TP4056 - Under Voltage Lockout circuit - Page 1
Forum section: electronics / beginners

author: made2hack
author_rank: Frequent Contributor
timestamp: June 20, 2017, 03:29:28 pm
content: Hi all,I was wondering how I would implement an undervoltage lockout circuit usingthe TP4056. Is it even possible?Essentially I want the device to power off or cut-off power coming from the battery once the battery reaches 3.0 V (or whatever the undervoltage lockout is).The datasheet states that it offers under voltage lockout, but I'm not sure where? What pin? How would I implement it?I have the little charger board you can buy on ebay.Thanks

author: strawberry
author_rank: Super Contributor
timestamp: June 20, 2017, 04:25:49 pm
content: Can be used pin8(CE) to enable/disable the chipCan be used mosfet to turn off 5V power

author: sleemanj
author_rank: Super Contributor
timestamp: June 20, 2017, 09:54:26 pm
content: Wrong product. Tp4056 is a charger, it has nothing to do with discharge. Uvlo on tp4056 will mean it will not charge if the cell is very dead (without checking datasheet).What you want is the dw01 and 8205a combination cell protection.Some boards jnclude both 4056, and dw01+8205a for charge and protection in one

author: made2hack
author_rank: Frequent Contributor
timestamp: June 21, 2017, 02:19:55 pm
content: Ah ok,so what is meant is that the chip won't charge if VBat < 3.0 (or whatever the UVLO setting is).

author: rt
author_rank: Regular Contributor
timestamp: June 22, 2017, 01:41:40 pm
content: Quote from: made2hack on June 21, 2017, 02:19:55 pmNot quite. If VBat < 3.0 then the TP4056 will trickle charge the cell at I_trckl which is about C/10 (approx 100mA for a 1Amp setup, e.g R_prog=1.2K) until cell voltage exceeds V_trckl (2.9-3.0V).Quote from: sleemanj on June 20, 2017, 09:54:26 pm+1

author: BravoV
author_rank: Super Contributor
timestamp: June 22, 2017, 02:06:14 pm
content: Quote from: sleemanj on June 20, 2017, 09:54:26 pmOr, just the DW01+8205A board, its plenty on the net, example photo below compared to TO220 chip.

author: made2hack
author_rank: Frequent Contributor
timestamp: June 22, 2017, 05:00:08 pm
content: Yeah, so I got a board now with the DW01 and 8205 built in. But like Julian Ilett's video, the DW01 over-discharge protection voltage is 2.4V before the system powers off.Isn't 2.4V too low for a LiPo cell? Why would they do this? I mean, I suppose that the battery will temporarily recharge above 2.4, but doesn't it seem too low?ulian Ilett's

author: Didix
author_rank: Regular Contributor
timestamp: March 30, 2019, 06:58:57 pm
content: problem solved?I face the same problem. I am searching for a DW01 equivalent that shuts down at 3.2V -- or at an adjustable voltage.-Didix

author: Peabody
author_rank: Super Contributor
timestamp: March 30, 2019, 10:06:02 pm
content: In his video, Great Scott switched from the DW01 to the FS312F-G, which has a 2.9V cutoff rather than 2.4V. I think they are from the same manufacturer, and probably have the same pinout.At about 8:30 into the video.

author: stj
author_rank: Super Contributor
timestamp: March 31, 2019, 10:46:59 am
content: the TP4056 and protection boards are for LIon, 4.2v, NOT LIPo - your risking an explosion charging a 3.7v battery to 4.2v!!!

author: Habropoda
author_rank: Regular Contributor
timestamp: March 31, 2019, 07:58:11 pm
content: Quote from: stj on March 31, 2019, 10:46:59 amThat's odd; all of the Adafruit 3.7v lipo battery chargers charge to 4.2v. Are you saying they are blowing up their customers?!!?

author: stj
author_rank: Super Contributor
timestamp: April 01, 2019, 09:23:26 am
content: i'm saying read your battery datasheets.and maybe this one.

author: mikerj
author_rank: Super Contributor
timestamp: April 01, 2019, 04:17:09 pm
content: Quote from: stj on March 31, 2019, 10:46:59 amAll the Lithium Polymer cells I have encountered require charging to terminate at 4.2 volts. I think you may be confusing the average voltage of a lithium cobalt cell over it's discharge curve (3.7v) with it's peak voltage (4.2v).

author: stj
author_rank: Super Contributor
timestamp: April 02, 2019, 10:01:45 am
content: i thought lithium-polymer used a totally different charge profile - i know my charger wont charge them. (Lii-500)

author: beanflying
author_rank: Super Contributor
timestamp: April 02, 2019, 10:23:12 am
content: Quote from: stj on April 02, 2019, 10:01:45 amLiPo's are 4.2V max. and best charge chartacteristics are similar to what the TP4056 does. In model use our higher end chargers follow a similar strategy, gentle for over discharge, high current until mainly charged then tapering to 4.2 finish.To the OP if you need a holder and 5 or 3V on your board take a look at these for an all in one Charger/BMS/Regulator.18650 Module