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LM317LZRA Datasheet(PDF) 9 Page - ON Semiconductor |
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LM317LZRA Datasheet(HTML) 9 Page - ON Semiconductor |
9 / 12 page LM317L http://onsemi.com 9 Protection Diodes When external capacitors are used with any IC regulator it is sometimes necessary to add protection diodes to prevent the capacitors from discharging through low current points into the regulator. Figure 14 shows the LM317L with the recommended protection diodes for output voltages in excess of 25 V or high capacitance values (CO > 10 mF, CAdj > 5.0 mF). Diode D1 prevents CO from discharging thru the IC during an input short circuit. Diode D2 protects against capacitor CAdj discharging through the IC during an output short circuit. The combination of diodes D1 and D2 prevents CAdj from discharging through the IC during an input short circuit. D1 Vin Cin 1N4002 LM317L Vout R1 + CO D2 R2 CAdj 1N4002 Adjust Figure 18. Voltage Regulator with Protection Diodes Figure 19. Adjustable Current Limiter Figure 20. 5.0 V Electronic Shutdown Regulator Figure 21. Slow Turn−On Regulator Figure 22. Current Regulator Vref +25V Vin LM317L 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 < 100 mA − IP As shown O < IO < 95 mA + 10 mF Vin Vout 240 1N4002 LM317L Adjust MPS2907 R2 50k Vin D1 1N4002 Vout 120 Adjust 720 + 1.0 mF MPS2222 1.0k TTL Control LM317L Minimum Vout = 1.25 V D1 protects the device during an input short circuit. LM317L Vin R1 R2 Adjust IAdj Iout Ioutmax = Vref + IAdj ^ 5.0 mA < Iout < 100 mA Vout 1.25 V Ioutmax = Vref + IAdj ^ 1.25 V IDSS IOmax + IDSS R1 R1 + R2 R1 R1 + R2 |
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