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I have charger circuit TP4056 based. My problem: Output voltage of TP4056 is very variable. Input voltage of TP4056 is about 5.4VDC from DC power supply. Output voltage is between 4.0V and 5.4. I changed input and output capacitor. The problem still persists.

I share charger circuit of PCB. Also i share ossiloscope printing screen of output.Please help me :)

Notes: Only the charging circuit part is assembled.Other component disassembled. In the problem I mentioned above, the battery is not mounted. I know that battery is not required for 4.2V output voltage according to datasheet.I bought TP4056 from LCSC.

tp4056 link: https://lcsc.com/product-detail/Battery-Management-ICs_TPOWER-TP4056_C382139.html

my charger circuit

[TP4056/ VDD-VBAT output printing screen2

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  • \$\begingroup\$ Probably too low current. Have you tried with a battery? \$\endgroup\$
    – winny
    Commented Apr 9, 2022 at 21:08
  • \$\begingroup\$ I didnt try. But I have tried. Max output voltage 4.320, Min output voltage 4.080V. Performance improved but not enough acc. to datasheet. Why do I have to connect a battery? Can't I use this IC as a regulator without a battery? Unfortunately TP4056 datasheet is not good :( @winny \$\endgroup\$
    – FAFİ
    Commented Apr 9, 2022 at 21:30
  • \$\begingroup\$ Probably not. Get an LDO if that’s what you want. \$\endgroup\$
    – winny
    Commented Apr 9, 2022 at 21:42

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