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TPS61093-Q1 Datasheet(PDF) 13 Page - Texas Instruments |
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TPS61093-Q1 Datasheet(HTML) 13 Page - Texas Instruments |
13 / 27 page out out ripple D I C = Fs V ´ ´ L L_peak L_DC L_DC L SW I I = I + 2 Vout Iout I = Vin 1 I = 1 1 L + Vout + 0.8 V VIN VIN D ´ ´ h D é ù æ ö ´ ¦ ´ ê ú ç ÷ - è ø ë û TPS61093-Q1 www.ti.com SLVSCO6 – JANUARY 2015 9.2.1.2.5 Inductor Selection Because the selection of the inductor affects steady state operation, transient behavior, and loop stability, the inductor is the most important component in power regulator design. There are three important inductor specifications, inductor value, saturation current, and dc resistance. Considering inductor value alone is not enough. The saturation current of the inductor should be higher than the peak switch current as calculated in Equation 5. where • IL_peak = Peak switch current • IL_DC = Inductor average current • ΔIL = Inductor peak to peak current • η = Estimated converter efficiency (5) Normally, it is advisable to work with an inductor peak-to-peak current of less than 30% of the average inductor current. A smaller ripple from a larger valued inductor reduces the magnetic hysteresis losses in the inductor and EMI. But in the same way, load transient response time is increased. Also, the inductor value should not be outside the 2.2- μH to 10-μH range in the recommended operating conditions table. Otherwise, the internal slope compensation and loop compensation components are unable to maintain small signal control loop stability over the entire load range. Table 3 lists the recommended inductor for the TPS61093-Q1. Table 3. Recommended Inductors for the TPS61093-Q1 Part Number L ( μH) DCR Max (m Ω) Saturation Current (A) Size (L×W×H mm) Vendor #A915_Y-4R7M 4.7 45 1.5 5.2x5.2x3.0 Toko #A915_Y-100M 10 90 1.09 5.2x5.2x3.0 Toko VLS4012-4R7M 4.7 132 1.1 4.0x4.0x1.2 TDK VLS4012-100M 10 240 0.82 4.0x4.0x1.2 TDK CDRH3D23/HP 10 198 1.02 4.0x4.0x2.5 Sumida LPS5030-103ML 10 127 1.4 5.0x5.0x3.0 Coilcraft 9.2.1.2.6 Input And Output Capacitor Selection The output capacitor is mainly selected to meet the requirements for output ripple and loop stability. This ripple voltage is related to the capacitor’s capacitance and its equivalent series resistance (ESR). Assuming a ceramic capacitor with zero ESR, the minimum capacitance needed for a given ripple can be calculated by: where • Vripple = peak to peak output ripple (6) The ESR impact on the output ripple must be considered if tantalum or electrolytic capacitors are used. Care must be taken when evaluating a ceramic capacitor’s derating under dc bias, aging, and ac signal. For example, larger form factor capacitors (in 1206 size) have their self resonant frequencies in the range of the switching frequency. So the effective capacitance is significantly lower. The dc bias can also significantly reduce capacitance. A ceramic capacitor can lose as much as 50% of its capacitance at its rated voltage. Therefore, always leave margin on the voltage rating to ensure adequate capacitance at the required output voltage. Copyright © 2015, Texas Instruments Incorporated Submit Documentation Feedback 13 Product Folder Links: TPS61093-Q1 |
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