capability is significantly increased. This reduces the amount of external output capacitance required to support a load transient. The ripple current, as seen by the input and output capacitors, is reduced in magnitude and effectively tripled in frequency. The improved transient response of a multi-phase converter places a bigger burden on the transient capability of the input source. The size and value of the input capacitor is therefore determined by this converter’s transient performance capability. The minimum amount of input capacitance required is 940 µF (2 × 470 µF or 3 × 330 µF), with an RMS ripple current rating of 400 mA. This minimum value assumes that the converter is supplied with a responsive, low-inductance input source. This source should have ample capacitive decoupling and be distributed the converter via PCB power and ground planes. For highperformance applications, or wherever the transient capability of the input source is limited, 2,200 µF of input capacitance is recommended. Ripple current and less than 100 m Ω equivalent series resistance (ESR) values are the major considerations, along with temperature, when designing with different types of capacitors. Unlike polymer tantalum, conventional tantalum capacitors have a recommended minimum voltage rating of 2 × (maximum dc voltage + ac ripple). This is standard practice to ensure reliability. For improved ripple reduction on the input bus, ceramic capacitors may be used to complement electrolytic types and achieve the minimum required capacitance. In order to respond with load transients (sudden changes in load current) the regulator requires external output capacitance. The minimum output capacitance is 660 µF (2 × 330 µF or 1 × 680 µF) with an ESR of at least 2 m Ω. This output capacitance is required for the module to meet its transient response specification. For most applications, a high quality computer grade aluminum electrolytic capacitor is suitable. These capacitors provide adequate decoupling over the frequency range, 2 kHz to 150 kHz, and when ambient temperatures are above 0 °C. For operation below 0°C, tantalum, ceramic, or Os-Con type capacitors are recommended. When using one or more nonceramic capacitors, the calculated equivalent ESR should be no lower than 4 m Ω 7 m Ω using the manufacturer’s maximum ESR for a single capacitor. A list of preferred low-ESR type capacitors are identified in Table 1. Above 150 kHz, the performance of aluminum electrolytic capacitors becomes less effective. To further improve, the reflected input ripple current or the output transient response, multilayer ceramic capacitors can also be added. Ceramic capacitors have very low ESR and their resonant frequency is higher than the bandwidth of the regulator. When used on the output their combined ESR is not critical as long as the total value of ceramic capacitance does not exceed 300 µF. Also, to prevent the formation of local resonances, do not place more than five identical ceramic capacitors in parallel with values of 10 µF or greater.. Tantalum type capacitors can be used at both the input and output, and are recommended for applications where the ambient operating temperature can be less than 0 °C. The AVX TPS, Sprague 593D/594/595, and Kemet T495/ T510 capacitor series are suggested over many other tantalum types due to their higher rated surge, power dissipation, and ripple current capability. As a caution, many general-purpose tantalum capacitors have considerably higher ESR, reduced power dissipation and lower ripple current capability. These capacitors are also less reliable when determining their power dissipation and surge current capability. Tantalum capacitors that do not have a stated ESR or surge current rating are not recommended for power applications. 8 Submit Documentation Feedback |
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