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12V DC UPS Stabilizer Design

flux

2:59

Planning schematic queries.

Analyzing connectivity issues.

Analyzing the schematic.

Accessing knowledge base.

Looking for "Recommended Vdd connection and decoupling capacitor value" in 4357fd.pdf

Looking for "Typical application schematic decoupling and connections of IN, OUT, GATE, Vdd, GND" in 4357fd.pdf

Looking for "Absolute maximum ratings for Vdd, IN, OUT" in 4357fd.pdf

Looking for "Pin description Vdd and OUT pins" in 4357fd.pdf

Looking for "Typical application schematic" in 4357fd.pdf

Looking for "Pin descriptions Vdd OUT GATE" in 4357fd.pdf

Looking for "Bypass capacitor recommendation for Vdd to GND" in 4357fd.pdf

Looking for "Typical application schematic" in 4357fd.pdf

Looking for "Pin descriptions VDD OUT GATE" in 4357fd.pdf

Looking for "Bypass or decoupling capacitor recommendation for VDD" in 4357fd.pdf

Fetching schematic details.

Looks good overall. I checked your actual nets and here’s a focused review with any fixes.
What’s correct
  • Input chain and TVS
    • J1 → F1 → R1 → U1 IN and Q1 S are on U1.
    • D1 is across the input (cathode on J1 P1 via Net 4, anode to GND). Placement is correct.
  • Ideal‑diode stage
    • U1:OUT and Vdd are on the downstream node with Q1:D (NET_OUTPUT). Good.
    • U1:GATE to Q1:G only (Net 5). Correct.
  • Supercap bank and balance
    • SC1 → SC2 → SC3 → SC4 → SC5 → SC6 series is correct; SC6 P2 returns to GND.
    • Rbal1–Rbal6 each span their cell’s P1–P2 nets. Good.
  • Output filter
    • Q1 D → L1 P1; L1 P2 → J2 P1 with C1 220 µF and C2 100 nF to GND (Net 6). Correct.
Required fixes and recommendations
  • TVS part number: You specified 1.5KE18CA (bidirectional). The current device on D1 is 1.5KE18A (unidirectional). Replace it with 1.5KE18CA to match the requirement.
  • LTC4357 VDD decoupling (from the datasheet)
    • The datasheet states: “For applications up to 30 V, bypass the VDD pin with 39 µF; above 30 V use at least 100 µF. If VDD is powered from the output side, one capacitor serves to guard against VDD collapse and also protect OUT from voltage spikes. If OUT is diode-clamped or VDD is powered from input, use a separate 100 Ω, 100 nF filter (increase to 1 µF above 10 A).”
    • Action: Add a local VDD bypass for U1 per the above. In your case, with VDD tied to OUT, place a bypass from VDD/OUT to GND near U1.
  • Supercap properties: Your SC1–SC6 placeholders still say 256 F. Update to 25 F, 3 V and use a polarized footprint/symbol for the final MPN (Eaton TV1625-3R0256-R), since the real parts are polarized.
Want me to:
  • swap D1 to 1.5KE18CA,
  • add the LTC4357 VDD bypass per datasheet,
  • and update SC1–SC6 to 25 F/3 V?
Say “apply those fixes” and I’ll make the edits.
Ask about LTC4357 capacitor value
Supercap balancing check
TVS diode choice
Output LC sizing
Thermal on MOSFET
114 days
​
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J2
SC3
Capacitance
256 F
C2
Capacitance
100 nF
Rbal6
Resistance
1kΩ
Rbal4
Resistance
1kΩ
C1
Capacitance
220 µF
SC1
Capacitance
256 F
Rbal5
Resistance
1kΩ
Rbal3
Resistance
1kΩ
SC2
Capacitance
256 F
Rbal1
Resistance
1kΩ
SC5
Capacitance
256 F
SC4
Capacitance
256 F
SC6
Capacitance
256 F
C1 P1 - GND GND
Rbal2
Resistance
1kΩ
L1
Inductance
47 µH
Q1
D1
R1
Resistance
5 Ω
U1

