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SPI-8010A датащи(PDF) 5 Page - Allegro MicroSystems |
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SPI-8010A датащи(HTML) 5 Page - Allegro MicroSystems |
5 / 9 page SPI-8010A 3 A, DC/DC Step-Down Converter www.allegromicro.com Switching Regulators 5 APPLICATIONS INFORMATION Input Capacitor (C1 and C7). Capacitors with low impedance for high-frequency ripple current must be used. Output Capacitor (C2 and C8). Capacitors with low impedance for high-frequency ripple current must be used. Especially when the C2 impedance is high, the switching waveform may not be normal at low temperatures. Film or tantalum capacitors for C2 may cause abnormal oscilla- tions. Catch Diode (D1). Diode D1 must be a Schottky diode. Other diode types will result in increased forward voltage spikes, reverse current flow, increased IC power dissipa- tion during the off period, and possible destruction of the IC. Choke Coil (L1). If the winding resistance of the choke coil is too high, the circuit efficiency will decrease. As the overcurrent protection start current is approximately 4.5 A, attention must be paid to the heating of the coil by magnetic saturation due to overload. To reduce the output ripple, the inductor may be increased at the expense of excessive board area and cost. Output Voltage Adjustable Resistors (R2 and R3). The output voltage is adjusted by R2 and R3. 500 Ω for R3 is recommended. R2 = (V O – Vref)/(Vref/R3) C1 220 µF/63 V C2 470 µF/25 V C3 0.1 µF C4 1000 pF C5 0.1 µF C6 0.047 µF C7 0.1 µF C8 0.1 µF C9 6800 pF R1 47 Ω L1 47 µH D1 Sanken SPB-G56S Determination of DC Input Voltage. The minimum value of dc input voltage is 8 V when the output is less than 5 V, VO + 3 V when the output voltage is more than 5 V. The recommended maximum value is 50 V when the output value is more than 2.5 V, derated linearly to 30 V when the output is 1 V. Typical Application |
Аналогичный номер детали - SPI-8010A |
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Аналогичное описание - SPI-8010A |
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