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UC1852, UC1852J/883B, UC1854

Table of contents:
Info of UC1852
Info of UC1852J/883B
Info of UC1854

UC1852, UC1852J/883B, UC1854 Selling Leads, Datasheet

MFG:Uniden Package Cooled:TQFP-80P D/C:96+

UC1852, UC1852J/883B, UC1854 Datasheet download

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Part Number: UC1852

MFG: Uniden

Package Cooled: TQFP-80P

D/C: 96+

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UC1852 General Description

The UC1852 provides a low-cost solution to active power-factor correction (PFC) for systems that would otherwise draw high peak current pulses from AC power lines. This circuit implements zero-current switched boost conversion, producing sinusoidal input currents with a minimum of external components, while keeping peak current substantially below that of fully-discontinuous converters.

The UC1852 provides controlled switch on-time to regulate the output bulk DC voltage, an off-time defined by the boost inductor, and a zero-current sensing circuit to reactivate the switch cycle. Even though switching frequency varies with both load and instantaneous line voltage, it can be maintained within a reasonable range to minimize noise generation.

While allowing higher peak switch currents than continuous PFCs such as the UC1854, this device offers less external circuitry and smaller inductors, yet better performance and easier line-noise filtering than discontinuous current PFCs with no sacrifice in complexity or cost. The ability to obtain a power factor in excess of 0.99 makes the UC1852 an optimum choice for low-cost applications in the 50 to 500 watt power range. Protection features of these devices include under-voltage lockout, output clamping, peak-current limiting, and maximum-frequency clamping.

The UC1852 family is available in 8-pin plastic and ceramic dual in-line packages, and in the 8-pin small outline IC package (SOIC). The UC1852 is specified for operation from -55°C to +125°C, the UC2852 is specified for operation from -40°C to +85°C, and the UC3852 is specified for operation from 0°C to +70°C.

UC1852 Maximum Ratings

Supply Voltage (Low-impedance Source)...........................30.0V
Supply Current (High-impedance Source) .......................30.0mA
OUT Current, Peak.............................................................±1.0A
OUT Energy, Capacitive Load............................................ 5.0mJ
Input Voltage, ISNS ..........................................................±5.0V
Input Voltage, VFB.............................................0.3V to +10.0V
COMP Current ...............................................................±10.0mA
ISET Current..................................................................10.0mA
Power Dissipation at Ta£25°C (Note 3) ..............................1.0W
Storage Temperature ......................................65°C to +150°C
Lead Temperature (Soldering, 10 Seconds) ................... +300°C
Note 1: All voltages with respect to GND (Pin 1).
Note 2: All currents are positive into the specified terminal.
Note 3: Refers to DIL-8 Package. Consult Packaging Section of
Unitrode Integrated Circuits databook for thermal limitations and
considerations of package.

UC1852 Features

· Low-Cost Power Factor Correction
· Power Factor Greater Than 0.99
· Few External Parts Required
· Controlled On-Time Boost PWM
· Zero-Current Switching
· Limited Peak Current
· Min and Max Frequency Limits
· Starting Current Less Than 1mA
· High-Current FET Drive Output
· Under-Voltage Lockout

UC1852 Connection Diagram

UC1854 General Description

The UC1854 provides active power factor correction for power systems that otherwise would draw non-sinusoidal current from sinusoidal power lines. This device implements all the control functions necessary to build a power supply capable of optimally using available power-line current while minimizing line-current distortion. To do this, the UC1854 contains a voltage amplifier, an analog multiplier/divider, a current amplifier, and a fixed-frequency PWM. In addition, the UC1854 contains a power MOSFET compatible gate driver, 7.5V reference, line anticipator, load-enable comparator, low-supply detector, and over-current comparator.

The UC1854 uses average current-mode control to accomplish fixedfrequency current control with stability and low distortion. Unlike peak current-mode, average current control accurately maintains sinusoidal line current without slope compensation and with minimal response to noise transients.

The UC1854's high reference voltage and high oscillator amplitude minimize noise sensitivity while fast PWM elements permit chopping frequencies above 200kHz. The UC1854 can be used in single and three phase systems with line voltages that vary from 75 to 275 volts and line frequencies across the 50Hz to 400Hz range. To reduce the burden on the circuitry that supplies power to this device, the UC1854 features low starting supply current.

These devices are available packaged in 16-pin plastic and ceramic dual in-line packages, and a variety of surface-mount packages.

UC1854 Maximum Ratings

Supply Voltage V_CC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35V
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 . . . . . . . . . . . . . . . . . . . . . . .65to +150
Lead Temperature (Soldering, 10 Seconds) . . . . . . . . . . . . . . +300

UC1854 Features

· Control Boost PWM to 0.99 Power Factor
· Limit Line Current Distortion To <5%
· World-Wide Operation Without Switches
· Feed-Forward Line Regulation
· Average Current-Mode Control
· Low Noise Sensitivity
· Low Start-Up Supply Current
· Fixed-Frequency PWM Drive
· Low-Offset Analog Multiplier/Divider
· 1A Totem-Pole Gate Driver
· Precision Voltage Reference

UC1854 Typical Application

This diagram depicts a complete 250 Watt Preregulator. At full load, this preregulator will exhibit a power factor of 0.99 at any power line voltage between 80 and 260 VRMS. This same circuit can be used at higher power levels with minor modifications to the power stage. See Design Note 39B and Application Note U-134 for further details.

UC1854 Connection Diagram

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