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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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IP1206PBF датащи(PDF) 14 Page - International Rectifier |
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IP1206PBF датащи(HTML) 14 Page - International Rectifier |
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14 / 30 page  2/26/2008 www.irf.com 14 iP1206PbF Fig. 13: Ratiometric Power up /down Output Voltage Tracking and Sequencing The iP1206 can accommodate a full spectrum of user programmable tracking and sequencing options using Track, Seq, Enable and Power Good pins. Through these pins both simple voltage tracking such as that required by the DDR memory application and more sophisticated sequencing such ratiometric or simultaneously can be implemented. The Seq pin controls the internal current sources to set the power up or down sequencing, toggle this pin high for power up and toggle this pin low for power down. The Track pin is used to determine the second channel output for either ratiometric or simultaneously by using two external resistors. Fig. 12 shows how these pins are configured for different sequencing mode. E/A1 VP1 Fb1 SS1/SD1 ISS1 = 28uA POR OCP1 Ihiccup1 = 3uA 64uA 3V Seq VREF Vo1 RA RB CSS1 Fig.12: Using Seq and Track pin for different sequencing In general the R A and RB set the output voltage for the first output and R C and RD set the output voltage for the second output. For simultaneously vs. ratiometric, RE and RF can be selected according to the table below: Fig. 14: Simultaneously Power Up / down E/A2 VP2 Fb2 SS2/SD2 ISS2 = 28uA Track POR OCP2 Ihiccup2 = 3uA 64uA 3V Floating Vo2 Vo1 RC RD RE RF VREF And R F = RB And R F = RD Set R E = RA Set R E = RC ratiometric simultaneously |
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