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LMZ10503 bảng dữ liệu(PDF) 11 Page - Texas Instruments |
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LMZ10503 bảng dữ liệu(HTML) 11 Page - Texas Instruments |
11 / 28 page VOUT = 0.8V x Rfbt + Rfbb Rfbb Co 8 42 µF Co 8 2.4A x 0.8V x 2.2 µH x 5V 4 x 2.5V x (5V - 2.5V) x 20 mV Istep x VFB x L x VIN 4 x VOUT x (VIN - VOUT) x 'Vo_tran CO t LMZ10503 www.ti.com SNVS641H – JANUARY 2010 – REVISED APRIL 2013 (11) Where Istep is the peak to peak load step (for this example Istep = 10% to 90% of the maximum load), VFB = 0.8V, and ΔVo_tran is the maximum output voltage deviation, which is ±20 mV. Therefore the capacitance requirement for the given design parameters is: (12) (13) In this particular design the output capacitance is determined by the load transient requirements. Table 1 lists some examples of commercially available capacitors that can be used with the LMZ10503. Table 1. Recommended Output Filter Capacitors CO (µF) Voltage (V), RESR (mΩ) Make Manufacturer Part Number Case Size 22 6.3, < 5 Ceramic, X5R TDK C3216X5R0J226M 1206 47 6.3, < 5 Ceramic, X5R TDK C3216X5R0J476M 1206 47 6.3, < 5 Ceramic, X5R TDK C3225X5R0J476M 1210 47 10.0, < 5 Ceramic, X5R TDK C3225X5R1A476M 1210 100 6.3, < 5 Ceramic, X5R TDK C3225X5R0J107M 1210 100 6.3, 50 Tantalum AVX TPSD157M006#0050 D, 7.5 x 4.3 x 2.9 mm 100 6.3, 25 Organic Polymer Sanyo 6TPE100MPB2 B2, 3.5 x 2.8 x 1.9 mm 150 6.3, 18 Organic Polymer Sanyo 6TPE150MIC2 C2, 6.0 x 3.2 x 1.8 mm 330 6.3, 18 Organic Polymer Sanyo 6TPE330MIL D3L, 7.3 x 4.3 x 2.8 mm 470 6.3, 23 Niobium Oxide AVX NOME37M006#0023 E, 7.3 x 4.3 x 4.1 mm Output Voltage Setting A resistor divider network from VOUT to the FB pin determines the desired output voltage as follows: (14) Rfbt is defined based on the voltage loop requirements and Rfbb is then selected for the desired output voltage. Resistors are normally selected as 0.5% or 1% tolerance. Higher accuracy resistors such as 0.1% are also available. The feedback voltage (at VOUT = 2.5V) is accurate to within -2.5% / +2.5% over temperature and over line and load regulation. Additionally, the LMZ10503 contains error nulling circuitry to substantially eliminate the feedback voltage variation over temperature as well as the long term aging effects of the internal amplifiers. In addition the zero nulling circuit dramatically reduces the 1/f noise of the bandgap amplifier and reference. The manifestation of this circuit action is that the duty cycle will have two slightly different but distinct operating points, each evident every other switching cycle. Loop Compensation The LMZ10503 preserves flexibility by integrating the control components around the internal error amplifier while utilizing three small external compensation components from VOUT to FB. An integrated type II (two pole, one zero) voltage-mode compensation network is featured. To ensure stability, an external resistor and small value capacitor can be added across the upper feedback resistor as a pole-zero pair to complete a type III (three pole, two zero) compensation network. The compensation components recommended in Table 2 provide type III compensation at an optimal control loop performance. The typical phase margin is 45° with a bandwidth of 80 kHz. Calculated output capacitance values not listed in Table 2 should be verified before designing into production. A detailed application note is available to provide verification support, AN-2013 (SNVA417). In general, calculated output capacitance values below the suggested value will have reduced phase margin and higher control loop bandwidth. Output capacitance values above the suggested values will experience a lower Copyright © 2010–2013, Texas Instruments Incorporated Submit Documentation Feedback 11 Product Folder Links: LMZ10503 |
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