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LM7805 Datasheet(PDF) 22 Page - Fairchild Semiconductor |
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LM7805 Datasheet(HTML) 22 Page - Fairchild Semiconductor |
22 / 28 page ![]() MC78XX/LM78XX/MC78XXA 22 Figure 9. Constant Current Regulator Notes: (1) To specify an output voltage. substitute voltage value for "XX." A common ground is required between the input and the Output voltage. The input voltage must remain typically 2.0V above the output voltage even during the low point on the input ripple voltage. (2) CI is required if regulator is located an appreciable distance from power Supply filter. (3) CO improves stability and transient response. VO = VXX(1+R2/R1)+IQR2 Figure 10. Circuit for Increasing Output Voltage IRI ≥5 IQ VO = VXX(1+R2/R1)+IQR2 Figure 11. Adjustable Output Regulator (7 to 30V) Input Output MC78XX/LM78XX CI Co Input Output MC78XX/LM78XX CI Co I RI 5IQ ≥ Input Output MC7805 LM7805 LM741 Co CI |
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