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OnSemiNCP1014能源之星離線8WLED驅(qū)動(dòng)方案  2012/3/1

        OnSemi公司的NCP101x系列自供電單片開關(guān)電路,主要用于低待機(jī)功耗的離線開關(guān)電源(SMPS),集成了固定頻率電流模式控制器和700V MOSFET,提供實(shí)現(xiàn)可靠低成本電源所需要功能,包括軟起動(dòng),頻率抖動(dòng),短路保護(hù),跳頻,最大峰值電流設(shè)定和動(dòng)態(tài)自供電(不需要輔助線圈).主要用在小功率充電器適配器,USB,家用電器,TV等輔助電源.本文介紹NCP101x系列主要特性,方框圖, 6.5W反激轉(zhuǎn)換器和通用火線電壓輸入的7.0W轉(zhuǎn)換器以及能源之星離線8WLED驅(qū)動(dòng)器參考設(shè)計(jì)NCP1014LEDGTGEVB電路圖和材料清單(BOM).

NCP1014: Self-Supplied MonolithicSwitcher for Low Standby-PowerOffline SMPS

The NCP101X series integrates a fixed−frequency current−mode controller and a 700 V MOSFET. Housed in a PDIP−7, PDIP−7 Gull Wing, orSOT−223 package, the NCP101X offers everything needed to build a rugged and low−cost power supply, including soft−start, frequency jittering, short−circuit protection, skip−cycle, a maximum peak current setpoint and a Dynamic Self−Supply (no need for an auxiliary winding).

Unlike other monolithic solutions, the NCP101X is quiet by nature: during nominal load operation, the part switches at one of the available frequencies (65 − 100 − 130 kHz). When the current setpoint falls below a given value, e.g. the output power demand diminishes, the IC automatically enters the so−called skip−cycle mode and provides excellent efficiency at light loads. Because this occurs at typically 1/4 of the maximum peak value, no acoustic noise takes place.Asa result, standby power is reduced to the minimum without acoustic noise generation.

Short−circuit detection takes place when the feedback signal fades away, e.g. in true short−circuit conditions or in broken Optocoupler cases. External disabling is easily done either simply by pulling the feedbackpindown or latching it to ground through an inexpensive SCR for complete latched−off. Finally soft−start and frequency jittering further ease the designer task to quickly develop low−cost and robust offline power supplies.

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