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LT1585A-3.3 Datasheet(PDF) 8 Page - Linear Technology |
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LT1585A-3.3 Datasheet(HTML) 8 Page - Linear Technology |
8 / 12 page 8 LT1585A/LT1585A-3.3 1585afa APPLICATIONS INFORMATION load regulation is obtained when the top of resistor divider R1 connects directly to the regulator output and not to the load. Figure 5 illustrates this point. If R1 connects to the load, the effective resistance between the regulator and the load is: RP(1 + R2/R1), RP = Parasitic Line Resistance The connection shown in Figure 5 does not multiply RP by the divider ratio. As an example, RPisaboutfourmilliohms per foot with 16-gauge wire. This translates to 4mV per foot at 1A load current. At higher load currents, this drop represents a significant percentage of the overall regula- tion. It is important to keep the positive lead between the regulator and the load as short as possible and to use large wire or PC board traces. Load Regulation It is not possible to provide true remote load sensing because the LT1585A/LT1585A-3.3 are 3-terminal de- vices. Load regulation is limited by the resistance of the wire connecting the regulators to the load. Load regula- tion per the data sheet specification is measured at the bottom of the package. For fixed voltage devices, negative side sensing is a true Kelvin connection with the ground pin of the device returned to the negative side of the load. This is illustrated in Figure 4. For adjustable voltage devices, negative side sensing is a true Kelvin connection with the bottom of the output divider returned to the negative side of the load. The best LT1585A-3.3 RP PARASITIC LINE RESISTANCE GND VIN RL IN OUT LT1585A • F04 Figure 4. Connection for Best Load Regulation LT1585A OUT IN VIN ADJ RP PARASITIC LINE RESISTANCE R1* *CONNECT R1 TO CASE CONNECT R2 TO LOAD LT1585A • F05 RL R2* Figure 5. Connection for Best Load Regulation |
Similar Part No. - LT1585A-3.3_15 |
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Similar Description - LT1585A-3.3_15 |
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