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SM8207 Scheda tecnica(PDF) 2 Page - SamHop Microelectronics Corp. |
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SM8207 Scheda tecnica(HTML) 2 Page - SamHop Microelectronics Corp. |
2 / 9 page SM8207 1 2 3 6 7 8 ZCD GND VIN CS GATE VCC SOP-8 (正視) 1 ZCD 2 3 4 6 VCC 並接一個4.7uF以上, Low-ESR陶瓷電容到IC的參考地. 它僅做供給 IC內部偏壓之用,外部不可使其短路或施加任何負載. 7 透過一個外部電阻去檢測電感電流,當零電流檢測迴路檢測到電感的電 流已經到達零電流時(電感被消磁),控制器會送出一個讓Power MOSFET再導通的信號,重 新啟動MOSFET. 8 GATE CS 放一個電阻介於Power MOSFET源極端與電感器之間去檢測電感器峰值電 流,進而達到平均電流控制目的. 輸出電流去驅動一個外部的N型Power MOSFET. 串聯一只電阻到MOSFET 的閘極來限制啟動峰值電流並穫得較佳的EMI. 當輸入低於UVLO閂鎖電壓時此信號被維持 在低準位. COMP VIN 5 預留做其他功能目前無任何定義. Part Number Marking SM8207SL △xxxxxx SM8207SL Packing Method Tape & reel 2 www.samhop.com.tw Rev. 1.1 @ 2013/03 GND 線路所有的迴路皆以此做為參考點, 應儘量靠近而且線距要最短. Note: The letter “S” is marked for SOP package, and letter “L” is marked for Lead free parts. 4 5 COMP N.C 此腳位尚有針對輸入過高壓保護的功用. N.C [備註說明]: IC參考地 GND Pin)與市電或橋式整流器的地是不同,萬萬不可將其接在一起,否則會燒燬晶片. 從此端放一個電容到地作為控制補償之用以穩定迴路操作. |
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