uc3854bng4

產品信息

特性

controls boost pwm to near-unity power factor

limits line current distortion to <3%

world-wide operation without switches

accurate power limiting

fixed-frequency average current-mode control

high bandwidth (5 mhz), low-offset current amplifier

integrated current- and voltage-amplifier output clamps

multiplier improvements: linearity, 500 mv vac offset (eliminates external resistor), 0 v to 5 v multout common-mode range

vref good comparator

faster and improved accuracy enable comparator

uvlo options (16 v/10 v or 10.5 v/10 v)

300-µa start-up supply current

說明

the uc3854a/b products are pin compatibleenhanced versions of the uc3854. like the uc3854, these products provide all of the functions necessary for active power factor corrected preregulators. the controller achieves near unity power factor by shaping the ac input line current waveform to correspond to the ac input line voltage. to do this the uc3854a/b uses average current mode control. average current mode control maintains stable, low distortion sinusoidal line current without the need for slope compensation, unlike peak current mode control.

a 1%, 7.5-v reference, fixed frequency oscillator, pwm, voltage amplifierwith soft-start, line voltage feedforward (vrms squarer), input supply voltage clamp, and over current comparator round out the lilst of feataures.

陳偉雄 (銷售部經理)

電　　話：86 755 83643855

移動電話：13590164498

傳　　真：86 755 83643855

地　　址：中國廣東 深圳市福田區 華強電子世界三號樓二樓2a207

郵　　編：518000

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