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LM2575IKTGR 데이터시트(PDF) 7 Page - Texas Instruments |
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LM2575IKTGR 데이터시트(HTML) 7 Page - Texas Instruments |
7 / 12 page www.ti.com APPLICATION INFORMATION Layout Guidelines LM2575-xx Fixed Output CIN 100 µF + +VIN 1 3 GND 5 D1 2 L1 330 µH COUT 330 µF + 4 L O A D VOUT VIN Unregulated DC Input CIN = 100 µF, Aluminum Electrolytic COUT = 330 µF, Aluminum Electrolytic D1 = Schottky L1 = 330 µH Fixed Output Voltage Versions LM2575 (ADJ) CIN 100 µF + +VIN 1 3 GND 5 ON/OFF D1 11DQ06 OUTPUT 2 L1 330 µH COUT 330 µF + FEEDBACK 4 L O A D VOUT 7-V to 60-V Unregulated DC Input Adjustable Output Voltage Versions VOUT = VREF(1 + R2/R1) = 5 V Where, VREF = 1.23 V R1 = 2 kW R2 = 6.12 kW R2 R1 ON/OFF OUTPUT FEEDBACK LM2575 1-A SIMPLE STEP-DOWN SWITCHING VOLTAGE REGULATOR SLVS569D – JANUARY 2005 – REVISED JULY 2005 With any switching regulator, circuit layout plays an important role in circuit performance. Wiring and parasitic inductances, as well as stray capacitances, are subjected to rapidly switching currents, which can result in unwanted voltage transients. To minimize inductance and ground loops, the length of the leads indicated by heavy lines should be minimized. Optimal results can be achieved by single-point grounding (see Figure 2) or by ground-plane construction. For the same reasons, the two programming resistors used in the adjustable version should be located as close as possible to the regulator to keep the sensitive feedback wiring short. A. Pin numbers are for the KTT (TO-263) package. Figure 2. Test Circuit and Layout Guidelines 7 |
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