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LM3411AM5-3.3 Scheda tecnica(PDF) 10 Page - National Semiconductor (TI) |
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LM3411AM5-3.3 Scheda tecnica(HTML) 10 Page - National Semiconductor (TI) |
10 / 13 page Applications Information (Continued) The circuit in Figure 8 shows a 3.3V low dropout regulator using the LM3411-3.3 and several discrete components. This circuit is capable of excellent performance with both the dropout voltage and the ground pin current specifications im- proved over the LM2941/LM3411 circuit. The standard LM317 three terminal adjustable regulator cir- cuit can greatly benefit by adding a LM3411. Performance is increased and features are added. The circuit shown in Fig- ure 9 provides much improved line and load regulation, lower temperature drift, and full remote output voltage sens- ing on both the high and low side. In addition, a precise cur- rent limit or constant current feature is simple to add. Current limit protection in most IC regulators is mainly to pro- tect the IC from gross over-current conditions which could otherwise fuse bonding wires or blow IC metalization, there- fore not much precision is needed for the actual current limit values. Current limit tolerances can sometimes vary from ±10% to as high as +300% over manufacturing and tem- perature variations. Often critical circuitry requires a much tighter control over the amount of current the power supply can deliver. For example, a power supply may be needed that can deliver 100% of its design current, but can still limit the maximum current to 110% to protect critical circuitry from high current fault conditions. The circuit in Figure 9 can provide a current limit accuracy that is better than ±4%, over all possible variations, in addi- tion to having excellent line, load and temperature specifications. Like the positive regulators, the performance of negative ad- justable regulators can also be improved by adding the LM3411. Output voltages of either 3.3V or 5V at currents up to 1.5A (3A when using a LM333) are possible. Adding two resistors to the circuit in Figure 10 adds the precision current limit feature as shown in Figure 11. Current limit tolerances of ±4% over manufacturing and temperature variations are possible with this circuit. DS011987-19 FIGURE 7. Precision 5V 1A Low Dropout Regulator DS011987-20 FIGURE 8. 3.3V 0.5A Low Dropout Regulator DS011987-21 FIGURE 9. Precision Positive Voltage Regulator with Accurate Current Limit www.national.com 10 |
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