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TPS61085DGKT Fiches technique(PDF) 11 Page - Texas Instruments |
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TPS61085DGKT Fiches technique(HTML) 11 Page - Texas Instruments |
11 / 23 page Setting the Output Voltage 2 18 70 Vref R k A m = » W 1 2 1 S V R R Vref æ ö = ´ - ç ÷ è ø (2) Compensation (COMP) IN S COMP 125 × V × V × Cout R = L × Iout_max S COMP COMP V × Cout C = 5 × Iout_max × R (3) Input Capacitor Selection TPS61085 www.ti.com ...................................................................................................................................................................................................... SLVS859 – JUNE 2008 The output voltage is set by an external resistor divider. Typically, a minimum current of 50 µA flowing through the feedback divider gives good accuracy and noise covering. A standard low side resistor of 18 k Ω is typically selected. The resistors are then calculated as: The regulator loop can be compensated by adjusting the external components connected to the COMP pin. The COMP pin is the output of the internal transconductance error amplifier. Standard values of RCOMP = 13 kΩ and CCOMP = 3.3 nF will work for the majority of the applications. Please refer to Table 3 for dedicated compensation networks giving an improved load transient response. The following equations can be used to calculate RCOMP and CCOMP: Table 3. Recommended Compensation Network Values at High/Low Frequency FREQUENCY L VS VIN ± 20% RCOMP CCOMP 5 V 82 k Ω 1.1 nF 15 V 3.3 V 75 k Ω 1.6 nF 5 V 51 k Ω 1.1 nF High (1.2 MHz) 3.3 µH 12 V 3.3 V 47 k Ω 1.6 nF 5 V 30 k Ω 1.1 nF 9 V 3.3 V 27 k Ω 1.6 nF 5 V 43 k Ω 2.2 nF 15 V 3.3 V 39 k Ω 3.3 nF 5 V 27 k Ω 2.2 nF Low (650 kHz) 6.8 µH 12 V 3.3 V 24 k Ω 3.3 nF 5 V 15 k Ω 2.2 nF 9 V 3.3 V 13 k Ω 3.3 nF Table 3 gives conservatives Rcomp and Comp values for certain inductors, input and output voltages providing a very stable system. For a faster response time, a higher Rcomp value can be used to enlarge the bandwidth, as well as a slightly lower value of Ccomp to keep enough phase margin. These adjustments should be performed in parallel with the load transient response monitoring of TPS61085. For good input voltage filtering low ESR ceramic capacitors are recommended. TPS61085 has an analog input IN. Therefore, a 1 µF bypass is highly recommended as close as possible to the IC from IN to GND. One 10 µF ceramic input capacitors are sufficient for most of the applications. For better input voltage filtering this value can be increased. Refer to Table 4 and typical applications for input capacitor recommendations. Copyright © 2008, Texas Instruments Incorporated Submit Documentation Feedback 11 Product Folder Link(s): TPS61085 |
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