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 resulting gM amplifer configuration is shown in Figure 3. This pin should be bypassed with a high-frequency capacitor greater than 0. This prevents further rise in output voltage. The clamp has the sink and source capability of 10 mA.

This output is capable of delivering up to mA peak currents xatasheet turn-on and turn-off. All voltages are with respect to GND. The gate drive output for an external boost switch.

This pin senses the instantaneous boost regulator input voltage through a voltage divider. The UCC gM amplifier also provides a full 1. 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.

It is dattasheet variable frequency control technique that has inherently stable input current control dagasheet eliminating reverse recovery rectifier losses. 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: Important Information and Disclaimer: The device also features innovative slew rate enhancement circuits which improve the large signal transient performance of the voltage error amplifier.

(PDF) UCC Datasheet PDF Download – UCCx UCCx Transition Mode PFC Controller (Rev. G)

Except where mandated by government requirements, testing of all parameters of each product is not necessarily performed. An internal rail of 7. Following are URLs where you can obtain information on other Texas Instruments products and application solutions: Internally, this pin is the inverting input to the transconductance amplifier with a nominal value of 2.


Recommended operating range is 0 V to 2. Customers are responsible for their products and applications using TI components. TI assumes no liability for applications assistance or customer datzsheet design.

The UCC is used for the off-line power factor corrected pre-regulator with operation over a universal input range of 85 V to V with a Vdc regulated output. 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.

RS2 and Datawheet can be added for further scaling. 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. 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.

This prevents the output dc voltage from going above 7.

The low start-up and operating currents of the device results in low power consumption and ease of start-up. Production processing does not necessarily include testing datasjeet all parameters. The voltage acts as one of the inputs to the internal multiplier.

The ZCD pin input goes low when the inductor current reaches zero and that transition is detected. V 16 20 ICC? Product device recommended for new designs. Output of the transconductance error amplifier. Voltage Loop Design How well the voltage control loop is designed directly impacts line current distortion.

Texas Instruments

Internal active voltage clamps are provided to prevent this pin from going below ground or too high. TI does not warrant or represent datzsheet any license, either express or implied, is granted under any TI patent right, copyright, mask work right, or other TI intellectual property right relating to any combination, machine, or process in which TI products or services are used.


This is indirectly sensed with a secondary winding that is connected to the ZCD pin. In order to choose the compensator dynamics, determine the maximum allowable loop gain at twice the line frequency and datasheeg for capacitor CV2. Additionally, the controller provides features such as peak current limit, default timer, overvoltage protection OVP and enable. Information of third parties may be subject to additional restrictions.

The filtering requirement is not severe and therefore is not a disadvantage. The schematic is shown in Figure 4 and the board layout for the reference design is shown in Figure 5. In addition to generating a 2.

Add a current limiting resistor, RZC, to keep the maximum current below 1 mA. The multiplier output is approximately 0. Additional external filtering may be required. In other words, the boost inductor value should be chosen for switching frequencies greater than 5 kHz.

The rising edge threshold of the ZCD comparator can be as high as 2.

Datasheet catalog

The slew rate enhancement circuitry of the gM amplifier that is activated during overvoltage conditions slews the COMP pin to about 2.

The largest gain occurs at maximum line voltage. Add R suffix dwtasheet device type e. Select the turns ratio so that sufficient bias voltage can be achieved at low ac line voltage.