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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During zero power or overvoltage conditions, this pin goes below 2. This is indirectly sensed with a secondary winding that is connected to the ZCD pin. It features a transconductance voltage amplifier for feedback error processing, a simple multiplier for generating a current command proportional to the input voltage, a current-sense PWM comparator, PWM logic and a totem-pole driver for driving an external FET.

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Texas Instruments

This datashdet is capable of delivering up to mA peak currents during turn-on and turn-off. In other words, the boost inductor value should be chosen for switching frequencies greater than 5 kHz.

Device has been announced but is not in production. The bias winding can provide the necessary voltage. The current profile is also different and affects the component power loss and filtering requirements. Not recommended for new designs. It is designed for controlling a boost preregulator dafasheet in transition mode also referred to as boundary conduction mode or critical conduction mode operation. RS2 and RS3 can be added for further scaling.

The largest gain occurs at maximum line voltage. To minimize the risks datqsheet with customer products and applications, customers should provide adequate design and operating safeguards. Samples may or may not be available. The boost inductor current is indirectly sensed through the bias winding on the boost inductor. This pin should be bypassed with a high-frequency capacitor greater than 0.

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

The dynamic range of the inputs can be found in the electrical characteristics table. Recommended operating range is 0 V to 2. This drawing is subject to change without notice. TI has discontinued the production of the device.


Additionally, the controller provides features such as peak current limit, default timer, overvoltage protection OVP and enable. 28501 where mandated by government requirements, testing of all parameters of each product is not necessarily performed.

Output of the transconductance error amplifier. The UCC and UCC, while being pin compatible with other industry controllers providing similar functionality, offer many feature enhancements and tighter specifications, leading to an overall reduction in system implementation cost. Efforts are underway to better integrate information from third parties. In order to choose the compensator dynamics, determine the maximum allowable loop gain at twice the line frequency and solve for capacitor CV2.

Customers are responsible for their products and applications using TI components. Where designed to be soldered at high temperatures, TI Pb-Free products are suitable for use in specified lead-free processes. This datasheeet that the zero power comparator is not activated during transient behavior when the slew rate enhancement circuitry is enhanced. This pin has a clamp at approximately 5 V.

The ZCD pin input goes low when the inductor current reaches zero and that transition is detected. Customers should obtain the latest relevant information before placing orders and should verify that such information is current and complete.

Device is in production to support existing customers, but TI does not recommend using this part in a new design. The CRM converter typically uses a variation of hysteretic control with the lower boundary equal to zero current.

It is a variable frequency control technique that has inherently stable input current control while eliminating reverse recovery rectifier losses. Transition Mode Control The boost converter, datashedt most common topology used for power factor correction, can operate in two modes — continuous conduction code CCM and discontinuous conduction mode DCM. Internal active voltage clamps are provided to prevent this pin datasheef going below ground datashheet too high.

This pin senses the boost regulator output voltage through a voltage divider. Select the value of CAC1 so that the corner frequency of the resulting filter is greater than the lowest switching frequency. Buyers represent that they have all necessary expertise in the safety and regulatory ramifications of their applications, and acknowledge and agree that they are solely responsible for all legal, regulatory and safety-related requirements concerning their products and any use of TI products in such safety-critical applications, notwithstanding any applications-related information or support that may be provided by TI.


Additional external filtering may be required. For wide line variations, a resistor, RB, is necessary in order to permit clamping action. The internal circuitry filters out switching noise spikes without requiring external components. The multiplier output is approximately 0.

Reproduction of TI information in TI data books or data sheets is permissible only if reproduction is dataasheet alteration and is accompanied by all associated warranties, conditions, limitations, datqsheet notices. Use of such information may require a license from a third party under the datasueet or other intellectual datasheft of the third party, or a license from TI under the patents or other intellectual property of TI.

TI is not responsible or liable for any such statements. Products conform to specifications per the terms of Texas Instruments standard warranty.

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. The crossover frequency of the control loop will be much lower than twice the ac line voltage.

Internally, this pin is the inverting input to the transconductance amplifier with a nominal value of 2. This pin senses the instantaneous boost regulator input voltage through a voltage divider. The voltage acts as one of the inputs to the internal multiplier.