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SPX2810U Datasheet(PDF) 6 Page - Sipex Corporation |
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SPX2810U Datasheet(HTML) 6 Page - Sipex Corporation |
6 / 9 page 6 Date: 5/25/04 SPX2810 1A Low Dropout Linear Regulator © Copyright 2004 Sipex Corporation Figure 11. 12.5V Regulator with Shutdown Figure 10. Improving Ripple Rejection Figure 12. Recommended Connections for Best Results Output Voltage The output of the adjustable regulator can be set to any voltage between 1.25V and 10V. The value of V OUT can be quickly approximated using the formula (Figure 9) V OUT=1.25 *(R1 + R2)/R1. A small correction to this formula is required depending on the values of resistors R1 and R2, since adjustable pin current (approx 50 µA) flows through R2. When I ADJ is taken into account, the formula becomes V OUT = VREF(1+ (R2/R1)) + IADJ * R2, where VREF=1.25V. Layout Considerations Parasitic line resistance can degrade load regulation. In order not to affect the behavior of the regulator, it is best to connect R 1 to the case as illustrated in Figure 11. For the same reason, R2 should be connected to the negative side of the load. SPX2810 V IN R 2 R 1 Connect R 2 to Load R L Connect R1 to Case of Regulator RP Parasitic Line Resistance V OUT ADJ SPX2810 V IN 10µF 1k Ω 1% 330Ω 1% + + 4.7µF 5V ADJ IN OUT (Note A) 1k 1k TTL Input 2N3904 DROPOUT (MAX) Note A: V IN(MIN) = (Intended V OUT ) + (V ) SPX2810 V IN R 1 R 2 10µF 10µF* 1kΩ, 330Ω 1% + + 4.7µF C 1 *C 1 improves ripple rejection. Z C should be ~ R1 at ripple frequency 5V ADJ IN OUT (Note A) V OUT Note A: V IN(MIN) = (Intended VOUT ) + (V DROPOUT (MAX)) 1% |
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