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LP38852-ADJ Datasheet(PDF) 13 Page - Texas Instruments |
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LP38852-ADJ Datasheet(HTML) 13 Page - Texas Instruments |
13 / 33 page + R2 R1 1 x = V V ADJ OUT ¸ ¹ · ¨ © § ¸ © § ¨ ¨ ¹ · LP38852-ADJ www.ti.com SNVS482F – JANUARY 2007 – REVISED DECEMBER 2015 Feature Description (continued) Figure 22. Typical CSS vs COUT Values The CSS capacitor must be connected to a clean ground path back to the device ground pin. No components, other than CSS, should be connected to the SS pin, as there could be adverse effects to VOUT. If the soft-start function is not needed the SS pin must be left open, although some minimal capacitance value is always recommended. 7.3.5 Setting The Output Voltage The output voltage is set using the external resistive divider R1 and R2. (Refer to the Figure 23.) The output voltage is given by Equation 2: (2) The resistors used for R1 and R2 must be high quality, tight tolerance, and with matching temperature coefficients. It is important to remember that, although the value of VADJ is specified, the use of low quality resistors for R1 and R2 can easily produce a VOUT value that is unacceptable. It is recommended that the values selected for R1 and R2 are such that the parallel value is less than 10 k Ω. This is to prevent internal parasitic capacitances on the ADJ pin from interfering with the FZ pole set by R1 and CFF. ((R1 x R2) / (R1 + R2)) ≤ 10 kΩ (3) Table 1 lists some suggested, best fit, standard ±1% resistor values for R1 and R2, and a standard ±10% capacitor values for CFF, for a range of VOUT values. Other values of R1, R2, and CFF are available that give similar results. Copyright © 2007–2015, Texas Instruments Incorporated Submit Documentation Feedback 13 Product Folder Links: LP38852-ADJ |
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