Buck Converter Design Guidance

Thought for 3 mins 4 sec

Set U1 PH - L1 P1's Part Type to "Portal"
Set U1 PH - L1 P1's Exclude from BOM to "true"
Set U1 PH - L1 P1's Exclude from PCB to "true"
Set U1 PH - L1 P1's Designator Prefix to "Net"
Set L1 P2 - COUT1 P1's Part Type to "Portal"
Set L1 P2 - COUT1 P1's Exclude from BOM to "true"
Set L1 P2 - COUT1 P1's Exclude from PCB to "true"
Set L1 P2 - COUT1 P1's Designator Prefix to "Net"
Set U1 BOOT - CBOOT1 P1's Part Type to "Portal"
Set U1 BOOT - CBOOT1 P1's Exclude from BOM to "true"
Set U1 BOOT - CBOOT1 P1's Exclude from PCB to "true"
Set U1 BOOT - CBOOT1 P1's Designator Prefix to "Net"
Set RCOMP1's Part Type to "Resistor"
Set RCOMP1's Designator Prefix to "R"
Set RCOMP1's Resistance to "3.74kΩΩ"
Set RCOMP1's Package to "SMD_0603_1608Metric"
Set RCOMP1's Role to "Compensation"
Set RCOMP1's Role Details to "COMP series resistor per datasheet example 5V design; tune if output caps/inductor differ"
Set RCOMP1 P2 - CCOMP1 P1's Part Type to "Portal"
Set RCOMP1 P2 - CCOMP1 P1's Exclude from BOM to "true"
Set RCOMP1 P2 - CCOMP1 P1's Exclude from PCB to "true"
Set RCOMP1 P2 - CCOMP1 P1's Designator Prefix to "Net"
Set RFBT1's Part Type to "Resistor"
Set RFBT1's Designator Prefix to "R"
Set RFBT1's Resistance to "220kΩΩ"
Set RFBT1's Package to "SMD_0603_1608Metric"
Set RFBT1's Role to "Feedback"
Set RFBT1's Role Details to "Upper resistor from VOUT to VSENSE; based on datasheet typical 5V design"
Set CCOMP1's Package to "SMD_0603_1608Metric"
Set CCOMP1's Designator Prefix to "C"
Set CCOMP1's Part Type to "Non-Polarized Capacitor"
Set CCOMP1's Capacitance to "12nFF"
Set CCOMP1's Role to "Compensation"
Set CCOMP1's Role Details to "COMP capacitor per datasheet example (0.012uF) for 5V design"
Set U1 VSENSE - RFBT1 P2's Part Type to "Portal"
Set U1 VSENSE - RFBT1 P2's Exclude from BOM to "true"
Set U1 VSENSE - RFBT1 P2's Exclude from PCB to "true"
Set U1 VSENSE - RFBT1 P2's Designator Prefix to "Net"
Set U1 COMP - RCOMP1 P1's Part Type to "Portal"
Set U1 COMP - RCOMP1 P1's Exclude from BOM to "true"
Set U1 COMP - RCOMP1 P1's Exclude from PCB to "true"
Set U1 COMP - RCOMP1 P1's Designator Prefix to "Net"
Set CCOMP2's Package to "SMD_0603_1608Metric"
Set CCOMP2's Designator Prefix to "C"
Set CCOMP2's Part Type to "Non-Polarized Capacitor"
Set CCOMP2's Capacitance to "120pFF"
Set CCOMP2's Role to "Compensation"
Set CCOMP2's Role Details to "Feed-forward/high-frequency pole cap per datasheet example (120pF)"
Set DTVS1's LCSC Part Number to "C133666"
Set DTVS1's Datasheet URL to "https://storage.googleapis.com/graviton-electric-symbols/document_assets/lcsc/2304140030_STMicroelectronics-SMBJ26A-TR_C13366..."
Set DTVS1's Part Type to "TVS"
Set DTVS1's Designator Prefix to "D"
Set DTVS1's Manufacturer Part Number to "SMBJ26A-TR"
Set DTVS1's Package or Case Code to "SMB_L4.6-W3.6-LS5.3-RD"
