Li-ion Battery Charger Design

Set Voltage Rating to "25V" on C1 and C5, Set Role Details to "Protected input bulk capacito..." on C1, and 7 more changes

0:03

Set C1's Voltage Rating to "25V"

Set C1's Role Details to "Protected input bulk capacitor on VIN"

Set C2's Voltage Rating to "16V"

Set C2's Role Details to "Switching output bulk capacitor on VS"

Set C3's Voltage Rating to "16V"

Set C3's Role Details to "CS sense filter capacitor"

Set C4's Voltage Rating to "16V"

Set C4's Role Details to "Battery output bulk capacitor on BATT_PLUS"

Set C5's Voltage Rating to "25V"

Set C6's Voltage Rating to "10V"

Set C7's Voltage Rating to "10V"

Set C8's Voltage Rating to "16V"

Set C9's Voltage Rating to "50V"

Set R2's Power Rating to "0.5W"

33 days

Updated 4 connections

0:04

Connected U1:CS, C7:P1 to ^CS_2S

Connected R2:P1, C3:P2, U1:CS to ^CS_SENSE

Connected R7:P1, U1:VREG to ^TS_BIAS

Disconnected U1:CS, C7:P1, R2:P1, C3:P2, R7:P1

nets {

net GND = C6:P2, GND:GND, R1:P2, C4:P2, LED1:K, C1:P2, J1:Terminal, C5:P2, U1:EP, C8:P2, C2:P2, R3:P2, R7:P2, D2:K, C9:P2, C7:P2, R6:P2, U1:PWR_ON-, J2:PIN2, D1:A, U1:GND, LED2:K;

net RTRICK = U1:RTRICK, R3:P1;

net VIN_PROT = U1:4, U1:1, D1:K, U1:5, C5:P1, C1:P1, U1:16;

net LX = D2:A, L1:P1, R9:P1, U1:3, U1:2;

net BATT_PLUS = C4:P1, C8:P1, R2:P2, U1:BAT, C3:P1, J2:PIN1;

net STDBY_STAT = U1:~{STDBY}, R5:P2, LED2:A;

net TS_SENSE = R1:P1, U1:TS, R6:P1;

net VS = U1:VS, L1:P2, C2:P1;

net CHRG_STAT = LED1:A, U1:~{CHRG}, R4:P2;

net CS_2S = U1:CS, C3:P2, R2:P1, C7:P1;

net TS_BIAS = R7:P1, U1:VREG;

}

33 days

flux

0:00

Work done
  • Updated the project metadata and architecture for a 2S Sony NP-FZ100 charger with 9 V to 12 V DC input, 8.4 V CC/CV charging, C/10 termination, and protection requirements.
  • Added the complete charger/protection schematic around U1, including J1, F1, D1, Q1, D2, L1, J2, R1, R2, R3, R4, R5, R6, R7, R8, R9, C1, C2, C3, C4, C5, C6, C7, C8, C9, LED1, and LED2.
  • Wired the protected input path, switching charger stage, battery connector BATT_PLUS / GND, temperature-sense network, charge-current programming, and charge-status indicators, then corrected accidental net merges and floating pins.
  • Added build-oriented ratings/properties including capacitor voltage ratings and a higher power rating on R2.
Success criteria review
  • ✅ The schematic now implements a 2S 8.4 V switching charger using U1 with automatic termination support.
  • ✅ Safety elements are integrated: input overcurrent via F1, input surge clamp via D1, reverse polarity protection via Q1, and battery temperature monitoring via R1.
  • ✅ Battery connections are explicitly defined on J2, and ERC now reports no floating pins, no single-pin nets, and no missing power.
Next steps The schematic is ready for physical-constraint and PCB-layout preparation. I can set stackup, trace-width/clearance rules, and placement guidance for the charger power loop next.
33 days
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    Above Violet R2-D2 thumbnail
    Compact 2S Li-ion charger for Sony NP-FZ100 battery using DC input, 8.4 V CC/CV charging, automatic termination, reverse polarity, overvoltage, overcurrent, and thermal protection, with defined B+ and B- battery outputs and PCB-buildable component choices.

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