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UC3854/5, UC38546N, UC3854A

Table of contents:
Info of UC3854/5
Info of UC38546N
Info of UC3854A

UC3854/5, UC38546N, UC3854A Selling Leads, Datasheet

MFG:2000 Package Cooled:DIP-16 D/C:UC

UC3854/5, UC38546N, UC3854A Datasheet download

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Part Number: UC3854/5

MFG: 2000

Package Cooled: DIP-16

D/C: UC

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UC3854A General Description

The UC1854A/B products are pin compatible enhanced versions of the UC1854. Like the UC1854, 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 UC1854A/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.

The UC1854A/B products improve upon the UC1854 by offering a wide bandwidth, low offset Current Amplifier, a faster responding and improved accuracy enable comparator, a VREF "good" comparator, UVLO threshold options (16/10V for offline, 10.5/10V for startup from an auxiliary 12V 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 Amp input allow the designer greater flexibility in choosing a method 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.

A 1% 7.5V reference, fixed frequency oscillator, PWM, Voltage Amplifier with softstart, line voltage feedforward (VRMS squarer), input supply voltage clamp, and over current comparator round out the list of features.

UC3854A Maximum Ratings

Supply Voltage VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22V
GT Drv Current, Continuous. . . . . . . . . . . . . . . . . . . . . . . 0.5A
GT Drv Current, 50% Duty Cycle. . . . . . . . . . . . . . . . . . . .1.5A
Input Voltage, VSENSE, VRMS . . . . . . . . . . . . . . . . . . . . . .11V
Input Voltage, ISENSE, Mult Out . . . . . . . . . . . . . . . . . . . .11V
Input Voltage, PKLMT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5V
Input Current, RSET, IAC, PKLMT, ENA . . . . . . . . . . . . . . 10mA
Power Dissipation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1W
Storage Temperature . . . . . . . . . . . . . . . . . . 65°C to +150°C
Lead Temperature (Soldering, 10 Seconds) . . . . . . . . . +300°C

UC3854A Features

· 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 (5MHz), Low Offset Current Amplifier
· Integrated Current and Voltage Amp Output Clamps
· Multiplier Improvements: Linearity,
500mV VAC Offset (eliminates external
resistor), 0-5V Multout Common Mode Range
· VREF "GOOD" Comparator
· Faster and Improved Accuracy ENABLE Comparator
· UVLO Threshold Options (16/10V / 10.5/10V)
· 300mA Startup Supply Current

UC3854A Connection Diagram

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