Set DTVS1's Product Info Url to "https://lcsc.com/product-detail/TVS_STMicroelectronics_SMBJ26A-TR_SMBJ26A-TR_C133666.html"
Set DTVS1's Manufacturer Name to "ST(意法半导体)"
Set DTVS1's JLCPCB Part Class to "Extended Part"
Set DTVS1's Package to "SMB"
Set DTVS1's Role to "Protection"
Set DTVS1's Role Details to "Unidirectional TVS from VIN to GND at input connector for 24V nominal cable-fed supply"
Set U1 VSENSE - RFBT1 P2's Part Type to "Portal"
Set U1 VSENSE - RFBT1 P2's Exclude from BOM to "true"
Set U1 VSENSE - RFBT1 P2's Exclude from PCB to "true"
Set U1 VSENSE - RFBT1 P2's Designator Prefix to "Net"
Set U1 GND - U1 EP's Part Type to "Portal"
Set U1 GND - U1 EP's Exclude from BOM to "true"
Set U1 GND - U1 EP's Exclude from PCB to "true"
Set U1 GND - U1 EP's Designator Prefix to "Net"
Set U1 GND - U1 EP's Part Type to "Portal"
Set U1 GND - U1 EP's Exclude from BOM to "true"
Set U1 GND - U1 EP's Exclude from PCB to "true"
Set U1 GND - U1 EP's Designator Prefix to "Net"
Set U1 GND - U1 EP's Part Type to "Portal"
Set U1 GND - U1 EP's Exclude from BOM to "true"
Set U1 GND - U1 EP's Exclude from PCB to "true"
Set U1 GND - U1 EP's Designator Prefix to "Net"
Set U1 VIN - CIN1 P1's Part Type to "Portal"
Set U1 VIN - CIN1 P1's Exclude from BOM to "true"
Set U1 VIN - CIN1 P1's Exclude from PCB to "true"
Set U1 VIN - CIN1 P1's Designator Prefix to "Net"
Set U1 GND - U1 EP's Part Type to "Portal"
Set U1 GND - U1 EP's Exclude from BOM to "true"
Set U1 GND - U1 EP's Exclude from PCB to "true"
Set U1 GND - U1 EP's Designator Prefix to "Net"
Set U1 GND - U1 EP's Part Type to "Portal"
Set U1 GND - U1 EP's Exclude from BOM to "true"
Set U1 GND - U1 EP's Exclude from PCB to "true"
Set U1 GND - U1 EP's Designator Prefix to "Net"
Set U1 GND - U1 EP's Part Type to "Portal"
Set U1 GND - U1 EP's Exclude from BOM to "true"
Set U1 GND - U1 EP's Exclude from PCB to "true"
Set U1 GND - U1 EP's Designator Prefix to "Net"
Set CSS1's Package to "SMD_0603_1608Metric"
Set CSS1's Designator Prefix to "C"
Set CSS1's Part Type to "Non-Polarized Capacitor"
Set CSS1's Capacitance to "10nFF"
Set CSS1's Role to "Soft-Start"
Set CSS1's Role Details to "Soft-start capacitor on U1 SS pin; default value matching datasheet typical 0.01uF"
Set U1 VIN - CIN1 P1's Part Type to "Portal"
Set U1 VIN - CIN1 P1's Exclude from BOM to "true"
Set U1 VIN - CIN1 P1's Exclude from PCB to "true"
Set U1 VIN - CIN1 P1's Designator Prefix to "Net"
Set CIN3's Package to "SMD_1210_3225Metric"
Set CIN3's Designator Prefix to "C"
Set CIN3's Part Type to "Non-Polarized Capacitor"
Set CIN3's Capacitance to "10uFF"
Set CIN3's Role to "Decoupling"
Set CIN3's Role Details to "Additional input MLCC for ripple current and cable-fed source impedance"
Set U1 SS - CSS1 P1's Part Type to "Portal"
Set U1 SS - CSS1 P1's Exclude from BOM to "true"
