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EA4533AYH Datasheet(PDF) 7 Page - Active-Semi, Inc |
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EA4533AYH Datasheet(HTML) 7 Page - Active-Semi, Inc |
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7 / 17 page  ACT4533A/B Rev 0, 14-Aug-13 Innovative Power TM - 7 - www.active-semi.com Copyright © 2013 Active-Semi, Inc. APPLICATIONS INFORMATION Output Voltage Setting Figure 1: Output Voltage Setting Figure 1 shows the connections for setting the output voltage. Select the proper ratio of the two feedback resistors RFB1 and RFB2 based on the output voltage. Adding a capacitor in parallel with RFB1 helps the system stability. Typically, use RFB2 ≈ 10kΩ and determine RFB1 from the following equation: CC Current Setting ACT4533A/B constant current value is set by a resistor connected between the ISET pin and GND. The CC output current is linearly proportional to the current flowing out of the ISET pin. The voltage at ISET is roughly 1.1V and the current gain from ISET to output is roughly 21000 (21mA/1µA). To determine the proper resistor for a desired current, please refer to Figure 2 below. Figure 2: Curve for Programming Output CC Current CC Current Line Compensation When operating at constant current mode, the current limit increase slightly with input voltage. For wide input voltage applications, a resistor RC may be added to compensate line change and keep output high CC accuracy, as shown in Figure 3. Figure 3: Iutput Line Compensation Inductor Selection The inductor maintains a continuous current to the output load. This inductor current has a ripple that is dependent on the inductance value: Higher inductance reduces the peak-to-peak ripple current. The trade off for high inductance value is the increase in inductor core size and series resistance, and the reduction in current handling capability. In general, select an inductance value L based on ripple current requirement: where VIN is the input voltage, VOUT is the output voltage, fSW is the switching frequency, ILOADMAX is the maximum load current, and KRIPPLE is the ripple factor. Typically, choose KRIPPLE = 30% to correspond to the peak-to-peak ripple current being 30% of the maximum load current. With a selected inductor value the peak-to-peak inductor current is estimated as: The peak inductor current is estimated as: The selected inductor should not saturate at ILPK. The maximum output current is calculated as: (3) ( ) SW IN OUT IN OUT PK LPK f V L V V V I × × × = _ _ PK LPK LOADMAX LPK _ I 2 1 I I + = (4) Output Current vs. RISET 3500 3000 2500 2000 1500 1000 500 4500 4000 RISET (kΩ) 2 6 10 14 18 22 26 (2) ( ) RIPPLE LOADMAX SW IN OUT IN OUT K I f V V V V L _ × = ⎟ ⎠ ⎞ ⎜ ⎝ ⎛ − = 1 V 808 . 0 V R R OUT 2 FB 1 FB (1) VIN = 24V, VOUT = 4V |
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