SH6GC - Regulator SMT code help - Page 1
Forum section: electronics / repair

author: PKTKS
author_rank: Super Contributor
timestamp: December 18, 2021, 03:22:07 pm
content: Hi there...Having a hard time trying to find the proper datasheetfor this regulator...I know for sure it is a regulator..I guess with pretty confidence it should be a boost...nah... re-scanned circuit and actually more like an LDOAll I have tried so far leads to the TOREX XC6371 in SOT89-5It happens that the package may look like SOT89-5..but it is not like that.. there is notabon the topand the pin out for this XC6371 it totally wrong..Measured and got circuit with VCC/GND pins..Above the chip there is a COIL... 2 caps IN/OUT..Pretty sure is a boost..(re-scanned..)nan.. almost bet should be an LDO..Any educated guess on datasheet is welcome..ThanksPaul

author: PKTKS
author_rank: Super Contributor
timestamp: December 18, 2021, 03:47:24 pm
content: ... there is a companion ..should be the booster.. coded SG4KHthe LDO LR1101 from UNISONIC may fit using SOT-25...SG4KH with the schottky diode marked 76...So far my guess for that...SG4KH w/diode "76" == TOREX XC6371 in SOT-25SH6GC equals LDO LR1101 in SOT-25 as well...Any guess welcomePaul

author: PKTKS
author_rank: Super Contributor
timestamp: December 18, 2021, 04:25:27 pm
content: It just can not be that TOREX chip..Pins do not match at all..Dead sure this is a booster and got it working 25VPaul

author: fzabkar
author_rank: Super Contributor
timestamp: December 18, 2021, 05:44:43 pm
content: U1-5 is the +5V supply.U1-1 is the LX output. It PWMs the coil to ground via an internal N-channel MOSFET.U1-3 must the FB voltage. If R1 and R2 are 10K and 180K, then ...FB = 25V x 10 / (180 + 10) = 1.32VIf you can measure the actual FB voltage, it might make it easier to search for the IC.I think U1 might be something like these:https://www.mouser.com/datasheet/2/115/AP5727-86067.pdfhttps://www.diodes.com/assets/Datasheets/AP1522.pdfhttp://www.ame.com.tw/datasheet/AME5145.pdfhttps://datasheet.octopart.com/AME5130AEEVADJZ-AME-datasheet-635608.pdfhttps://datasheet.octopart.com/AME5138AEEVADJZ-AME-datasheet-618832.pdfhttps://www.ti.com/lit/ds/symlink/lm2731.pdfhttps://ait-ic.com/wp-content/uploads/2021/03/A8176.pdfhttp://www.elde.cz/datasht/ts1937%20-%20Boost%20(Step-up)%20WLED%20Driver%20constant%20current.pdfhttp://www.led119.ru/_FILES_FOR_DOWNLOAD/AL8805.pdfSH6GC appears to be a step-down buck converter (with a fixed output voltage ??)1 - Vin2 - Gnd3 - Enable / Shutdown ?4 - Vout5 - LxSomething like these?https://www.mouser.com/datasheet/2/405/snvs405e-68339.pdfhttps://cdn-shop.adafruit.com/product-files/2745/P2745_Datasheet.pdfhttp://file2.dzsc.com/product/17/10/20/1129211_100606754.pdfhttps://www.ablic.com/en/doc/datasheet/switching_regulator/S8550_E.pdf

author: PKTKS
author_rank: Super Contributor
timestamp: December 20, 2021, 03:26:34 pm
content: Quote from: fzabkar on December 18, 2021, 05:44:43 pmYes right on spot 1.32V on FB pin..It does match the pinout but the marking codes are other...I would never find that candidate .. thanksthe other regulator is indeed a generic 3.3V dropped bya single diode to 2.6V..That thing feeds a FUTABA VFD.Thanks a lotPaul

author: PKTKS
author_rank: Super Contributor
timestamp: December 21, 2021, 01:07:59 pm
content: MANY MANY THANKX for your help fzabkarThat was a winner service repair...The gizmo is back to life...Paul