Set U1 SS - CSS1 P1's Exclude from PCB to "true"
Set U1 SS - CSS1 P1's Designator Prefix to "Net"
Set EN's Part Type to "Portal"
Set EN's Exclude from BOM to "true"
Set EN's Exclude from PCB to "true"
Set EN's Designator Prefix to "Net"
Set U1 GND - U1 EP's Part Type to "Portal"
Set U1 GND - U1 EP's Exclude from BOM to "true"
Set U1 GND - U1 EP's Exclude from PCB to "true"
Set U1 GND - U1 EP's Designator Prefix to "Net"
Set COUT2's Package to "SMD_1210_3225Metric"
Set COUT2's Designator Prefix to "C"
Set COUT2's Part Type to "Non-Polarized Capacitor"
Set COUT2's Capacitance to "47uFF"
Set COUT2's Role to "Bulk"
Set COUT2's Role Details to "Output MLCC bulk; part of output capacitor bank"
Set U1 VIN - CIN1 P1's Part Type to "Portal"
Set U1 VIN - CIN1 P1's Exclude from BOM to "true"
Set U1 VIN - CIN1 P1's Exclude from PCB to "true"
Set U1 VIN - CIN1 P1's Designator Prefix to "Net"
Set U1 PH - L1 P1's Part Type to "Portal"
Set U1 PH - L1 P1's Exclude from BOM to "true"
Set U1 PH - L1 P1's Exclude from PCB to "true"
Set U1 PH - L1 P1's Designator Prefix to "Net"
Set RCOMP1 P2 - CCOMP1 P1's Part Type to "Portal"
Set RCOMP1 P2 - CCOMP1 P1's Exclude from BOM to "true"
Set RCOMP1 P2 - CCOMP1 P1's Exclude from PCB to "true"
Set RCOMP1 P2 - CCOMP1 P1's Designator Prefix to "Net"
Set CIN1's Package to "SMD_0603_1608Metric"
Set CIN1's Designator Prefix to "C"
Set CIN1's Part Type to "Non-Polarized Capacitor"
Set CIN1's Capacitance to "100nFF"
Set CIN1's Role to "Decoupling"
Set CIN1's Role Details to "HF decoupling for U1 VIN pin to GND"
Set U1 BOOT - CBOOT1 P1's Part Type to "Portal"
Set U1 BOOT - CBOOT1 P1's Exclude from BOM to "true"
Set U1 BOOT - CBOOT1 P1's Exclude from PCB to "true"
Set U1 BOOT - CBOOT1 P1's Designator Prefix to "Net"
Set U1 PH - L1 P1's Part Type to "Portal"
Set U1 PH - L1 P1's Exclude from BOM to "true"
Set U1 PH - L1 P1's Exclude from PCB to "true"
Set U1 PH - L1 P1's Designator Prefix to "Net"
Set L1 P2 - COUT1 P1's Part Type to "Portal"
Set L1 P2 - COUT1 P1's Exclude from BOM to "true"
Set L1 P2 - COUT1 P1's Exclude from PCB to "true"
Set L1 P2 - COUT1 P1's Designator Prefix to "Net"
Set CIN2's Package to "SMD_1210_3225Metric"
Set CIN2's Designator Prefix to "C"
Set CIN2's Part Type to "Non-Polarized Capacitor"
Set CIN2's Capacitance to "10uFF"
Set CIN2's Role to "Decoupling"
Set CIN2's Role Details to "Input ceramic bulk for buck hot loop; place at U1 VIN/GND"
Set U1 COMP - RCOMP1 P1's Part Type to "Portal"
Set U1 COMP - RCOMP1 P1's Exclude from BOM to "true"
Set U1 COMP - RCOMP1 P1's Exclude from PCB to "true"
Set U1 COMP - RCOMP1 P1's Designator Prefix to "Net"
Set U1 VIN - CIN1 P1's Part Type to "Portal"
Set U1 VIN - CIN1 P1's Exclude from BOM to "true"
Set U1 VIN - CIN1 P1's Exclude from PCB to "true"
Set U1 VIN - CIN1 P1's Designator Prefix to "Net"
Set U1 VIN - CIN1 P1's Part Type to "Portal"
