Adjusting Boost Converter Voltage

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Determining resistor values.

Fetching resistor data.

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Using BOM Tool.

Using Schematic Tool.

Using BOM Tool.

Looking for "Feedback voltage" in tps61085

Using Calculator Tool.

Identifying resistor selection intent.

Based on knowledge base guidance for designing feedback networks and the TPS61085 datasheet:
  • The TPS61085’s internal reference (V_FB) is 1.229 V (from the datasheet).
  • In our schematic, the lower feedback resistor (R2) is 18.2 kΩ.
  • The output voltage equation is:
    VOUT=VFB(1+R1R2)V_{OUT} = V_{FB}\Bigl(1 + \frac{R1}{R2}\Bigr)
    Rearranged for R1:
    R1=R2(VOUTVFB−1)R1 = R2\Bigl(\frac{V_{OUT}}{V_{FB}} - 1\Bigr)
  • Plugging in V_OUT = 8 V, V_FB = 1.229 V, and R2 = 18.2 kΩ:
    R1=18.2 kΩ×(81.229−1)≈100 kΩR1 = 18.2\,\text{kΩ}\times\bigl(\tfrac{8}{1.229}-1\bigr)\approx 100\,\text{kΩ}
    (Calculator result: 1.0027×10^5 Ω)
Thus, choosing a standard 100 kΩ resistor for R1 ensures the booster regulates to 8 V.
126 days
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@library find a 100 kΩ 0603 resistor for R1
126 days

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Finding the right resistor.

Starting 1 component search

Dispatching Library tool to find: "100kΩ resistor 0603"

Creating search plan for: "100kΩ resistor 0603"

Searching: "Searching for a standard surface-mount resistor in a 0603 package used for general biasing or voltage divider applications. Initially, the focus is on the footprint and basic resistor function without filtering by resistance value."

Searching: "Looking for a surface-mount resistor with a nominal value of 100kΩ in an 0603 package, typical for signal conditioning or voltage divider use. The query targets standard low-power resistors that can be used in automated PCB assembly."

Searching: "Searching for a high-precision, low power resistor in an 0603 package with a nominal value of 100kΩ, 1% tolerance, and an approximate power rating of 0.1W. This part is needed for applications requiring tight resistance tolerances and reliability in compact circuits."

Found 60 results.

Searching: "100kΩ resistor 0603"

Completed 1 component search.

Querying the resistor.

Here are the top 3 matching 100 kΩ, 0603 resistors:

Table

Part NameManufacturerResistanceTolerancePower RatingPackageAvailabilityLinkDatasheet
CRCW0603100KFKEAVishay Dale100 kΩ±1%0.1 W0603Digi-Key, Mouser, Arrow, LCSCView in LibraryPDF
RMCF0603FG100KStackpole Electronics Inc100 kΩ±1%0.1 W0603Digi-Key, MouserView in LibraryPDF
RMCF0603FT100KStackpole Electronics Inc100 kΩ±1%0.1 W0603Digi-Key, Mouser, ArrowView in LibraryPDF
Recommendation: All three are 100 kΩ ±1% thick-film resistors in 0603 with 0.1 W rating. The Vishay CRCW0603100KFKEA has the highest usage count and broadest distributor support, making it a robust choice for R1.
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C3
Capacitance
1.1n F
C1
Capacitance
10u F
R2
Resistance
18.2k Ω
VIN
L1
Inductance
3.3u H
R3
Resistance
51k Ω
FB
D1
R1
Resistance
158k Ω
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TPS61085 Reference design tiHX

TPS61085 Reference design tiHX
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Last updated by mikekinyanjui6
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mikekinyanjui6

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