Reviews

  • Ground
    Ground
    A common return path for electric current. Commonly known as ground.
    jharwinbarrozo
    20.5M
  • Net Portal
    Net Portal
    Wirelessly connects nets on schematic. Used to organize schematics and separate functional blocks. To wirelessly connect net portals, give them same designator. #portal
    jharwinbarrozo
    43.0M
  • Power Net Portal
    Power Net Portal
    Wirelessly connects power nets on schematic. Identical to the net portal, but with a power symbol. Used to organize schematics and separate functional blocks. To wirelessly connect power net portals, give them the same designator. #portal #power
    jharwinbarrozo
    11.4M
  • Generic Resistor
    Generic Resistor
    A generic fixed resistor ideal for rapid circuit topology development. Its footprint automatically adapts based on the selected package case code—supporting 0402, 0603, 0805, 1203, and many other standard SMD packages, as well as axial horizontal and vertical configurations. Save precious design time by seamlessly add more information to this part (value, footprint, etc.) as it becomes available. Standard resistor values: 1.0 ohm, 10 ohm, 100 ohm, 1.0k ohm, 10k ohm, 100k ohm, 1.0M ohm 1.1 ohm, 11 ohm, 110 ohm, 1.1k ohm, 11k ohm, 110k ohm, 1.1M ohm 1.2 ohm, 12 ohm, 120 ohm, 1.2k ohm, 12k ohm, 120k ohm, 1.2M ohm 1.3 ohm, 13 ohm, 130 ohm, 1.3k ohm, 13k ohm, 130k ohm, 1.3M ohm 1.5 ohm, 15 ohm, 150 ohm, 1.5k ohm, 15k ohm, 150k ohm, 1.5M ohm 1.6 ohm, 16 ohm, 160 ohm, 1.6k ohm, 16k ohm, 160k ohm, 1.6M ohm 1.8 ohm, 18 ohm, 180 ohm, 1.8K ohm, 18k ohm, 180k ohm, 1.8M ohm 2.0 ohm, 20 ohm, 200 ohm, 2.0k ohm, 20k ohm, 200k ohm, 2.0M ohm 2.2 ohm, 22 ohm, 220 ohm, 2.2k ohm, 22k ohm, 220k ohm, 2.2M ohm 2.4 ohm, 24 ohm, 240 ohm, 2.4k ohm, 24k ohm, 240k ohm, 2.4M ohm 2.7 ohm, 27 ohm, 270 ohm, 2.7k ohm, 27k ohm, 270k ohm, 2.7M ohm 3.0 ohm, 30 ohm, 300 ohm, 3.0K ohm, 30K ohm, 300K ohm, 3.0M ohm 3.3 ohm, 33 ohm, 330 ohm, 3.3k ohm, 33k ohm, 330k ohm, 3.3M ohm 3.6 ohm, 36 ohm, 360 ohm, 3.6k ohm, 36k ohm, 360k ohm, 3.6M ohm 3.9 ohm, 39 ohm, 390 ohm, 3.9k ohm, 39k ohm, 390k ohm, 3.9M ohm 4.3 ohm, 43 ohm, 430 ohm, 4.3k ohm, 43K ohm, 430K ohm, 4.3M ohm 4.7 ohm, 47 ohm, 470 ohm, 4.7k ohm, 47k ohm, 470k ohm, 4.7M ohm 5.1 ohm, 51 ohm, 510 ohm, 5.1k ohm, 51k ohm, 510k ohm, 5.1M ohm 5.6 ohm, 56 ohm, 560 ohm, 5.6k ohm, 56k ohm, 560k ohm, 5.6M ohm 6.2 ohm, 62 ohm, 620 ohm, 6.2k ohm, 62K ohm, 620K ohm, 6.2M ohm 6.8 ohm, 68 ohm, 680 ohm, 6.8k ohm, 68k ohm, 680k ohm, 6.8M ohm 7.5 ohm, 75 ohm, 750 ohm, 7.5k ohm, 75k ohm, 750k ohm, 7.5M ohm 8.2 ohm, 82 ohm, 820 ohm, 8.2k ohm, 82k ohm, 820k ohm, 8.2M ohm 9.1 ohm, 91 ohm, 910 ohm, 9.1k ohm, 91k ohm, 910k ohm, 9.1M ohm #generics #CommonPartsLibrary
    jharwinbarrozo
    1.5M
  • Generic Capacitor
    Generic Capacitor
    A generic fixed capacitor ideal for rapid circuit topology development. You can choose between polarized and non-polarized types, its symbol and the footprint will automatically adapt based on your selection. Supported options include standard SMD sizes for ceramic capacitors (e.g., 0402, 0603, 0805), SMD sizes for aluminum electrolytic capacitors, and through-hole footprints for polarized capacitors. Save precious design time by seamlessly add more information to this part (value, footprint, etc.) as it becomes available. Standard capacitor values: 1.0pF, 10pF, 100pF, 1000pF, 0.01uF, 0.1uF, 1.0uF, 10uF, 100uF, 1000uF, 10000uF 1.1pF, 11pF, 110pF, 1100pF 1.2pF, 12pF, 120pF, 1200pF 1.3pF, 13pF, 130pF, 1300pF 