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LM138K Scheda tecnica(PDF) 7 Page - Linear Technology |
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LM138K Scheda tecnica(HTML) 7 Page - Linear Technology |
7 / 12 page 7 LT138A/LT338A LM138/LM338 138afb APPLICATIONS INFORMATION negative side of the load. Although it may not be immedi- ately obvious, best load regulation is obtained when the top of the resistor divider, R1, is connected directly to the case not to the load. This is illustrated in Figure 3. If R1 were connected to the load, the effective resistance be- tween the regulator and the load would be: R RR R R Parasitic Line sis ce PP 21 1 + = , Re tan Connected as shown, RP is not multiplied by the divider ratio. RP is about 0.004Ω per foot using 16 gauge wire. This translates to 4mV/ft at 1A load current, so it is important to keep the positive lead between regulator and load as short as possible, and use large wire or PC board traces. LT338A RP PARASITIC LINE RESISTANCE VIN R1 CONNECT R1 TO CASE CONNECT R2 TO LOAD 138A/338A F03 VOUT ADJ VIN RL R2 Figure 3. Connections for Best Load Regulation TYPICAL APPLICATIONS Improving Ripple Rejection LT338A VIN R1 121 Ω 1% R2 365 Ω 1% 1 µF *C1 IMPROVES RIPPLE REJECTION, XC SHOULD BE SMALL COMPARED TO R2 CL* 10 µF 138A/338A TA03 VOUT ADJ 5V VIN + + 1.2V to 25V Adjustable Regulator LT338A VIN R1 240 Ω C1* 1 µF NEEDED IF DEVICE IS FAR FROM FILTER CAPACITORS OPTIONAL, IMPROVES TRANSIENT RESPONSE R2 5k 138A/338A TA04 VOUT ADJ VOUT † VIN + C2** 1 µF * ** + †VOUT = 1.25V R2 R1 1 + () |
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