SMC NCDRA1BS50-90C 在Semi公司的NCP1250是高度集成的PWM控制器，電源電壓高達28V，瞬態電流模式工作，開關電路的頻率為65kHz或100kHz，內部可調整超功率保護（OPP）電路，斜坡補償，固定4ms軟起動，220VAC時的待機功耗小于100mW的，EPS 2.0兼容，主要用在電視，機頂盒狀語從句：打印機的AC / DC轉換器，筆記本電腦和上網本的離線適配器。本文介紹了NCP1250主要特性，方框圖，解詞應用電路圖狀語從句： 40W評估板NCP1250B40WGEVB電路圖和材料清單。
NCP1250是一款高度集成的PWM控制器，能夠以纖巧的TSOP-6封裝提供堅固耐用的高性能離線電源。在28 V的電源范圍內，該控制器具有一個以峰值電流模式控制的65 kHz或100 kHz抖動開關電路。當次級側的功率開始減小時，控制器會自動將其開關頻率折回至26 kHz的水平。隨著功率的進一步下降，該器件進入跳躍周期，同時限制了峰值電流。
過載保護（OPP）是一項艱巨的任務，尤其是在空載待機要求驅動轉換器規范的情況下。ON專有的集成式OPP可使您僅通過兩個外部電阻即可控制輸出功率，而又不影響待機性能。過壓保護輸入也被組合在同一引腳上，以在光耦合器發生故障或不利的開環操作時保護整個電路。
最后，基于計時器的短路保護提供了的保護方案，無論輔助繞組和電源繞組之間的耦合是否松動，都可以使您精確地選擇保護跳變點。
NCP1250主要特性：
?固定頻率65或100 kHz電流模式控制操作
?內部和可調過功率保護（OPP）電路
?輕載條件下的頻率折返低至26 kHz并具有跳躍周期
?內部斜坡補償
?內部固定的4 ms軟啟動
?100 ms基于定時器的自動恢復短路保護
?正常和頻率折返模式下的頻率抖動
?自動恢復或閂鎖短路保護的選件?OVP
輸入可提高魯棒性
?高達28 V VCC的工作電壓
?+300 mA / ?500 mA源/宿驅動能力
?較少高線待機功率大于100 mW?
SMC NCDRA1BS50-90C
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