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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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The voltage acts as one of the inputs to the internal multiplier. TI has discontinued the production of the device. The UCC is used for the datasheeet power factor corrected pre-regulator with operation over a universal input range of 85 V to V with a Vdc regulated output.

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

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. The CRM converter typically uses a variation of hysteretic control with the lower boundary equal to zero current. The largest gain occurs at maximum line voltage. Internal active voltage clamps are provided to prevent this pin from going below ground or too high.

Customers should obtain the latest relevant information before placing orders and should verify that such information is current and complete. Refer to the document for further details.

During zero power or overvoltage conditions, this pin goes below 2. The value of RS1 is thus selected for maximum power operation at low ac line voltage conditions. An internal rail of 7. Reference Design Board Layout www. This translates to a minimum switching frequency of 5 kHz. The low start-up and operating currents of the device results in low power consumption and ease of start-up.

The current profile is also different and affects the component power loss and filtering requirements. TI assumes no liability for applications assistance or customer product design. For wide line variations, a resistor, RB, is necessary in order to permit clamping action. This prevents the output dc voltage from going above 7. TI’s terms “Lead-Free” or “Pb-Free” mean semiconductor products that are compatible with the current RoHS requirements for all 6 substances, including the requirement that lead not exceed 0.


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. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.

Multiplier Block The multiplier block has two inputs.

UCC Datasheet(PDF) – TI store

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.

The UCC is suitable for applications such as electronic ballasts where there is no down-stream PWM conversion and the advantages of smaller VCC capacitor and improved transient response can be realized. Voltage Loop Design How well the voltage control loop is designed directly impacts line current distortion.

This is indirectly sensed with a secondary winding that is connected to the ZCD pin. This drawing is subject to change without notice. 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 228051 no runaway if feedback path is open.

In addition, an external R-C filter may be required to suppress the noise spikes. Reproduction of this information with alteration is an unfair and deceptive business practice. Keep in mind that the low corner datwsheet of this filter may compromise the overall power factor. The ZCD pin input goes low when the inductor current reaches zero and that transition is detected.

UCC employs a transconductance amplifier gM amp with gain scheduling for improved transient daasheet refer to Figure The chip reference ground. Efforts are underway to better integrate information from third parties.

Production processing does not necessarily include testing of all parameters. The resulting gM amplifer configuration is shown in Figure 3. It is designed for controlling a boost preregulator operating in transition mode also referred to as boundary conduction mode or critical conduction mode operation. The dynamic range of the inputs can be found in the electrical characteristics table. Body dimensions do not include mold flash or protrusion, not to exceed 0.


The internal active clamp circuitry prevents the voltage from going to a negative or a high positive value.

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. Highly accurate internal bandgap reference leads to tight regulation of output voltage in normal and OVP conditions, resulting in higher system reliability. TI and TI suppliers consider certain information to be proprietary, and thus CAS numbers and other limited information may not be available for release.

This also determines the crossover frequency.

(PDF) UCC28051 Datasheet download

An external gate drive resistor may be needed to limit the peak current depending on the VCC voltage being used. Resale of TI products or services with statements different from or beyond the parameters stated eatasheet 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.

Add a current limiting resistor, RZC, to keep the maximum current below 1 mA. Buyers acknowledge and agree that any such use of TI products which TI has not designated as military-grade is solely at the Buyer’s risk, and that they are solely responsible for compliance with all legal and regulatory requirements in connection with such use. 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.

Select the value of CAC1 so that the corner frequency of the resulting filter is greater than the lowest switching frequency. The rising edge threshold of the ZCD comparator can be as high as 2.