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Two-road Output Voltage Regulating Circuit of LTC1702

2015-01-06 08:25  
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Two-road Output Voltage Regulating Circuit of LTC1702
Two-road Output Voltage Regulating Circuit of LTC1702
The picture a and b are two-road output voltage regulating circuit of LTC1702.There are two independent switch power controllers in LTC1702 and each controller uses external N channel MOSFET as power switch.It uses as synchronous step-down voltage circuit of voltage feedback function and it is shown as picture (a).VD1 and C3 are charging pump circuit and it makes the power supply voltage rise.The switch frequency is set to 550 kHZ and user programmable current limiting circuit uses synchronization MOSFET switch tube VT2 as current sensitive components.But small external resistance of current sensitive resistance can not be used.The design of switch voltage regulating circuit is different from the ordinary circuit design's.LTC1702 uses accurate 25 MHZ bandwidth gain operational amplifier as feedback amplifier,which uses best loop circuit as the compensating plan.This plan can also improve loop response.