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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However, implementations of the control functions are different. The dynamic range of the inputs can be found in the electrical characteristics table. The diode selection is based on dataxheet voltage, forward current, and switching speed. UCC employs a transconductance amplifier gM amp with gain scheduling for improved transient response refer to Figure The current profile is also different and affects the component power loss and filtering requirements.

(PDF) UCC28051 Datasheet download

Maximum Current Sense Threshold? Not recommended for new designs. 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.

All bypassing elements are connected to ground pin with shortest loops feasible.

Texas Instruments – datasheet pdf

Keep in mind that the low corner frequency of this filter may compromise the overall power factor. This also determines the crossover frequency.

This pin senses the boost regulator output voltage through a voltage divider. Design Procedure For a selected VOUT and minimum switching frequency, the following equations outline the design guidelines for power stage component selection.

Information of third parties may be subject to additional restrictions. This control method has the advantage of simple implementation and still can provide very good power factor correction. TI assumes no liability for applications assistance or customer product design. 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.


Reproduction of TI information in TI data books or data sheets is permissible only if reproduction is without alteration and is accompanied by all associated warranties, conditions, limitations, and notices. UCCDR to order quantities of 2, devices per reel. 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.

This pin senses the instantaneous boost regulator input voltage through a voltage divider. Refer to the typical application diagram for reference designators. The internal active clamp circuitry prevents the voltage from going to a negative or a high positive value. As shown in Figure 1, the switch current is compared to the reference signal output of the multiplier directly.

TI is not responsible or liable for such altered documentation.

Body dimensions do not include mold flash or protrusion, not to exceed 0. This is indirectly sensed with a secondary winding that is connected to the ZCD pin. Important Information and Disclaimer: For wide line variations, a resistor, RB, is necessary in order to permit clamping action.

Texas Instruments

This pin is the input for the zero current detect comparator. The information provided on this page represents TI’s knowledge and belief as of the date that it is provided. This drawing is subject to change without notice. TI has announced that the device will be discontinued, and a lifetime-buy period is in effect.


Products conform to specifications per the terms of Texas Instruments standard warranty. Cureent Sense to Output Delay Time? The supply voltage for the chip. The internal circuitry filters out switching noise spikes without requiring external components. The enable comparator ensures that the controller is off if the feedback sense path is broken or if the input voltage is very low.

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 clamp has the sink and source capability of 10 mA. Output of the transconductance error amplifier. This translates to a minimum switching frequency of 5 kHz. 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.

Datashest prevents further rise in output voltage. Testing and other quality control techniques are used to the extent TI deems necessary to support this warranty. This pin senses the instantaneous switch current in the boost switch and uses it as the internal ramp for PWM comparator. Customers should obtain the latest relevant dxtasheet before placing orders and should verify that such information is current and complete.

It features a transconductance voltage amplifier for feedback error processing, a simple multiplier for generating a current command proportional dataasheet the input voltage, a current-sense PWM comparator, PWM logic and a totem-pole driver for driving an external FET. The filtering requirement is not severe and therefore is not a disadvantage.

Add R suffix to device type e.

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