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cara kerja regulator STRG6707 Goldstar

MENGINTIP CARA KERJA POWER SUPLY STR S6707 PADA TV GOLDSTAR Terinspirasi oleh keluhan rekan saya forum zaenal electronic saya coba berikan sedikit ulasan mengenai cara kerja system regulator str s6707 regulataor yang saya ulas adalah kepunyaan goldstar karena tv ini lebih banyak populasinya jika dibandingkan dengan merk lain yang menggunakan jenis ic yang sama IC-STR S6707merupakan IC switching,didalamnya sudah termasuk1.Transistor poer sebagai power siwtching 2.Osilator sebagai pembangkit pulsa.3 Error corection yang mengatur lebar pulsa Transistor power pin 1=colector pin2Emitor pin 3 Basis dan output pulsa osilator adalah pin 5(drive)dan kopel kebasis Tr power switching lewat elco c825 colector Tr power dari ic STR mendapat suply tegangan sebesar 300V Pada bagian osilator mendapat suply 6,8Vpada pin 9 pada saat di ONkan (start) lewat D18>>R824>>R825 Pada saat stanby maka suply pin 9ganti diberikan Dari D810akan lewat TR Q805output tegangan stanby kurang lebih 40V ic mikom mendapat suply 5V dari 807>>Q803>>R805 Basis Q804 :high:sehingga transistor ON sementara arus mengalir dari B+>>R814>>IC TLP>>Q803>>R805 Arus ini di infokan balik ke STR sebagai informasi bahwa kondisi adalah stanby dan STR hanya bekerja setengah saja pada keadaan ON Saat di ON kan maka basis pada Q804 akan LOW sehingga transistor akan OFF Maka arus dari B+ganti akan melewati R814>>IC SE110(pin tengah)>.ground Arus akan mengalir lebih kecil di banding saaat stanby dan oleh IC TLP(photocopler)hal ini akan dinfokan balik ke ke STR,sehingga STR akan bekerja penuh tegangan 2 pada uotput travo swicthing akan naik Tegangan B+ akan naik sebesar 110V Pin 9 IC STRganti mendapat suply lewat D810 dan regulator Q805 menjadi OFF Q804 OFF>>Q805berubah menjadi OFF dan mikom ganti mendapat suply 5volt dari D805>>802 BAGAIMANA IC SE110 BEKERJA Tegangan output B+dimonitor oleh pin IC SE110N LEWAT R815fan berfungsi sebagai sensor tegangan B+,tegangan B+berubah naik,maka arus led pada photocopler yang lewat pin-3 IC SE110N ke ground akan naik,hal ini akan diinfokan balik ke IC STR,kerja IC STR akan dturunkan,dengan cara mengecilkan lebar pulsa osilator saat ON sehingga tegangan B+ akan dinaikkan kembali Perlu untuk diperhatikan dalam rangkaian ini adalah masalah umpan balik lewat photocopler jika umpan balik ini sampai terputus maka IC STR akan menganggap bahwa tegangan di B+ turun (nol),IC STR akan brusaha menaikkan tegangan B+ (yang sebenarnya tidak turun)dengan cara memperpanjang lebar pulsa ON,dan TR poer didalam dalam str akan On terlalu lama dan hal ini akan mengakibatkan IC STR rusak short Regulator Q805pada saat stanby menghantar ON dan pada saat power ON menjadi OFF(suply ganti lewat SE1100 karena itulah transistor itu disebut transistor sebagai transistor SWITCHING bersambung ke tip dan trik memperbaiki regulator str 6707 by heru setiawan
Created at 2012-07-24 05:06
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