 |
Datenblatt-Suchmaschine für elektronische Bauteile |
|
|
Datenblatt-Suchmaschine für elektronische Bauteile |
|
LM2596 Datenblatt(PDF) 10 Page - ON Semiconductor |
|
||||||||||||||||||||||||||||||
LM2596 Datenblatt(HTML) 10 Page - ON Semiconductor |
|
|
10 / 25 page  LM2596 http://onsemi.com 10 PROCEDURE (ADJUSTABLE OUTPUT VERSION: LM2596) (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 18. 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 18. 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 = 27 [V x ms] C. ILoad(max) = 3.0 A Inductance Region = L40 D. Proper inductor value = 33 mH Choose the inductor from Table 3. E T + 12 * 5 * 1.5 5 ) 0.5 12 * 5 ) 0.5 1000 150 kHz V ms E T + 5.5 5.5 7.5 6.6 V ms 5. Output Capacitor Selection (Cout) A. Since the LM2596 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 220uFand 1500uF 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: 470 mF/35 V or 220 mF/35 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 40 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 15 nF or 5 nF. |
Ähnliche Teilenummer - LM2596_10 |
|
Ähnliche Beschreibung - LM2596_10 |
|
|
|
Link URL |
| Privatsphäre und Datenschutz |
| ALLDATASHEETDE.COM |
| War ALLDATASHEET hilfreich? [ DONATE ] |
Über Alldatasheet | Werbung | Kontakt | Privatsphäre und Datenschutz | Linktausch | Hersteller All Rights Reserved©Alldatasheet.com |
| Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
|
Family Site : ic2ic.com |
icmetro.com |
German ▼
English
Chinese
German
Japanese
Russian
Korean
Spanish
French
Italian
Portuguese
Polish
Vietnamese
Indian
Mexican
British
New Zealand
