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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Products conform to specifications per the terms of Texas Instruments standard warranty. 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. Output of the transconductance error amplifier. Additionally, the controller provides features such as peak current limit, default timer, overvoltage protection OVP and enable.
It is designed for controlling a boost preregulator operating in transition mode also referred to as boundary conduction mode or critical conduction mode operation. Be sure to connect a 0. Voltage Loop Design How well the voltage control loop is designed directly impacts line 228051 distortion. This also determines the crossover frequency. All voltages are with respect to GND.

Transition Mode Control The boost converter, the most common topology used for power factor correction, can operate in two modes — continuous conduction code CCM and discontinuous conduction mode DCM. 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. Following are URLs where you can obtain information on other Texas Instruments products and application solutions: The gate drive output for an external boost switch.
Internal active voltage clamps are provided to prevent this pin from going below ground or too high. Important Information and Disclaimer: Refer to the typical application diagram for reference designators. To minimize the risks associated with customer products and applications, customers should provide adequate design and operating safeguards. This pin senses the boost regulator output voltage through a voltage divider.
The resulting gM amplifer configuration is shown in Figure 3. Maximum Current Sense Threshold? V 16 20 ICC? 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.
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The internal active clamp circuitry prevents the voltage from going to a negative or a high positive value. Reference Design Board Layout www. TI datashete not responsible or liable for such altered documentation. Design Procedure For a selected VOUT and minimum switching frequency, the following equations outline the design guidelines for power stage component selection.
The crossover frequency of the control loop will be much lower than twice the ac line voltage. All bypassing elements are connected to ground pin with datashdet loops feasible.
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An internal clamp on the multiplier output terminates the switching cycle if this pin voltage exceeds 1.
TI has discontinued the production of the device. It is a variable frequency control technique that has inherently stable input current control while eliminating reverse recovery rectifier losses. RS2 and RS3 can be added for further scaling. Darasheet ensures that the zero power comparator is not activated during transient behavior when the slew rate enhancement circuitry is enhanced.
Testing and other quality control techniques are used to the extent TI deems necessary to support this warranty. TI assumes no liability for applications assistance or customer product design. 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. Reproduction of this information with alteration is an unfair and deceptive business practice.
Recommended operating range is 0 V to 2. All linear dimensions are in inches millimeters. In addition to generating a 2. Select the turns ratio so that sufficient bias voltage can be achieved at low ac line voltage. The bias winding can provide the necessary voltage. 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.
Reproduction of TI information in Datzsheet data books or data sheets is permissible only if reproduction is without alteration and is accompanied by all associated warranties, conditions, limitations, and notices. The ZCD pin input goes low when the inductor current reaches zero and that transition is detected.
Customers are responsible for their products and applications datashheet TI components. Customers should obtain the latest relevant information before placing orders and should verify that such information is current and complete.
This pin is the input for the zero current detect comparator.
Overvoltage Protection OVP Block The OVP feature in the part is not activated under most operating conditions because of the presence of the slew rate enhancement circuitry present in the error amplifier. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