Set U1 VIN - CIN1 P1's Exclude from BOM to "true"
Set U1 VIN - CIN1 P1's Exclude from PCB to "true"
Set U1 VIN - CIN1 P1's Designator Prefix to "Net"
Set U1 SS - CSS1 P1's Part Type to "Portal"
Set U1 SS - CSS1 P1's Exclude from BOM to "true"
Set U1 SS - CSS1 P1's Exclude from PCB to "true"
Set U1 SS - CSS1 P1's Designator Prefix to "Net"
Set COUT1's Package to "SMD_1210_3225Metric"
Set COUT1's Designator Prefix to "C"
Set COUT1's Part Type to "Non-Polarized Capacitor"
Set COUT1's Capacitance to "47uFF"
Set COUT1's Role to "Bulk"
Set COUT1's Role Details to "Output MLCC bulk; part of output capacitor bank"
Set U1 GND - U1 EP's Part Type to "Portal"
Set U1 GND - U1 EP's Exclude from BOM to "true"
Set U1 GND - U1 EP's Exclude from PCB to "true"
Set U1 GND - U1 EP's Designator Prefix to "Net"
Set U1 GND - U1 EP's Part Type to "Portal"
Set U1 GND - U1 EP's Exclude from BOM to "true"
Set U1 GND - U1 EP's Exclude from PCB to "true"
Set U1 GND - U1 EP's Designator Prefix to "Net"
Set U1 GND - U1 EP's Part Type to "Portal"
Set U1 GND - U1 EP's Exclude from BOM to "true"
Set U1 GND - U1 EP's Exclude from PCB to "true"
Set U1 GND - U1 EP's Designator Prefix to "Net"
Set U1 GND - U1 EP's Part Type to "Portal"
Set U1 GND - U1 EP's Exclude from BOM to "true"
Set U1 GND - U1 EP's Exclude from PCB to "true"
Set U1 GND - U1 EP's Designator Prefix to "Net"
Set COUT3's Package to "SMD_0603_1608Metric"
Set COUT3's Designator Prefix to "C"
Set COUT3's Part Type to "Non-Polarized Capacitor"
Set COUT3's Capacitance to "100nFF"
Set COUT3's Role to "Decoupling"
Set COUT3's Role Details to "HF decoupling from 5V rail to GND near inductor/cap node"
Set U1 GND - U1 EP's Part Type to "Portal"
Set U1 GND - U1 EP's Exclude from BOM to "true"
Set U1 GND - U1 EP's Exclude from PCB to "true"
Set U1 GND - U1 EP's Designator Prefix to "Net"
Set CBOOT1's Package or Case Code to "SMD_0603_1608Metric"
Set CBOOT1's Designator Prefix to "C"
Set CBOOT1's Part Type to "Non-Polarized Capacitor"
Set CBOOT1's Capacitance to "100nFF"
Set CBOOT1's Role to "Bootstrap"
Set CBOOT1's Role Details to "Bootstrap capacitor for U1 BOOT-PH per datasheet typical application"
Set CINBULK1's Package to "CP_Elec_8x10"
Set CINBULK1's Designator Prefix to "C"
Set CINBULK1's Part Type to "Non-Polarized Capacitor"
Set CINBULK1's Capacitance to "100uFF"
Set CINBULK1's Role to "Bulk"
Set CINBULK1's Role Details to "Bulk input capacitance for cable-induced transients; locate near VIN entry"
Set L1 P2 - COUT1 P1's Part Type to "Portal"
Set L1 P2 - COUT1 P1's Exclude from BOM to "true"
Set L1 P2 - COUT1 P1's Exclude from PCB to "true"
Set L1 P2 - COUT1 P1's Designator Prefix to "Net"
Set L1's Package to "SMD_SRR1260"
Set L1's Designator Prefix to "L"
Set L1's Inductance to "15uHH"
Set L1's Part Type to "Inductor"
Set L1's Role to "Energy Storage"
