6861AAQ DC TO DC IC DATASHEET DIAGRAM

6861aaq dc to dc ic

Hello In this post DISCUSSED ABOUT panel DC TO DC IC6861AAQ HOW IT WORKS . 

      Know in this topic at first start with input voltage 12v input voltage range 8v to 14v now any IC required input voltage for working as VCC Input voltage directly goes to pin no.16, 17 , 20 as ic received input then other components for safety purpose 12v input directly goes to IC . IC generate internal voltage for it self at first input 12v second step is generation of 3.3v

       Second step is generation of 3.3v. 3.3v will generate through BUCK converter circuit already make about buck circuit through buck circuit, we receive 3.3v as we recieve 3.3v without 3.3v, there will be no other voltages at first 3.3v should be generate if 3.3v not generated then check diode, inductor or your IC damaged there should be 3.3v if not, check the components in path 3.3v goes to different sections like  t-con preocessor, eeprom ic etc next step ?
       When VGL generate ? pin no. 9 of ic is enable it is enable pin for other voltages ic receive enable voltage directly from 3.3v some circuit enable voltage received for t-con ic understand the circuit if you know how it works no matter of datasheet you can trace itself other voltage will be generate after enable high there will be an sequence through soft start pin 3.3v goes to pin no. 9 for enable after enable third step DRVN There will be pulse for VGL generation flying capacitor combination of flying capacitor and two diode will generate VGL voltage around -6v Fourth step is generation of AVDDR-VAA1 is also AVDD How AVDD generate ?

       GD pin is connected to a mosfet GATE GD pin is connected to a mosfet GATE When pin no. 9 ok When pin no. 9 ok then GD pin no. 30 will work then pin no. 25 & 26 will enable switching will start on 25 & 26 pin 12v directly goes to a inductor then pass through a diode if there is no switching on 25 & 26 pin there will be around 12v on source pin of mosfet it means no switching on 25&26 there will be no voltage on test point of avdd there will be no voltage on test point of avdd because there is a switch between if there is two inductor on t-con boardit means its input is 12vif on inductor then its input is 5v one inductor for AVDD Voltage another is for 3.3v we can not use linear regulator for 12v to 3.3v because there will be more heat so we use buck converter circuit in 5v panel we can use linear regulator for 3.3v so there will be no inductor for 3.3v there will be one inductor for 5v panel for AVDD voltage generation through switching on inductor, AVDD voltage will generate it goes to source pin of mosfet out through drain pin four step complete, AVDD generated. Fifth step is generation of V-REF_G1 It is reference voltage for gamma IC It will generate on pin no. 48 of IC Then DRVP Will be enable positive charge pump will enable through flying capacitor there is double flying capacitors Dual steps for VGH generation SIX step is generation of VGH VGH voltage will generate From AVDD AVDD input from first diode after that there will be switching through flying capacitor increased voltage rectified by second diode and filtered by a capacitor again input increased voltage through third diode voltage will increased by second flying capacitor again rectified by fouth diode then filtered by a capacitor received VGH around 35v VGH input for IC for generation of VGHM, VGHM generation controlled by t-con IC

this video is credit to RAMTECH
https://www.youtube.com/channel/UCvrCuTQADAGWbe3vXyw9D2Q
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