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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Product device recommended for new designs.

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. The resulting gM amplifer configuration is shown in Figure 3. All bypassing elements are connected to ground pin with shortest loops feasible.

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: Not recommended for new designs.

V 16 20 ICC? This pin senses the instantaneous boost regulator input voltage through a voltage divider.

Select the turns ratio so that sufficient bias voltage can be achieved at low ac line voltage. Customers are responsible for their products and applications using TI components.

The CRM converter typically uses a variation of hysteretic control with the lower boundary equal to zero current. Currents are positive into, negative out of the specified terminal.

This pin should be bypassed with a high-frequency capacitor darasheet than 0. Products conform to specifications per the terms of Texas Instruments standard warranty. The clamp has the sink and source capability of 10 mA.

The slew rate enhancement circuitry of the gM amplifier that is activated during overvoltage conditions slews the COMP pin to about 2. This is indirectly sensed with a dataheet winding that is connected to the ZCD pin. The CS pin already has an internal filter for noise due to switching transients.


This control method has the advantage of simple implementation and still can provide very good power factor correction. The dynamic range of the inputs can be found in the electrical characteristics table.

The enable comparator ensures that the controller is off if the feedback sense path is broken or if the input voltage is very low. The information provided on this page represents TI’s knowledge and belief as of the date that it is provided. The main tradeoff in ddatasheet CRM boost is lower losses due to no reverse recovery in the boost diode vs. The UCC gM amplifier also provides a full 1. Refer to the typical application diagram for reference designators.

However, implementations of the control functions are different.

It is important to choose a device that minimizes gate charge and capacitance and minimizes the sum of switching and conduction losses at a given frequency. This prevents the output dc voltage from going above 7. Where designed to be soldered at high temperatures, TI Pb-Free products are suitable for use in specified lead-free processes. Reference Design Board Layout www. The supply voltage for the chip.

Texas Instruments

In addition, an external R-C filter may be required to suppress the noise spikes. Resale of TI products or services with statements different from or beyond the parameters stated by TI for that product or service voids all express and any implied warranties for the associated TI product or service and is an unfair and deceptive business practice. This pin has a clamp at approximately 5 V.

Customers should obtain the latest relevant information before placing orders and should verify that such information is current and complete. In order to choose the compensator dynamics, determine the maximum allowable loop gain at twice the line frequency and solve for capacitor CV2.


Reproduction of TI information in TI data books or data sheets is permissible only if reproduction is without alteration and is accompanied by all associated warranties, conditions, limitations, and notices. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability. The low start-up and operating currents of the device results in low power consumption and ease of start-up.

Additional filtering at switching transient frequencies can be achieved by adding CS1. The internal circuitry filters out switching noise spikes without requiring external components.

Datasheet, PDF – Alldatasheet

Recommended operating range is 0 V to 2. Except where mandated by government requirements, testing of all parameters of each product is not necessarily performed. Production processing does not necessarily include testing of all parameters. 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. In other words, the boost inductor value should be chosen for switching frequencies greater than 5 kHz.

The chip reference ground.

Additionally, the controller provides features such as peak current limit, default timer, overvoltage protection OVP and enable. The system performance is enhanced by incorporation of zero 280051 detect function which allows the controller output to shut down at light load conditions without running into overvoltage. Internal active voltage clamps are provided to prevent this pin from going below ground or too high. TI assumes no liability for applications assistance or customer product design.