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LM4801MH Datasheet(PDF) 11 Page - National Semiconductor (TI) |
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LM4801MH Datasheet(HTML) 11 Page - National Semiconductor (TI) |
11 / 20 page LDO Typical Performance Characteristics Unless otherwise specified, V IN =VOUT + 0.5V, CIN = COUT = 2.2µF, CCC = 33nF, TJ = 25˚C, VSHDN =VIN. (Continued) Power-Up Response Power-Down Response 200736B4 200736B5 External Components Description (Refer to Figure 1.) Components Functional Description 1. R i The Inverting input resistance, along with R f, set the closed-loop gain. Ri, along with Ci, form a high pass filter with f c = 1/(2 πR iCi). 2. C i The input coupling capacitor blocks DC voltage at the amplifier’s input terminals. C i, along with Ri, create a highpass filter with f c = 1/(2 πR iCi). Refer to the section, SELECTING PROPER EXTERNAL COMPONENTS, for an explanation of determining the value of C i. 3. R f The feedback resistance, along with R i, set the closed-loop gain. 4. C s The supply bypass capacitor. Refer to the POWER SUPPLY BYPASSING section for information about properly placing, and selecting the value of, this capacitor. 5. C B The capacitor, C B, filters the half-supply voltage present on the BYPASS pin. Refer to the SELECTING PROPER EXTERNAL COMPONENTS section for information concerning proper placement and selecting C B’s value. 6. R 1 Combined with R 2, sets the LDO’s output voltage according to the following equation: R 1 =R2 ((VOUT / 1.25V) -1) 7. R 2 Combined with R 1, sets the LDO’s output voltage according to the following equation: R 2 = (1.25V x R1)/(VOUT - 1.25V) www.national.com 11 |
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