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NCP1583 Datasheet(PDF) 11 Page - ON Semiconductor |
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NCP1583 Datasheet(HTML) 11 Page - ON Semiconductor |
11 / 16 page NCP1582, NCP1582A, NCP1583 http://onsemi.com 11 Design Example Switching Frequency FSW = 350 KHZ Output Capacitance CESR = 45 mW/Each Output Capacitance Cout = 6630 mF Output Inductance Lout = 0.75 mH Input Voltage Vin = 12 V Output Voltage Vout = 3.3 V Choose the loop gain crossover frequency; FCO + 1 10 *FSW + 35 kHz The corner frequency of the output filter is calculated below; FLC + 1 2* p *0.75 mH * 6630 mF + 2.3 kHz Let RC = 1500 Check that the ESR zero frequency is not too high; FESR + 1 2* p @ CESR @ CO t FSW 5 This condition is mandatory for loop stability. Zero of the compensation network is calculated as follows; FZ + FLC CC + 1 2* p *FZ *RC + 1 2* p * 2.3 kHz * 1500 + 46 nF The compensation capacitor also acts as the soft start capacitor. By adjusting the value of this compensation capacitor, the soft start time can be adjusted. Pole of the compensation network is calculated as follows; FP + 5* FCO + 175 kHz CP + 1 2* p *FP *RC + 1 2* p * 175 kHz * 1500 + 700 pF The recommended compensation values are; RC = 1500, CC = 46 nF, CP = 700 pF The NCP158x bode plot as measured from the network analyzer is shown below. Figure 15. Typical Bode plot of the Open−loop Frequency Response of the NCP158x Top plot: Phase−Frequency (Phase Margin = 62.519 °) Bottom plot: Gain−Frequency (UGBW= 5 MHz) |
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