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ISL6529ACRZ Datasheet(PDF) 13 Page - Renesas Technology Corp |
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ISL6529ACRZ Datasheet(HTML) 13 Page - Renesas Technology Corp |
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13 / 20 page  ISL6529, ISL6529A FN9070 Rev 5.00 Page 13 of 20 Apr 12, 2005 frequencies and high load current. Figure 13 shows the results of the complete system with output capacitor and compensation network for 45° of phase margin. Because of the large variety of capacitors, varying ESRs and PC board layouts, Table 1, based upon system simulations is provided as a starting point guide to aid in the selection of compensation networks for output capacitors values of 1 F, 10 F, 100F and 1000F with ESR values of 5m, 30m and 100m for each capacitor value. The frequencies associated with the compensation elements are also shown to aid in component selection. Parallel capacitors of the same value and type can be treated as a combination. For example three 100 F, 10m capacitors may be treated as one 300 F, 3.3m capacitor. Mixed capacitors require more attention. For example the compensation for a 1000 F, low ESR capacitor will suffice for a shunting 10 F, low ESR capacitor. TABLE 1. COMPENSATION NETWORKS FOR LINEAR REGULATOR CAP ESR DETAIL OUTPUT CAPACITOR 1 F10F 100 F 1000 F 5m Comp Network C16 = 10pF R12 = 47K C4 = 200pF C16 = 10pF R12 = 47K C4 = 470pF C16 = 10pF R12 = 200K C4 = 470pF C16 = 10pF R12 = 470K C4 = 470pF Low Fq Zero (C4 & R12) 17kHz 7.2kHz 1.7kHz 720Hz High Fq Pole (C16 & R12) 338kHz 338kHz 80kHz 34kHz MidbandGain R12/R5 20dB 20dB 33dB 40dB OUTPUT CAP & ESR Zero Fq 32MHz 3.2MHz 320kHz 32kHz 30m Comp Network C16 = 10pF R12 = 47K C4 = 200pF C16 = 10pF R12 = 47K C4 = 470pF C16 = 10pF R12 = 200K C4 = 470pF C16 = 10pF Low Fq Zero (C4 & R12) 17kHz 17kHz 1.7kHz - High Fq Pole (C16 & R12) 338kHz 338kHz 80kHz - Midband Gain R12/R5 20dB 20dB 33dB - OUTPUT Cap & ESR Zero Fq 5.3MHz 530kHz 53kHz 5.3kHz 100m Comp Network C16 = 10pF R12 = 47K C4 = 200pF C16 = 10pF R12 = 47K C4 = 470pF C16 = 10pF C16= 10pF Low Fq Zero (C4 & R12) 17kHz 17kHz - - High Fq Pole (C16 & R12) 338kHz 338kHz - - Midband Gain R12/R5 20dB 20dB - - OUTPUT Cap & ESR Zero Fq 1.6MHz 160kHz 16kHz 1.6kHz |
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