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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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ADP1874ARQZ-0.3-R7 датащи(PDF) 26 Page - Analog Devices |
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ADP1874ARQZ-0.3-R7 датащи(HTML) 26 Page - Analog Devices |
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26 / 44 page  ADP1874/ADP1875 Rev. 0 | Page 26 of 44 The slave output tracks the master output dv/dt until the slave output regulation point is reached. Any influence by the master voltage thereafter will no longer be in effect. Ensure that the voltage forced on the slave TRACK pin is above 0.7 V at the end of TRACK phase. Voltages imposed on the TRACK pin below 0.7 V, once that tracking period has expired (steady state), may result in regulation inaccuracies due to the internal offsets of the error amplifier between TRACK and FB. Ratiometric tracking can be achieved by assigning the slave output to rise more quickly than the master voltage. The simplest way to perform ratiometric tracking is to differentially connect the slave TRACK pin to the FB pin of the master voltage IC. The slave output, however, must be limited to a fraction of the master voltage. In this tracking configuration, it is not recommended for the slave TRACK pin to terminate at a voltage lower than 0.6 V due to inaccuracies between the TRACK and FB inputs previously mentioned. It is not recommended to force any voltage on the slave TRACK pin lower than 0.6 V. Figure 84 illustrates a circuit with a ratiometric tracking configuration. Setting RTRK1 > RTRK2 ensures that the slave TRACK voltage will rise up more quickly (to the regulation point) than the master voltage. MASTER VOLTAGE SLAVE VOLTAGE TIME (ms) Figure 84. Ratiometric Tracking: Master Voltage—Slave Voltage Tracking Relationship |
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