輸入是不穩定的DC6-8.4V鋰電池，輸出恒壓7V，電流小于500mA，最好電路簡潔，分立集成均可，變壓器有數據。
手頭有一個LED手提燈，前燈是12頭，后燈是18頭，所以不適合用恒流源。原先該燈用的是4V鉛酸電池，所有燈珠都并聯后串一個電阻?，F我把它改用7.2V1100mAH鋰電池，燈珠是用額定電流40mA的兩芯燈珠，2串6并和2串9并，每串串一個33歐電阻，若直接接7.2V鋰電池，6V時每串只有不到10mA，8.4V時有50余mA，外圍加恒流或穩壓電壓余量太小，想了半天只有這個方案，我本人對開關電源是外行，所以跪求哪位大哥給個線路。郵箱vchp@sina.com
DC-DC|原裝現貨|MP1410|MP1482|MP1484|MP2359|ACT4060
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MP1410:
Features
. 2A output current
. 0.22Ω internal power mosfet switch stable with low esr output ceramic capacitors
. Up to 95% efficiency
. 25μA shutdown mode
. Fixed 450khz Frequency
. Thermal shutdown
. Cycle-by-cycle Over current Protection
. Wide 4.75 to 25V operating Input range
. Output Adjustalble from 1.22v to 21v
MP1482:
Features
. 2A output current
. 0.22Ω internal power mosfet switch stable with low esr output ceramic capacitors
. Wide 4.75 to 23V operating Input range
. Up to 95% efficiency
. Programmable Soft-Start
. Stable with low Esr ceramic output capacitors
. Fixed 400khz Frequency
. Cycle-by-cycle Over current Protection
. Thermally Enhanced 8-pin SOIC Pakage
MP1484:
Features
. 3A output current
. Wide 4.75 to 23V operating Input range
. Integrated 100mΩ power mosfet switches
. Up to 95% efficiency
. Fixed 400khz Frequency
. Cycle-by-cycle Over current Protection
. Output Adjustalble from 0.952v to 20v
.Input under voltage lockout
.Thermally Enhanced 8-pin Soic package
. Programmable Soft-start
. Stable with low Esr ceramic output capacitors
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