28051 DATASHEET PDF

UCC, UCC UCC, UCC SLUSC−SEPTEMBER − REVISED DECEMBER TRANSITION MODE PFC CONTROLLER. 1 . UCCP IC PFC CTLR TRANS-MODE 8-DIP Texas Instruments datasheet pdf data sheet FREE from Datasheet (data sheet) search for. Details, datasheet, quote on part number: UCC Part family, UCC PFC Controller for low to medium power applications requiring compliance with.

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The crossover frequency of the control loop will eatasheet much lower than twice the ac line voltage. Buyers acknowledge and agree that, if they use any non-designated products in automotive applications, TI will not be responsible for any failure to meet such requirements. Add a current limiting resistor, RZC, to keep the maximum current below 1 mA. Loop compensation components are connected between this pin and ground.

It is a variable frequency control technique that has inherently stable input current control while eliminating reverse recovery rectifier losses. During zero power or overvoltage conditions, this pin goes daasheet 2.

Important Information and Disclaimer: Recommended operating range is 0 V to 2. Body dimensions do not include mold flash or protrusion, not to exceed 0. The low start-up and operating currents of the device results in low power consumption and ease of start-up. Add Datadheet suffix to device type e.

This prevents the output dc voltage from going above 7. TI bases its knowledge and belief on information provided by third parties, and makes no representation or warranty as to the accuracy of such information.

Voltage Loop Design How well the voltage control loop is designed directly impacts line current distortion. Except where mandated by government requirements, testing of all parameters of each product is not necessarily performed.

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This translates to a minimum switching frequency of 5 kHz. Not recommended for new designs.

IC datasheet pdf-ucc,pdf datasheet (TRANSITION MODE PFC CONTROLLER)_百度文库

Information published by TI regarding third-party products or services does not constitute a license from TI to use such products or services or a warranty or endorsement thereof. Where designed to be soldered at high temperatures, TI Pb-Free products are suitable for use in specified lead-free processes.

This ensures that the zero power comparator is not activated during transient behavior when the 2805 rate enhancement circuitry is enhanced. Additional external filtering may be required.

UCC Datasheet(PDF) – TI store

An internal rail of 7. The rising edge threshold of the ZCD comparator can be as high as 2. As shown in Figure 1, the switch current is compared to the reference signal output of the multiplier directly.

Samples may or may not be available. Multiplier Block The multiplier block has two inputs. This is indirectly sensed with a secondary winding that is connected to the ZCD pin.

The diode selection is based on reverse voltage, forward current, and switching speed. This pin is the input for the zero current detect comparator. This prevents further rise in output voltage. Inductor Selection In the transition mode control, the inductor value needs to be calculated to start the next switching cycle at zero current. TI products are not authorized for use in safety-critical applications such as life support where a failure of the TI product would reasonably be expected to cause severe personal injury or death, unless officers of the parties have executed an agreement specifically governing such use.

TI is not responsible or liable for any such statements.

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Buyers datasheef and agree that any such use of TI products which TI has not designated as military-grade is solely at the Buyer’s risk, and that they are solely responsible for compliance with all legal and regulatory requirements in connection with such use.

This pin senses the instantaneous boost regulator input voltage through a voltage divider. If the power factor corrector load is dc-to-dc switching converter, the small signal model of the controller and the power factor corrector, from COMP to PFC output voltage is given by: In addition, an external R-C filter may be required datasheey suppress the noise spikes. TI’s terms “Lead-Free” or “Pb-Free” mean semiconductor products that are compatible with the current RoHS requirements for all 6 substances, including the requirement that lead not exceed 0.

All linear dimensions are in inches millimeters. Cureent Sense to Output Delay Time? The slew rate enhancement circuitry of the gM amplifier that is activated during overvoltage conditions slews the COMP pin to about 2.

Texas Instruments

Additionally, the controller provides features such as peak current limit, default timer, overvoltage protection OVP and enable. Enhanced slew-rate of the compensation capacitor results in a faster start-up and transient response.

The voltage acts as one of the inputs to the internal multiplier. The enable comparator ensures that the controller is off dxtasheet the feedback sense path is broken or if the input voltage is very low.

This output is capable of delivering up to mA peak currents during turn-on and turn-off.