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ACT4501SH-T Datasheet(PDF) 9 Page - Active-Semi, Inc |
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ACT4501SH-T Datasheet(HTML) 9 Page - Active-Semi, Inc |
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9 / 16 page  ACT4501 Rev 2, 14-Nov-12 Innovative Power TM - 9 - www.active-semi.com Copyright © 2012 Active-Semi, Inc. STABILITY COMPENSATION CONT’D feedback resistance values for cable compensation. RFB1 is the high side resistor of voltage divider. In the case of high RFB1 used, the frequency compensation needs to be adjusted correspondingly. As show in Figure 6, adding a capacitor in paralled with RFB1 or increasing the compensation capacitance at COMP pin helps the system stability. Figure 5: Cable Compensation at Various Resistor Divider Values Figure 6: Frequency Compensation for High RFB1 PC Board Layout Guidance When laying out the printed circuit board, the following checklist should be used to ensure proper operation of the IC. 1) Arrange the power components to reduce the AC loop size consisting of CIN, IN pin, SW pin and the schottky diode. 2) Place input decoupling ceramic capacitor CIN as close to IN pin as possible. CIN is connected power GND with vias or short and wide path. 3) Return FB, COMP and ISET to signal GND pin, and connect the signal GND to power GND at a single point for best noise immunity. 4) Use copper plane for power GND for best heat dissipation and noise immunity. 5) Place feedback resistor close to FB pin. 6) Use short trace connecting HSB-CHSB-SW loop Figure 7 shows an example of PCB layout. Figure 8 gives one typical car charger application schematics and associated BOM list. Figure 7: PCB Layout 0.3 0.25 0.2 0.15 0.1 0.05 0 Output Current (mA) 0 200 400 600 800 1000 Delta Output Voltage vs. Output Current VIN = 12V V0UT = 5V RF B1 = 3 00 k RFB 1 = 2 70k RFB 1 = 240 k RFB 1 = 200 k RFB1 = 15 0k RFB1 = 100k RFB1 = 51 k |
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