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UC3854A

UCx854 High-Power Factor Preregulator

1Features 1?ControlBoostPWMto0.99PowerFactor ?LimitLine-CurrentDistortionto

UC3854A

具有 16V/10V UVLO、適用于 50Hz 至 400Hz 線路頻率、溫度范圍為 0°C 至 70°C 的增強(qiáng)型雙極性 CCM PFC 控制器; ? Controls Boost PWM to Near-Unity Power Factor\n? Limits Line Current Distortion To AC Offset (Eliminates External Resistor), 0 V to 5 V Multout Common-Mode Range\n? VREF GOOD Comparator\n? Faster and Improved Accuracy ENABLE Comparator \n? UVLO Options (16 V/10 V or 10.5 V/10 V)\n? 300-μA Start-Up Supply Current;

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. Available in the 16-pin N (PDIP), DW (SOIC Wide), and J (CDIP) and 20-pin Q (PLCC) package. See Ordering Information table for availability by temperature range.The UC3854A/B products improve upon the UC3854 by offering a wide bandwidth, low offset current amplifier, 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-V regulator), lower startup supply current, and an enhanced multiply/divide circuit. New features like the amplifier output clamps, improved amplifier current sinking capability, and low offset VAC pin reduce the external component count while improving performance. Improved common mode input range of the multiplier output/current amplifier input allow the designer greater flexibility in choosing amethod for current sensing. Unlike its predecessor, RSET controls only oscillator 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 simplifies the design process and provides foldback power limiting during brownout and extreme low line conditions.

UC3854A

Enhanced High Power Factor Preregulator

UC3854A

ADVANCED HIGH-POWER FACTOR PREREGULATOR

UC3854A

ADVANCED HIGH-POWER FACTOR PREREGULATOR

UC3854A

ADVANCED HIGH-POWER FACTOR PREREGULATOR

UC3854A/B

ADVANCED PFC/PWW COMBINATION CONTROLLER WITH TRAILING-EDGE/TRAILING-EDGE MODULATION

UC3854ADW

ADVANCED HIGH-POWER FACTOR PREREGULATOR

UC3854ADW

ADVANCED HIGH-POWER FACTOR PREREGULATOR

UC3854ADW

ADVANCED HIGH-POWER FACTOR PREREGULATOR