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TPS61160DRVTG4 Datasheet(PDF) 21 Page - Texas Instruments |
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TPS61160DRVTG4 Datasheet(HTML) 21 Page - Texas Instruments |
21 / 39 page ![]() RIPPLE _ ESR OUT ESR V I R u OUT IN OUT OUT OUT S RIPPLE (V V )I C V F V u u 21 TPS61160, TPS61161 www.ti.com SLVS791E – NOVEMBER 2007 – REVISED JULY 2016 Product Folder Links: TPS61160 TPS61161 Submit Documentation Feedback Copyright © 2007–2016, Texas Instruments Incorporated provides much more output current and higher conversion efficiency. For these reasons, a 10-μH to 22-μH inductor value range is recommended. A 22-μH inductor optimized the efficiency for most application while maintaining low inductor peak-to-peak ripple. Table 4 lists the recommended inductor for the TPS61160 or TPS61161. When recommending inductor value, the factory has considered –40% and 20% tolerance from its nominal value. The TPS61160 and TPS61161 have built-in slope compensation to avoid sub-harmonic oscillation associated with current mode control. If the inductor value is lower than 10 μH, the slope compensation may not be adequate, and the loop can be unstable. Therefore, customers need to verify the inductor in their application if it is different from the recommended values. Table 4. Recommended Inductors for TPS61160 and TPS61161 PART NUMBER L (μH) DCR MAX ( Ω) SATURATION CURRENT (mA) SIZE (L × W × H mm) VENDOR LQH3NPN100NM0 10 0.3 750 3 ×3 ×1.5 Murata VLCF5020T-220MR75-1 22 0.4 750 5 ×5 × 2.0 TDK CDH3809/SLD 10 0.3 570 4 × 4 × 1.0 Sumida A997AS-220M 22 0.4 510 4 × 4 × 1.8 TOKO 8.2.1.2.3 Schottky Diode Selection The high switching frequency of the TPS61160, TPS61161 demands a high-speed rectification for optimum efficiency. Ensure that the diode average and peak current rating exceeds the average output current and peak inductor current. In addition, the diode’s reverse breakdown voltage must exceed the open LED protection voltage. The ONSemi MBR0540 and the ZETEX ZHCS400 are recommended for TPS61160 and TPS61161. 8.2.1.2.4 Compensation Capacitor Selection The compensation capacitor C3 (see the Functional Block Diagram), connected from COMP pin to GND, is used to stabilize the feedback loop of the TPS61160, TPS61161. A 220-nF ceramic capacitor for C3 is suitable for most applications. 8.2.1.2.5 Input and Output Capacitor Selection The output capacitor is mainly selected to meet the requirements for the output ripple and loop stability. This ripple voltage is related to the capacitor’s capacitance and its equivalent series resistance (ESR). Assuming a 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 additional output ripple component caused by ESR is calculated using: (7) Due to its low ESR, Vripple_ESR can be neglected for ceramic capacitors, but 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 a resonant frequencies in the range of the switching frequency. So the effective capacitance is significantly lower. The DC bias can also significantly reduce capacitance. Ceramic capacitors can loss as much as 50% of its capacitance at its rated voltage. Therefore, leave the margin on the voltage rating to ensure adequate capacitance at the required output voltage. The capacitor in the range of 1 μF to 4.7 μF is recommended for input side. The output requires a capacitor in the range of 0.47 μF to 10 μF. The output capacitor affects the loop stability of the boost regulator. If the output capacitor is below the range, the boost regulator can potentially become unstable. For example, when using an output capacitor of 0.1 μF, a 470-nF compensation capacitor has to be used for the loop stable. |
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