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AIC2510PM5 Datasheet(PDF) 8 Page - Analog Intergrations Corporation |
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AIC2510PM5 Datasheet(HTML) 8 Page - Analog Intergrations Corporation |
8 / 11 page AIC2510 8 APPLICATION INFORMATION (Continued) Components Selection Inductor The inductor selection depends on the operating frequency of the AIC2510. The ripple current ∆IL interrelates with inductor value. A lower inductor value gets a higher ripple current. Besides, a higher VIN or VOUT can also get the same result. The inductor value can be calculated as the following formula. ( )( ) − ∆ = IN OUT OUT L V V 1 V I f 1 L Users can define the acceptable ∆IL to gain a suitable inductor value. Diode The diode current rating must be higher than 1.3 times maximum load current. Also, if the power supply needs to resist a continuous output short, the diode should have a current ration equal to the maximum current limit of the AIC2510. The reverse voltage rating of the diode should be higher than 1.25 times input voltage and the diode must be fast. The reverse recovery time of the diode is short. Capacitor The selection of output capacitor depends on the suitable ripple voltage. Lower ripple voltage corresponds to lower ESR (Equivalent Series Resistor) of output capacitor. Typically, once the ESR is satisfied with the ripple voltage, the value of capacitor is adequate for filtering. The formula of ripple voltage is as below: + ∆ = ∆ OUT L OUT fC 8 1 ESR I V The typical input capacitor is 470uF. But as the temperature decreases, the input capacitor needs to increase to stabilize the circuit. Example Assume the input voltage is 12V, output voltage is 5V and maximum load current is 3A. The output ripple must be smaller than 2% of output voltage Inductor selection: ( )( ) − ∆ = IN OUT OUT L V V V I f L 1 1 uH k 4 . 32 12 5 1 5 6 . 0 150 1 = − × × × = Here, the delta IL is 0.6A. So we choose 33uH inductor. Output capacitor selection: mV fC ESR I V OUT L OUT 100 8 1 < + ∆ = ∆ We choice the capacitor value: ESR=0.12, capacitance=220uF mV mV fC ESR I V OUT L OUT 100 74 8 1 < = + ∆ = ∆ ⇒ Diode selection: The full load is 3A and delta IL is 0.6A, so the diode current rating must be higher than 3.6A. CF Capacitor for adj version As using the AIC2510 adj version, the CF capacitor is required to provide additional stability. In different condition, the CF capacitor must be changed to make the circuit stable. Output Voltage (V) Input Voltage (V) R1 ( Ω) R2 ( Ω) CF (pF) 1.8 7 36k 82k 1000 4 12 180k 82k 360 6 12 180k 47k 360 8 15 180k 33k 360 10 18 150k 22k 470 15 25 110k 10k 560 Table 1 |
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