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UC2851N, UC2852, UC285-2

Table of contents:
Info of UC2851N
Info of UC2852
Info of UC285-2

UC2851N, UC2852, UC285-2 Selling Leads, Datasheet

MFG:Texas Instruments Category:Integrated Circuits (ICs) Package Cooled:18-DIP D/C:08+/09+

UC2851N, UC2852, UC285-2 Datasheet download

Five Points

Part Number: UC2851N

Category: Integrated Circuits (ICs)

MFG: Texas Instruments

Package Cooled: 18-DIP

D/C: 08+/09+

Description: IC PROG OFF-LINE PWM CONT 18-DIP

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UC2851N Parameters

Technical/Catalog Information	UC2851N
Vendor	Texas Instruments
Category	Integrated Circuits (ICs)
PWM Type	Current Mode
Number of Outputs	1
Package / Case	18-DIP (300 mil)
Packaging	Tube
Duty Cycle	50%
Voltage - Supply	8 V ~ 32 V
Frequency-Max	500kHz
Buck	Yes
Boost	Yes
Flyback	Yes
Inverting	No
Doubler	No
Divider	No
Cuk	No
Isolated	No
Drawing Number	296; 4040049; N; 14, 16, 18, 20
Operating Temperature	-40°C ~ 85°C
Lead Free Status	Lead Free
RoHS Status	RoHS Compliant
Other Names	UC2851N UC2851N 296 11192 5 ND 296111925ND 296-11192-5

UC2852 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 -55to +125, the UC2852 is specified for operation from -40 to +85, and the UC3852 is specified for operation from 0to +70.

UC2852 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............................................. 5.0J
Input Voltage, ISNS ..........................................................±5.0V
Input Voltage, VFB........................................... 0.3V to +10.0V
COMP Current ..............................................................±10.0mA
ISET Current.................................................................10.0mA
Power Dissipation at Ta25 (Note 3) .............................1.0W
Storage Temperature ........................................-65 to +150
Lead Temperature (Soldering, 10 Seconds) ................... +300

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.

UC2852 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

UC2852 Connection Diagram

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