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LM2594DADJR2G Datasheet(PDF) 10 Page - ON Semiconductor |
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LM2594DADJR2G Datasheet(HTML) 10 Page - ON Semiconductor |
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10 / 25 page  LM2594 http://onsemi.com 10 PROCEDURE (ADJUSTABLE OUTPUT VERSION: LM2594) (CONTINUED) Procedure Example 4. Inductor Selection (L1) A. Use the following formula to calculate the inductor Volt x microsecond [V x ms] constant: B. Match the calculated E x T value with the corresponding number on the vertical axis of the Inductor Value Selection Guide shown in Figure 19. This E x T constant is a measure of the energy handling capability of an inductor and is dependent upon the type of core, the core area, the number of turns, and the duty cycle. C. Next step is to identify the inductance region intersected by the E x T value and the maximum load current value on the horizontal axis shown in Figure 19. D. Select an appropriate inductor from Table 3. The inductor chosen must be rated for a switching frequency of 150 kHz and for a current rating of 1.15 x ILoad. The inductor current rating can also be determined by calculating the inductor peak current: where ton is the “on” time of the power switch and E T + VIN * VOUT * VSAT VOUT ) VD VIN * VSAT ) VD 1000 150 kHz V ms Ip(max) + ILoad(max) ) Vin *Vout ton 2L ton + Vout Vin x 1.0 fosc 4. Inductor Selection (L1) A. Calculate E x T [V x ms] constant: B. E x T = 19.2 [V x ms] C. ILoad(max) = 0.5 A Inductance Region = L20 D. Proper inductor value = 100 mH Choose the inductor from Table 3. E T + 12 * 5 * 1.0 5 ) 0.5 12 * 1 ) 0.5 1000 150 kHz V ms E T + 6 5.5 11.5 6.7 V ms 5. Output Capacitor Selection (Cout) A. Since the LM2594 is a forward−mode switching regulator with voltage mode control, its open loop has 2−pole−1−zero frequency characteristic. The loop stability is determined by the output capacitor (capacitance, ESR) and inductance values. For stable operation use recommended values of the output capacitors in Table 1. Low ESR electrolytic capacitors between 180 mF and 1000 mF provide best results. B. The capacitors voltage rating should be at least 1.5 times greater than the output voltage, and often much higher voltage rating is needed to satisfy low ESR requirement 5. Output Capacitor Selection (Cout) A. In this example is recommended Nichicon PM capacitors: 220 mF/25 V 6. Feedforward Capacitor (CFF) It provides additional stability mainly for higher input voltages. For Cff selection use Table 1. The compensation capacitor between 0.6 nF and 15 nF is wired in parallel with the output voltage setting resistor R2, The capacitor type can be ceramic, plastic, etc.. 6. Feedforward Capacitor (CFF) In this example is recommended feedforward capacitor 1.5 nF. |
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