Unknown IC (PZGZK Q218) from charger Dynamite DYN4113 - Page 1
Forum section: electronics / repair

author: juju1970
author_rank: Newbie
timestamp: July 05, 2023, 06:32:05 am
content: HelloI need help identifying the component - IC from charger Dynamite DYN4113. IC is marked PZGZK Q218. The element is burned - short circuit between + and -. I didn't find any information on the internet. I didn't find a scheme of the charger. If anyone has any information, it will help me.On board are removed also U3 - 7805 and U6 - LM2904. U2 is unknown IC.

author: fzabkar
author_rank: Super Contributor
timestamp: July 05, 2023, 08:09:28 pm
content: Can you identify the IC's supply pins? How is the optocoupler (?) driven? Is there a power semi on the other side that carries the output current, or does the charger regulate the supply directly at the transformer?

author: juju1970
author_rank: Newbie
timestamp: July 06, 2023, 05:27:53 am
content: Power supply of IC i think is - plus 5 V - pin 8, minus - pin 1. The charger regulate the supply directly at the transformer. This IC controls a optocoupler. There were actually burnt elements in the primary side (resistors and transistors). When I replaced them the charger worked. Because the resistors were burnt and their value was not visible, I put approximate ones that I saw on similar schemes. I found that the charging current is very small - about 10 mA. So I started reducing R30 (I drew the diagram of primary side) . But I reduced it too much from 220 ohms to 100 ohms. Then the secondary voltage became larger and the 7805 and this IC burned.For this reason I am looking for information about this IC so that I can replace or simulate it.

author: fzabkar
author_rank: Super Contributor
timestamp: July 06, 2023, 09:59:23 pm
content: http://shop.minigroup.fr/images/pdf/61409/notice_dyn4113.pdfQuoteI wonder how it does this. It must sense the voltage and current. There is no thermal sensing.If the regulated output voltage is being varied by U2, then I presume that the 7805 provides a constant 5V supply for the ICs. However, 5 cells produce around 6V, so that leaves only a small margin for the regulator. :-?

author: juju1970
author_rank: Newbie
timestamp: July 07, 2023, 09:32:06 am
content: There is 2 secondary coils. One is for 7805, which supply lm2904 and this IC. Second coil give power by 2 diodes to battery.

author: fzabkar
author_rank: Super Contributor
timestamp: July 08, 2023, 05:37:19 am
content: It might be helpful if you could trace the circuit around U2. If possible, show us how it controls the optocoupler, and identify the voltage sense and current sense (?) inputs. I confess that I have not encountered such a topology before. Maybe I'm not alone?

author: asis
author_rank: Frequent Contributor
timestamp: July 08, 2023, 07:48:17 am
content: Hi,Perhaps this is a Chinese clone of TSM103.A circuit for monitoring the connection of the battery and limiting the charge current has been implemented.You need to paint the "cold part".Simply, there is not a single TL431 support in the photo.Although, it can also be in the SO8 package.https://datasheetspdf.com/datasheet/search.php?sWord=TSM103

author: fzabkar
author_rank: Super Contributor
timestamp: July 08, 2023, 08:53:09 am
content: Another possibility (includes application note for battery charger with auxiliary winding).TSM101/A - voltage and current controller:https://www.win-source.net/datasheet/199781/M101AC.pdfQuoteAnother one - TSM1012:https://shelfkey.com/DataSheets/3003197.pdf

author: juju1970
author_rank: Newbie
timestamp: July 26, 2023, 06:03:45 am
content: Hello. I found time and made the circuit of the secondary part. The input In is not used. The pin numbers of U2 may be rotated 90 degrees, because pin 1is not marked.The question remains, what kind of integrated circuit is U2 ?

author: fzabkar
author_rank: Super Contributor
timestamp: July 26, 2023, 06:44:25 pm
content: I assume that "218" is a YWW date code. Does it match the date codes on the other ICs?If the Vcc and Ground pins were interchanged, the chip could be an 8-pin PIC. Would an 8-bit uC (not a PIC) fit this application??BTW, pins 5, 6 and 7 of U6 are configured as a voltage follower (for current sensing), but the output goes nowhere. How does U2 sense the charging current? Does "not used in" (R10 at U2 pin 3) connect to U6 pin 7?You say that pin 1 is not marked. Obviously the dimple on the IC is pin 1, so are you saying that you have forgotten how the IC was oriented on the PCB? :-?

author: juju1970
author_rank: Newbie
timestamp: July 27, 2023, 02:05:24 pm
content: "218" code may be a date, but it doesn't match the other chips.Pins 5,6 and 7 of U6 are indeed configured as a voltage follower, but it is not used. I checked several times - pin 7 is only connected to pin 6 - you can even see it from the picture of the board if you zoom in. In my opinion, the charging current is monitored only through pin 3 of U6.I have not forgotten how U6 was oriented (I also remember how the inscription was read), but I had not noticed the dimple. So this is the correct pin numbering.

author: fzabkar
author_rank: Super Contributor
timestamp: July 27, 2023, 06:37:44 pm
content: Pin 5 of U2 must be controlling the charging current, but it appears to be doing so in open loop mode. :-?I also don't understand R32 and C1. Should they be in parallel? :-?

author: juju1970
author_rank: Newbie
timestamp: July 28, 2023, 06:01:01 am
content: R32 is not in parallel with C1 -this can be seen in the picture. Аlso here you can see how all the pins of U2 are connected. Pin 5 is connected to pin 3 and through R21 to R18. Also through C14 to GND. Pin 6 only to pin 7. Maybe in this application not used.

author: fzabkar
author_rank: Super Contributor
timestamp: July 29, 2023, 12:00:58 am
content: I'm trying to make sense of U6 in order to understand U2, but I just can't get my head around it.I suspect that U2 could be an 8-bit or 4-bit MCU, but I haven't been able to find a suitable candidate. If U2 were a special function charging IC, then I would expect that it would normally incorporate the current sensing and control functions of U6, otherwise why bother. That is, if one were designing a special function charging IC, then one would expect it to do everything.