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LMZ10505TZ-ADJ Datasheet(PDF) 11 Page - National Semiconductor (TI) |
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LMZ10505TZ-ADJ Datasheet(HTML) 11 Page - National Semiconductor (TI) |
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11 / 22 page  TABLE 1. Recommended Output Filter Capacitors C O (µF) Voltage (V), R ESR (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 V OUT to the FB pin determines the desired output voltage as follows: R fbt is defined based on the voltage loop requirements and R fbb is then selected for the desired output voltage. Resistors are normally selected as 0.5% or 1% tolerance. Higher accu- racy resistors such as 0.1% are also available. The feedback voltage (at V OUT = 2.5V) is accurate to within -2.5% / +2.5% over temperature and over line and load reg- ulation. Additionally, the LMZ10505 contains error nulling circuitry to substantially eliminate the feedback voltage vari- ation 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 op- erating points, each evident every other switching cycle. Loop Compensation The LMZ10505 preserves flexibility by integrating the control components around the internal error amplifier while utilizing three small external compensation components from V OUT to FB. An integrated type II (two pole, one zero) voltage-mode compensation network is featured. To ensure stability, an ex- ternal 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. In general, calculated output capacitance values below the suggested value will have reduced phase margin and higher control loop bandwidth. Output capacitance val- ues above the suggested values will experience a lower bandwidth and increased phase margin. Higher bandwidth is associated with faster system response to sudden changes such as load transients. Phase margin changes the charac- teristics of the response. Lower phase margin is associated with underdamped ringing and higher phase margin is asso- ciated with overdamped response. Losing all phase margin will cause the system to be unstable; an optimized area of operation is 30° to 60° of phase margin, with a bandwidth of 100 kHz ±20 kHz. 30107408 TABLE 2. LMZ10505 Compensation Component Values V IN (V) C O (µF) ESR (m Ω) R fbt (k Ω) C comp (pF) R comp (k Ω) Min Max 5.0 22 2 20 200 27 1.5 47 2 20 124 56 1.4 100 1 10 82.5 120 1 150 1 5 63.4 180 1.21 150 10 25 63.4 220 16.5 150 26 50 44.2 220 23.7 220 15 30 63.4 220 23.7 220 31 60 76.8 220 57.6 3.3 22 2 20 118 39 9.09 47 2 20 76.8 82 8.45 100 1 10 49.9 180 4.12 150 1 5 40.2 330 2.0 150 10 25 43.2 330 11.5 150 26 50 49.9 270 25.5 220 15 30 40.2 390 15.4 220 31 60 48.7 330 35.7 Note: In the special case where the output voltage is 0.8V, it is recom- mended to remove R fbb and keep Rfbt, Rcomp, and Ccomp for a type III compensation. 11 www.national.com |
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