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ML4771ES Datasheet(PDF) 6 Page - Micro Linear Corporation |
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ML4771ES Datasheet(HTML) 6 Page - Micro Linear Corporation |
6 / 8 page 6 ML4771 Figure 7. Sample PC Board Layout OUTPUT CAPACITOR The output capacitor filters the pulses of current from the switching regulator. Since the switching frequency will vary with inductance, the minimum output capacitance required to reduce the output ripple to an acceptable level will be a function of the inductor used. Therefore, to maintain an output voltage with less than 100mV of ripple at full load current, use the following equation: C L V OUT OUT = 44 (2) The output capacitor’s Equivalent Series Resistance (ESR) and Equivalent Series Inductance (ESL), also contribute to the ripple. Just after the NMOS transistor, Q1, turns off, the current in the output capacitor ramps quickly to between 0.5A and 1.5A. This fast change in current through the capacitor’s ESL causes a high frequency (5ns) spike to appear on the output. After the ESL spike settles, the output still has a ripple component equal to the inductor discharge current times the ESR. To minimize these effects, choose an output capacitor with less than 10nH of ESL and 100m W of ESR. Suitable tantalum capacitors can be obtained from the following vendors: AVX (207) 282-5111 Kemet (846) 963-6300 Sprague (207) 324-4140 DESIGN CONSIDERATIONS (Continued) Figure 5. Efficiency vs. IOUT Using the Circuit of Figure 8 Figure 4. IOUT vs. VIN Using the Circuit of Figure 8 Figure 6. No Load Input Current vs. VIN 1000 800 600 400 200 0 VIN (V) 1.5 2.5 3.5 5.5 4.5 VOUT = 3.0V VOUT = 5.5V 90 80 70 60 IOUT (mA) 1 10 100 1000 VOUT = 3.0V VOUT = 5.5V VIN = 2.4V 160 120 80 40 0 VIN (V) 1.5 2.5 3.5 5.5 4.5 VOUT = 3.0V VOUT = 5.5V |
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