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AMC2576-ADJDDF датащи(PDF) 9 Page - ADDtek Corp |
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AMC2576-ADJDDF датащи(HTML) 9 Page - ADDtek Corp |
9 / 14 page AMC2576 Copyright © 2006 ADDtek Corp. 9 DD007_E -- DECEMBER 2006 APPLICATION INFORMATION (contd.) Output Voltage Ripple and Transients The output ripple voltage is due mainly to the inductor saw tooth ripple current multiplied by the ESR of the output capacitor. The output voltage of a switching power supply will contain a saw tooth ripple voltage at the switcher frequency, typically about 1% of the output voltage, and may also contain short voltage spikes at the peaks of the saw tooth waveform. Due to the fast switching action, and the parasitic inductance of the output filter capacitor, there is voltage spikes presenting at the peaks of the saw tooth waveform. Cautions must be taken for stray capacitance, wiring inductance, and even the scope probes used for transients evaluation. To minimize these voltage spikes, shortening the lead length and PCB traces is always the first thought. Further more, an additional small LC filter (20µH & 100µF) (as shown in Figure 3) will possibly provide a 10X reduction in output ripple voltage and transients. Inductor Selection The AMC2576 can be used for either continuous or discontinuous modes of operation. Each mode has distinctively different operating characteristics, which can affect the regulator performance and requirements. With relatively heavy load currents, the circuit operates in the continuous mode (inductor current always flowing), but under light load conditions, the circuit will be forced to the discontinuous mode (inductor current falls to zero for a period of time). For light loads (less than approximately 300 mA) it may be desirable to operate the regulator in the discontinuous mode, primarily because of the lower inductor values required for the discontinuous mode. Inductors are available in different styles such as pot core, toroid, E-frame, bobbin core, et., as well as different core materials, such as ferrites and powdered iron. The least expensive, the bobbin core type, consists of wire wrapped on a ferrite rod core. This type of construction makes for an inexpensive inductor, but since the magnetic flux is not completely contained within the core, it generates more electromagnetic interference (EMI). This EMI can cause problems in sensitive circuits, or can give incorrect scope readings because of induced voltages in the scope probe. An inductor should not be operated beyond its maximum rated current because it may saturate. When an inductor begins to saturate, the inductance decreases rapidly and the inductor begins to look mainly resistive (the DC resistance of the winding). This will cause the switch current to rise very rapidly. Different inductor types have different saturation characteristics, and this should be well considered when selecting as inductor. COUT 1000 µF AMC2576-ADJ OUTPUT L1 100 µH 5 2 4 VIN VOUT FB GND CIN 100 µF 7V – 40V DC INPUT R2 50K R1 1.21K 3 ENABLE Figure 3. LC Filter for Low Output Ripple 1 L2 20 µH C1 100 µF |
Аналогичный номер детали - AMC2576-ADJDDF |
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Аналогичное описание - AMC2576-ADJDDF |
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