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LMR23630AFDDA Datasheet(PDF) 13 Page - Texas Instruments |
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LMR23630AFDDA Datasheet(HTML) 13 Page - Texas Instruments |
13 / 42 page ![]() OUT REF FBT FBB REF V V R R V u VOUT FB RFBT RFBB 0 50 100 150 200 250 0 500 1000 1500 2000 2500 Switching Frequency (kHz) C008 13 LMR23630 www.ti.com SNVSAH2C – DECEMBER 2015 – REVISED JUNE 2017 Product Folder Links: LMR23630 Submit Documentation Feedback Copyright © 2015–2017, Texas Instruments Incorporated Feature Description (continued) Figure 14. RT vs Frequency Curve Table 1. Typical Frequency Setting RT Resistance fSW (kHz) RT (kΩ) 200 200 350 115 500 78.7 750 53.6 1000 39.2 1500 26.1 2000 19.6 2200 17.8 8.3.3 Adjustable Output Voltage A precision 1-V reference voltage is used to maintain a tightly regulated output voltage over the entire operating temperature range. The output voltage is set by a resistor divider from output voltage to the FB pin. TI recommends using 1% tolerance resistors with a low temperature coefficient for the FB divider. Select the lowside resistor RFBB for the desired divider current and use Equation 2 to calculate high-side RFBT. RFBT in the range from 10 k Ω to 100 kΩ is recommended for most applications. A lower RFBT value can be used if static loading is desired to reduce VOUT offset in PFM operation. Lower RFBT will reduce efficiency at very light load. Less static current goes through a larger RFBT and might be more desirable when light load efficiency is critical. However, RFBT larger than 1 MΩ is not recommended because it makes the feedback path more susceptible to noise. Larger RFBT value requires more carefully designed feedback path on the PCB. The tolerance and temperature variation of the resistor dividers affect the output voltage regulation. Figure 15. Output Voltage Setting (2) |
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