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LM2575INE4 Datasheet(PDF) 5 Page - Texas Instruments |
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LM2575INE4 Datasheet(HTML) 5 Page - Texas Instruments |
5 / 10 page www.ti.com APPLICATION INFORMATION Layout Guidelines LM2575 (ADJ) CIN 100 µF + +VIN 16 5, 12, 13 GND 9 ON/OFF D1 11DQ06 OUTPUT 3 L1 330 µH COUT 330 µF + FEEDBACK 7 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 Input Capacitor (C IN) I C,RMS u 1.2( ton T ) I LOAD, where: ton T + V OUT V IN {buck regulator}, and ton T + |V OUT| (|V OUT| ) VIN) {buck−boost regulator} Output Capacitor (C OUT) LM2575 1-A SIMPLE STEP-DOWN SWITCHING VOLTAGE REGULATOR SLVS569E – JANUARY 2005 – REVISED JANUARY 2006 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 (see Figure 1) should be minimized. Optimal results can be achieved by single-point grounding 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. Figure 1. Test Circuit and Layout Guidelines For stability concerns, an input bypass capacitor (electrolytic, CIN ≥ 47 µF) needs to be located as close as possible to the regulator. For operating temperatures below –25 °C, C IN may need to be larger in value. In addition, since most electrolytic capacitors have decreasing capacitances and increasing ESR as temperature drops, adding a ceramic or solid tantalum capacitor in parallel increases the stability in cold temperatures. To extend the capacitor operating lifetime, the capacitor RMS ripple current rating should be: For both loop stability and filtering of ripple voltage, an output capacitor also is required, again in close proximity to the regulator. For best performance, low-ESR aluminum electrolytics are recommended, although standard aluminum electrolytics may be adequate for some applications. Based on the following equation: Output Ripple Voltage = (ESR of COUT) × (inductor ripple current) 5 |
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