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TPS610994YFFT Datasheet(PDF) 14 Page - Texas Instruments |
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TPS610994YFFT Datasheet(HTML) 14 Page - Texas Instruments |
14 / 23 page OUT LH IN OUT IN V I L ) V V ( V f ˜ ˜ K ˜ ˜ 14 TPS61099, TPS610994, TPS610997 SLVSD88C – JULY 2016 – REVISED JANUARY 2017 www.ti.com Product Folder Links: TPS61099 TPS610994 TPS610997 Submit Documentation Feedback Copyright © 2016–2017, Texas Instruments Incorporated (1) See Third-Party Products disclaimer where • IL,peak is the peak inductor current. (4) The inductor's saturation current must be higher than the calculated peak inductor current. Table 2 lists the recommended inductors for TPS61099x device. After choosing the inductor, the estimated switching frequency ƒ in continuous current mode can be calculated by Equation 5. The switching frequency is not a constant value, which is determined by L, VIN and VOUT. (5) Table 2. List of Inductors(1) VOUT [V] INDUCTANCE [µH] SATURATION CURRENT [A] DC RESISTANCE [mΩ] SIZE (LxWxH) PART NUMBER MANUFACTURER > 3.0 2.2 1.95 80 2.5 x 2.0 x 1.2 74404024022 Würth Elektronik 2.2 1.7 92 2.5 x 2.0 x 1.1 LQH2HPN2R2MJR muRata 2.2 1.45 163 2.0 x 1.6 x 1.0 VLS201610CX-2R2M TDK ≤ 3.0 1.0 2.6 37 2.5 x 2.0 x 1.2 74404024010 Würth Elektronik 1.0 2.3 48 2.5 x 2.0 x 1.0 MLP2520W1R0MT0S1 TDK 1.0 1.5 80 2.0 x 1.2 x 1.0 LQM21PN1R0MGH muRata 9.2.1.1.5 Capacitor Selection For best output and input voltage filtering, low ESR X5R or X7R ceramic capacitors are recommended. The input capacitor minimizes input voltage ripple, suppresses input voltage spikes and provides a stable system rail for the device. An input capacitor value of 10 μF is normally recommended to improve transient behavior of the regulator and EMI behavior of the total power supply circuit. A ceramic capacitor placed as close as possible to the VIN and GND pins of the IC is recommended. For the output capacitor of VOUT pin, small ceramic capacitors are recommended, placed as close as possible to the VOUT and GND pins of the IC. If, for any reason, the application requires the use of large capacitors which cannot be placed close to the IC, the use of a small ceramic capacitor with a capacitance value of 1 μF in parallel to the large one is recommended. This small capacitor should be placed as close as possible to the VOUT and GND pins of the IC. From the power stage point of view, the output capacitor sets the corner frequency of the converter while the inductor creates a Right-Half-Plane-Zero. Consequently, with a larger inductor, a larger output capacitor must be used. The TPS61099x is optimized to work with the inductor from 1 µH to 2.2 µH, so the minimal output capacitor value is 20 μF (nominal value). Increasing the output capacitor makes the output ripple smaller in PWM mode. When selecting capacitors, ceramic capacitor’s derating effect under bias should be considered. Choose the right nominal capacitance by checking capacitor's DC bias characteristics. In this example, GRM188R60J106ME84D, which is a 10-µF ceramic capacitor with high effective capacitance value at DC biased condition, is selected for VOUT rail. The performance of TPS61099x is shown in Application Curves section. |
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