FP7171是一個(gè)開環(huán),電流模式下,控制LED驅(qū)動(dòng)IC。FP7171可編程操作在一個(gè)恒定的頻率或恒定導(dǎo)通模式。它包括一個(gè)8.5 - 100v線性調(diào)節(jié)器,使其從范圍廣泛的輸入工作電壓而不需要外部低電壓供應(yīng)。 FP7171包括PWM調(diào)光和0 - 250 mv線性調(diào)光輸入可用于LED電流的線性調(diào)光。FP7171適合巴克領(lǐng)導(dǎo)的司機(jī)。自從FP7171處于開環(huán)電流模式控制,控制器取得了良好的循環(huán)輸出電流調(diào)節(jié),

　　General Description The FP7171 is an open loop， current mode， control LED driver IC. The FP7171 can be programmed to operate in either a constant frequency or constant off-time mode. It includes an 8.5 - 450V linear regulator which allows it to work from a wide range of input voltages without the need for an external low voltage supply. The FP7171 includes a PWM dimming and 0 - 250mV linear dimming input which can be used for linear dimming of the LED current. The FP7171 is ideally suited for buck LED drivers. Since the FP7171 operates in open loop current mode control， the controller achieves good output current regulation without the need for any loop compensation. Features ? Switch mode controller for single switch LED drivers ? Enhanced drop-in replacement to the FP7171 ? Open loop peak current controller ? Internal 8.5 to 450V linear regulator ? Constant frequency or constant off-time operation ? Linear and PWM dimming capability ? Requires few external components for operation Applications ? DC/DC or AC/DC LED driver applications ? RGB backlighting LED driver ? Back lighting of flat panel displays ? General purpose constant current source ? Signage and decorative LED lighting ? Chargers Typical Application Circuit PWMD VDD LD V