1.5pF, 15pF, 150pF, 1500pF, 0.015uF, 0.15uF, 1.5uF, 15uF, 150uF, 1500uF 1.6pF, 16pF, 160pF, 1600pF 1.8pF, 18pF, 180pF, 1800pF 2.0pF, 20pF, 200pF, 2000pF 2.2pF, 22pF, 220pF, 2200pF, 0.022uF, 0.22uF, 2.2uF, 22uF, 220uF, 2200uF 2.4pF, 24pF, 240pF, 2400pF 2.7pF, 27pF, 270pF, 2700pF 3.0pF, 30pF, 300pF, 3000pF 3.3pF, 33pF, 330pF, 3300pF, 0.033uF, 0.33uF, 3.3uF, 33uF, 330uF, 3300uF 3.6pF, 36pF, 360pF, 3600pF 3.9pF, 39pF, 390pF, 3900pF 4.3pF, 43pF, 430pF, 4300pF 4.7pF, 47pF, 470pF, 4700pF, 0.047uF, 0.47uF, 4.7uF, 47uF, 470uF, 4700uF 5.1pF, 51pF, 510pF, 5100pF 5.6pF, 56pF, 560pF, 5600pF 6.2pF, 62pF, 620pF, 6200pF 6.8pF, 68pF, 680pF, 6800pF, 0.068uF, 0.68uF, 6.8uF, 68uF, 680uF, 6800uF 7.5pF, 75pF, 750pF, 7500pF 8.2pF, 82pF, 820pF, 8200pF 9.1pF, 91pF, 910pF, 9100pF #generics #CommonPartsLibrary
    jharwinbarrozo
    1.5M
  • Generic Inductor
    Generic Inductor
    A generic fixed inductor suitable for rapid circuit topology development. The footprint automatically adapts based on the selected package, supporting standard SMD sizes (e.g., 0402, 0603, 0805) as well as well-known inductor packages such as SDR1806, PA4320, SRN6028, and SRR1260. Standard inductor values: 1.0 nH, 10 nH, 100 nH, 1.0 µH, 10 µH, 100 µH, 1.0 mH 1.2 nH, 12 nH, 120 nH, 1.2 µH, 12 µH, 120 µH, 1.2 mH 1.5 nH, 15 nH, 150 nH, 1.5 µH, 15 µH, 150 µH, 1.5 mH 1.8 nH, 18 nH, 180 nH, 1.8 µH, 18 µH, 180 µH, 1.8 mH 2.2 nH, 22 nH, 220 nH, 2.2 µH, 22 µH, 220 µH, 2.2 mH 2.7 nH, 27 nH, 270 nH, 2.7 µH, 27 µH, 270 µH, 2.7 mH 3.3 nH, 33 nH, 330 nH, 3.3 µH, 33 µH, 330 µH, 3.3 mH 3.9 nH, 39 nH, 390 nH, 3.9 µH, 39 µH, 390 µH, 3.9 mH 4.7 nH, 47 nH, 470 nH, 4.7 µH, 47 µH, 470 µH, 4.7 mH 5.6 nH, 56 nH, 560 nH, 5.6 µH, 56 µH, 560 µH, 5.6 mH 6.8 nH, 68 nH, 680 nH, 6.8 µH, 68 µH, 680 µH, 6.8 mH 8.2 nH, 82 nH, 820 nH, 8.2 µH, 82 µH, 820 µH, 8.2 mH #generics #CommonPartsLibrary
    jharwinbarrozo
    15.8k
  • Terminal
    Terminal
    An electrical connector acting as reusable interface to a conductor and creating a point where external circuits can be connected.
    natarius
  • RMCF0805JT47K0
    RMCF0805JT47K0
    General Purpose Thick Film Standard Power and High-Power Chip Resistor 47 kOhms ±5% 0.125W, 1/8W Chip Resistor 0805 (2012 Metric) Automotive AEC-Q200 Thick Film Features: - RMCF – standard power ratings - RMCP – high power ratings - Nickel barrier terminations standard - Power derating from 100% at 70ºC to zero at +155ºC - RoHS compliant, REACH compliant, and halogen free - AEC-Q200 compliant
    jharwinbarrozo
    1.2M
  • 875105359001
    875105359001
    10 µF 16 V Aluminum - Polymer Capacitors Radial, Can - SMD 30mOhm 2000 Hrs @ 105°C #commonpartslibrary #capacitor #aluminumpolymer #radialcan
    jharwinbarrozo
    1.2M
  • CTL1206FYW1T
    CTL1206FYW1T
    Yellow 595nm LED Indication - Discrete 1.7V 1206 (3216 Metric)
    jharwinbarrozo
    1.1M
Big Emerald R2-D2 thumbnail
12 V Automotive UPS-Style Supercapacitor Power Stabilizer

Properties

V
Diagram



  
    
  
  
    
  



""Input Protection""















"Input Terminal"
"7.5A Blade Fuse"
"5Ω >15J NTC Thermistor"
"LTC4357 + IPT015N10N5 Ideal-Diode Stage"
"6S1P Supercapacitor Bank\n(Eaton TV1625-3R0256-R x6)"
"Output LC Filter\n(47µH Inductor, 220µF Electrolytic, node_100nF Ceramic)"
"Output Terminal"
"1.5KE18CA TVS Diode"

Pricing & Availability

Distributor

Qty 1

Arrow

$3.35–$4.83

Digi-Key

$5.62

LCSC

$7.06–$7.16

Mouser

$6.18

TME

$0.33

Verical

$11.06–$13.29

Controls

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