Set L1's Role Details to "Buck inductor; target ~0.6A ripple at 2A max, Vin 25V, Vout 5V, fSW 500kHz"
Set U1 COMP - RCOMP1 P1's Part Type to "Portal"
Set U1 COMP - RCOMP1 P1's Exclude from BOM to "true"
Set U1 COMP - RCOMP1 P1's Exclude from PCB to "true"
Set U1 COMP - RCOMP1 P1's Designator Prefix to "Net"
Set U1 VSENSE - RFBT1 P2's Part Type to "Portal"
Set U1 VSENSE - RFBT1 P2's Exclude from BOM to "true"
Set U1 VSENSE - RFBT1 P2's Exclude from PCB to "true"
Set U1 VSENSE - RFBT1 P2's Designator Prefix to "Net"
Set RFBB1's Part Type to "Resistor"
Set RFBB1's Designator Prefix to "R"
Set RFBB1's Resistance to "43.2kΩΩ"
Set RFBB1's Package to "SMD_0603_1608Metric"
Set RFBB1's Role to "Feedback"
Set RFBB1's Role Details to "Lower resistor from VSENSE to GND; with RFBT1 sets 5V output"
Set U1 GND - U1 EP's Part Type to "Portal"
Set U1 GND - U1 EP's Exclude from BOM to "true"
Set U1 GND - U1 EP's Exclude from PCB to "true"
Set U1 GND - U1 EP's Designator Prefix to "Net"
Set U1 GND - U1 EP's Part Type to "Portal"
Set U1 GND - U1 EP's Exclude from BOM to "true"
Set U1 GND - U1 EP's Exclude from PCB to "true"
Set U1 GND - U1 EP's Designator Prefix to "Net"
Set L1 P2 - COUT1 P1's Part Type to "Portal"
Set L1 P2 - COUT1 P1's Exclude from BOM to "true"
Set L1 P2 - COUT1 P1's Exclude from PCB to "true"
Set L1 P2 - COUT1 P1's Designator Prefix to "Net"
Set U1's Manufacturer Name to "TI(德州仪器)"
Set U1's Manufacturer Part Number to "TPS54336ADRCR"
Set U1's LCSC Part Number to "C2070667"
Set U1's Package or Case Code to "VSON-10_L3.0-W3.0-P0.50-TL-EP"
Set U1's Designator Prefix to "U"
Set U1's Part Type to "DC-DC Converters"
Set U1's JLCPCB Part Class to "Extended Part"
Set U1's Package to "VSON-10 3x3 EP"
Set U1's Role to "Regulator"
Set U1's Role Details to "TPS54336ADRCR buck converter controller + integrated FETs for 24V nominal to 5V output"
Set U1 VIN - CIN1 P1's Part Type to "Portal"
Set U1 VIN - CIN1 P1's Exclude from BOM to "true"
Set U1 VIN - CIN1 P1's Exclude from PCB to "true"
Set U1 VIN - CIN1 P1's Designator Prefix to "Net"

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TPS54336A (TPS54336ADRCR) - Calculation Proof of Work (24 V -> 5 V, 0.1 A to 2 A)

This document re-derives the key peripheral component calculations from the TPS54336A datasheet PDF provided by the user and checks them against the values currently set in the schematic.

1) Design targets (given)

VIN range: 23 V to 25 V (24 V nominal)
VOUT: 5.0 V
IOUT range: 0.1 A to 2.0 A
Load steps: 300 mA steps up to 2 A
Allowed output ripple: VSENSE) and lower resistor = RFBB (VSENSE->GND):

VOUT = VREF x (RFBT/RFBB + 1)

2.2 Switching frequency

From datasheet:

"The TPS54336A device has a fixed 340-kHz switching frequency."
Internal switching frequency (TPS54336A): 272 kHz (min), 340 kHz (typ), 408 kHz (max)

2.3 Inductor selection