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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TI assumes no liability for applications assistance or customer product design. UCC employs a transconductance amplifier gM amp with gain scheduling for improved transient response refer to Figure Add R suffix to device type e. The supply voltage for the chip. The resistor value in 228051 with the secondary winding should be chosen to limit the ZCD current to less than 10 mA. Recommended operating range is 0 V to 2.

In addition, an external R-C filter may be required to suppress the noise spikes. The dxtasheet gM amplifer configuration is shown in Figure 3.

Datasheet, PDF – Alldatasheet

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.

This ensures that the zero power comparator is not activated during transient behavior when the slew rate enhancement circuitry is enhanced. All voltages are with respect to GND.

The current profile is also different and affects the component eatasheet loss and filtering requirements. Device has been announced but is not in production. The clamp has the sink and source capability of 10 mA. Important Information and Disclaimer: This translates to a minimum switching frequency of 5 kHz.

(PDF) UCC28051 Datasheet download

Maximum Current Sense Threshold? The schematic is shown in Figure 4 and the board layout for the reference design is shown in Figure 5. Following are URLs where you can obtain information on other Texas Instruments products and application solutions: Products 28501 to specifications per the terms of Texas Instruments standard warranty.


The internal circuitry filters out switching noise spikes without requiring external components. The advantage in using a transconductance amplifier is that the inverting input of the amplifier is solely determined by the external resistive-divider from the output voltage and not the transient behavior of the amplifier itself.

The ZCD pin input goes low when the inductor current reaches zero and datasheett transition is detected. An internal rail of 7. This datsaheet has a clamp at approximately 5 V. 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. The UCC gM amplifier also provides a full 1. The internal datashee clamp circuitry prevents the voltage from going to a datashest or a high 280551 value.

Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability. TI does not warrant or represent that any license, either express or datzsheet, 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.

The rising edge threshold of the ZCD comparator can be as high as 2. CS threshold is approximately equal to: Information of third parties may be subject to additional restrictions. The device also features innovative slew rate enhancement circuits which improve the large signal transient performance of the voltage error amplifier.

During zero power or overvoltage conditions, this pin goes below 2. The chip reference ground. The crossover frequency of the control loop will be much lower than twice the ac line voltage.

The enable comparator ensures that the controller is off if the feedback sense path is broken or if the input voltage is very low. The filtering requirement is not severe and therefore is not a disadvantage. Add a current limiting resistor, RZC, to keep the maximum current below 1 mA.


ESR and the maximum RMS ripple current rating may also be important especially at higher power levels. 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.

Product device recommended for new designs. Refer to the typical application diagram for reference designators. 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. Refer to the document for further details.

Texas Instruments

Currents are positive into, negative out of the specified terminal. Output of the transconductance error amplifier. This voltage is one of the inputs to the multiplier, with a dynamic input range of 2. The CS pin already has an internal filter for noise due to switching transients.

Integral type control at low frequencies is preferred here because the loop gain varies considerably with line conditions. Transition mode control, also referred to as critical conduction mode CRM or boundary conduction mode, maintains the converter at the boundary between CCM and DCM by adjusting the switching frequency.

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. Testing and other quality control techniques are used to the extent TI deems necessary to support this warranty.