UC2854BMDWREPG4

增强型产品高级高功率因数前置稳压器 16-SOIC -55 to 125

PFC IC Average Current 80kHz ~ 120kHz 16-SOIC

得捷:
IC PFC CTR AVERAGE 120KHZ 16SOIC

艾睿:
Power Factor Correction PREREGUL 0.3mA 115KHz 16-Pin SOIC T/R

安富利:
The UC2854B products are pin compatible enhanced versions of the UC2854. Like the UC2854, theseproducts 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 tocorrespond to the ac-input line voltage. To do this the UC2854B uses average current mode control.Average current mode control maintains stable, low distortion sinusoidal line current without theneed for slope compensation, unlike peak current mode control.A 1% 7.5-V reference, fixed frequency oscillator, PWM, voltage amplifier with soft-start, linevoltage feedforward VRMS squarer, input supply voltage clamp, and over currentcomparator round out the list of features.The UC2854B is available in a DW SOIC-Wide package.The UC2854A/B products improve upon the UC2854 by offering a wide bandwidth, low offset currentamplifier, a faster responding and improved accuracy enable comparator, a VREF GOOD comparator,UVLO threshold options 16 V/10 V for offline, 10.5 V/10 V for startup from an auxiliary 12-Vregulator, lower startup supply current, and an enhanced multiply/divide circuit. New featureslike the amplifier output clamps, improved amplifier current sinking capability, and low offsetVAC pin reduce the external component count while improving performance. Improved common modeinput range of the multiplier output/current amplifier input allow the designer greater flexibilityin choosing a method for current sensing. Unlike its predecessor, RSET controls onlyoscillator charging current and has no effect on clamping the maximum multiplier output current.This current is now clamped to a maximum of 2 × IAC at all times which simplifiesthe design process and provides foldback power limiting during brownout and extreme low lineconditions.

Chip1Stop:
Power Factor Correction PREREGUL 0.3mA 115KHz 16-Pin SOIC T/R

Verical:
Power Factor Correction Preregulator 0.3mA 115kHz 16-Pin SOIC T/R