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LM317MDT Datasheet(PDF) 11 Page - ON Semiconductor |
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LM317MDT Datasheet(HTML) 11 Page - ON Semiconductor |
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11 / 16 page  LM317M http://onsemi.com 11 Figure 21. Adjustable Current Limiter Figure 22. 5 V Electronic Shutdown Regulator Figure 23. Slow Turn−On Regulator Figure 24. Current Regulator Vref +25V Vin LM317M Vout R1 VO 1.25k Adjust IO D2 1N914 1N5314 R2 500 * To provide current limiting of IO to the system ground, the source of the current limiting diode must be tied to a negative voltage below −7.25 V. R2 ≥ Vref R1 = VSS* D1 1N914 VO < POV + 1.25 V + VSS ILmin − IP < IO < 500 mA − IP As shown O < IO < 495 mA + 10 mF Vin Vout 240 1N4001 LM317M Adjust MPS2907 R2 50k Vin D1 1N4002 Vout 120 Adjust 720 + 1.0 mF MPS2222 1.0k TTL Control LM317M Minimum Vout = 1.25 V D1 protects the device during an input short circuit. LM317M Vin R1 R2 Adjust IAdj Iout 5.0 mA < Iout < 100 mA Vout Ioutmax = Vref + IAdj ^ 1.25 V R1 + R2 Vout Vout Vin IDSS IOmax + IDSS R1 + R2 40 50 60 70 80 90 100 0 0.4 0.8 1.2 1.6 2.0 2.4 010 20 30 25 15 5.0 L, LENGTH OF COPPER (mm) PD(max) for TA = 50°C Minimum Size Pad L L Free Air Mounted Vertically RqJA 2.0 oz. Copper Figure 25. DPAK Thermal Resistance and Maximum Power Dissipation versus PCB Copper Length Figure 26. SOT−223 Thermal Resistance and Maximum Power Dissipation versus PCB Copper Length 40 80 120 160 200 240 280 0.35 0.42 0.50 0.63 0.83 1.25 2.50 010 20 30 25 15 5.0 L, LENGTH OF COPPER (mm) PD(max) for TA = 50°C Minimum Size Pad L L Free Air Mounted Vertically RqJA 2.0 oz. Copper |
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Similar Description - LM317MDT |
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