Buck Boost Converter Discussion

flux

1:23

Thought for 2s

Search [[object Object]](https://www.flux.ai/search?q=%5Bobject%20Object%5D&type=components).

Search complete.

Running calculation.

Set the switching frequency on TPS552892RYQR by the FSW pin resistor:
  • Datasheet (Pin Functions, Table 5-1): the FSW pin switching frequency is programmed by a resistor between FSW and AGND.
  • Datasheet frequency equation (Eq. 3 / Section “Switching Frequency”):
    fSW=10000.05×RFSW+35 (MHz)f_{SW} = \frac{1000}{0.05 \times R_{FSW} + 35}\ \text{(MHz)}
For ~500 kHz target
Using the datasheet equation, RFSW ≈ 39.3 kΩ for fSW = 0.5 MHz (500 kHz).
Where to change it in the PSpice project
In the TI PSpice reference schematic, find the resistor that:
  • connects to the net/pin labeled FSW (pin 6), and
  • goes to AGND (often labeled something like R_FSW / RFSW / Rset)
Set that resistor to 39.2 kΩ (E96) or 39.0 kΩ (E24), depending on what you have available.
If you share a screenshot of the PSpice schematic around the FSW pin, I can point to the exact refdes to edit.
63 days
vtitanhardware

vtitanhardware

Screenshot 2026-03-10 171629.png

Image

63 days

flux

0:25

Thought for 2s

Running calculation.

In the schematic you shared, FSW is set by the resistor from the FSW pin down to AGND/ANAGND.
  • It’s the part labeled R164 (shown as 49.9 kΩ, 0402) connected directly to the FSW net (bottom-left of the IC) and to ANAGND/AGND.
To target ~500 kHz, change that resistor to 39.3 kΩ (E96; 39.2 kΩ is also a common pick).
So in your PSpice project: edit R164 value from 49.9 kΩ -> 39.3 kΩ.
Pull R164 to 400kHz
Check SW1/SW2 placement
Review decoupling issues
Verify PG/EN nets
Find 39.2k 0402
63 days
Sign up to send

Documents

    Documents are markdown text files which describe project goals, capture details, or even simulation outputs.

    Assets

    TPS552892RYQR-thumb.png

    TPS552892RYQR-thumb.png

    TPS552892RYQR-thumbThumbnail
    stp

    TPS552892RYQR.stp

    3D_TPS552892RYQR3D Model
    kicad_mod

    TPS552892RYQR.kicad_mod

    FP_TPS552892RYQRFootprint
    TPS552892RYQR

    TPS552892RYQR

    TPS552892RYQR Symbol.svgDefault

    TPS552892RYQR

    TPS552892RYQR thumbnail
    Buck-Boost Switching Regulator IC Positive Programmable 0.8V 1 Output 8A 21-PowerVFQFN #CommonPartsLibrary #IntegratedCircuit #PowerManagement #Voltage-regulator #Switching-regulator #TPS552892

    Properties

    Texas Instruments

    IC

    ti.com/lit/ds/symlink/tps552892.pdf?ts=1698770017628&ref_url=https%253A%252F%252Fwww.ti.com%252Fsitesearch%252Fen-us%252Fdocs%252Funiversalsearch.tsp%253FlangPref%253Den-US%2526searchTerm%253DTPS552892RYQR%2526nr%253D8

    TPS552892RYQR

    TPS552892RYQR

    Integrated Circuit

    Power Management

    creativecommons.org/licenses/by/4.0/

    Pricing & Availability

    See prices from popular manufacturers for your project.

    Controls