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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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This pin is the input for the zero current detect comparator.

Further, Buyers must fully indemnify TI and its representatives against any damages arising out of the use of TI products in such safety-critical applications. In other words, the boost inductor value should be chosen for switching frequencies greater than 5 dataeheet.

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

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. TI and TI suppliers consider certain information to be proprietary, and thus CAS numbers and other limited information may not be available for release.

Recommended operating range is 0 V to 2. Transition mode control, also referred to as critical conduction mode CRM or boundary conduction mode, maintains the converter at the boundary vatasheet CCM and DCM by adjusting the switching frequency.

The UCC gM amplifier also provides a full 1. Products conform to specifications per the terms of Texas Instruments standard warranty. The enable comparator ensures that the controller is off if the feedback sense path is broken or if the input voltage is very low. For wide line variations, a resistor, RB, is necessary in order to permit clamping action.

Datasheet catalog

Efforts are underway to better integrate information from third parties. This pin senses the instantaneous boost regulator input voltage through a voltage divider. The CS pin already has an internal filter for noise due to switching transients. Currents are positive into, negative out of the specified terminal. Internally, this pin is the inverting input to the transconductance amplifier with a nominal value of 2.


CS threshold is approximately equal to: 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: Additionally, pulling this pin below the ENABLE threshold turns off the output switching, ensuring that the gate drive is held off while the boost output is pre-charging and also ensuring no runaway if feedback path is open.

It is designed for controlling a boost preregulator operating in transition mode also referred to as boundary conduction mode or critical conduction mode operation. Overvoltage Protection OVP Block The OVP feature in the part is not activated under most operating datzsheet because of the presence of the slew rate enhancement circuitry present in the error amplifier.

datasheer This voltage is one of the inputs to the multiplier, with a dynamic input range of 2. Following are URLs where you can obtain information on other Texas Instruments products and application solutions: TI assumes no liability for applications assistance or customer product design.

The diode selection is based on reverse voltage, forward current, and switching speed. This drawing is subject to change without notice.

The resistor value in series with the secondary winding should be chosen to limit the ZCD current to less than 10 mA.

An internal clamp on the multiplier output terminates the switching cycle if this pin voltage exceeds 1. The dynamic range of the inputs can be found in the electrical characteristics table. Use of such information may require a license from a third party under the patents or other intellectual property of the third party, or a license from TI under the patents or other intellectual property of TI.

This component has a RoHS exemption for either 1 lead-based flip-chip solder bumps used between the die and package, or 2 lead-based die adhesive used between the die and leadframe.


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.

Production processing does not necessarily include testing of all parameters. Keep in mind that the low corner frequency of this filter may compromise the overall power factor.

The boost inductor current is indirectly sensed through the bias winding on the boost inductor. This pin senses the instantaneous switch current in the boost switch and uses it as the internal ramp for PWM comparator. Customers should obtain the latest relevant information before placing orders and should verify that such information is current and complete. The system performance is enhanced by incorporation of zero power detect function which allows the controller output to shut down at light load conditions without running into overvoltage.

Texas Instruments

An internal rail of 7. This prevents the output dc voltage from going above 7. ESR and the maximum RMS ripple current rating may also be important especially at higher power levels. Datashet device also features innovative slew rate enhancement circuits which datsheet the large signal transient performance of the voltage error amplifier. The slew rate enhancement circuitry of the gM amplifier that is activated during overvoltage conditions slews the COMP pin to about 2.

TI is not responsible or liable for such datwsheet documentation. Enhanced slew-rate of the compensation capacitor results in a faster start-up and transient response. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.

Internal active voltage clamps are provided to prevent this pin from going below ground or too high.