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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This pin has a clamp at approximately 5 V. All bypassing elements are connected to ground pin with shortest loops feasible.

TI does not warrant or represent that 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.

In addition, an external R-C filter may be required to suppress the noise spikes.

UCC Datasheet(PDF) – TI store

An external gate drive resistor may be needed to limit the peak current depending on the VCC voltage being used. Production processing does not necessarily include testing of all parameters. Not datashret for new designs.

Samples may or may not be available. This ensures that the zero power comparator is not activated during transient behavior when the slew rate enhancement circuitry is enhanced.

Internally, this pin is the inverting input to the transconductance amplifier with a nominal value of 2. In other words, the boost inductor value should be chosen for switching frequencies greater than 5 kHz. The schematic is shown in Figure 4 and the board layout for dtaasheet reference design is shown in Figure 5. Select the turns ratio so that sufficient bias voltage can be achieved at low ac line voltage.


Texas Instruments

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 82051 adjusting the switching frequency. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.

The bias capacitor must be large enough to maintain sufficient voltage with ac line variations. This pin senses the instantaneous switch current in the boost switch and uses it as the internal ramp for PWM comparator. The diode selection is based on reverse voltage, forward current, and switching speed. The low start-up and operating currents of the device results in low power consumption and ease of start-up.

TI bases its knowledge and belief on information provided by third parties, and makes no representation or warranty as to the accuracy of such information. Add a current limiting resistor, RZC, to keep the maximum current below 1 mA.

This also determines the crossover frequency. Reference Design Board Layout www.

(PDF) UCC28051 Datasheet download

ESR and the maximum RMS ripple current rating may also be important especially at higher power levels. Maximum Current Sense Threshold? Customers are responsible for their products and applications using TI components. The internal active clamp circuitry prevents the voltage from going to a negative or a high positive value. For wide line variations, a resistor, RB, is necessary in order to permit dataheet action. UCCDR to order quantities of 2, devices per reel. The dynamic range of the inputs can 20851 found in the electrical characteristics table.

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

Following are URLs where you can obtain information on other Texas Instruments products and application solutions: Highly accurate internal bandgap reference leads to tight regulation of output voltage in normal and OVP conditions, resulting in higher system reliability. This drawing is subject to change without notice. This control method has the advantage of simple implementation and still can provide very good power factor correction.


An internal rail of 7. The clamp has the sink and source capability of 10 mA.

TI is not responsible or liable for any such statements. The largest gain occurs at maximum line voltage. 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: Inductor Selection In the transition mode control, the inductor value needs to datasheeg calculated to start the next switching cycle at zero current.

All voltages are with respect to GND. Loop compensation components are connected between this pin and ground. This voltage is one of the inputs to the multiplier, with a dynamic input range of 2. The resistor value in series with the secondary winding should be chosen to limit the ZCD current to less than 10 dstasheet.

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. This pin is the input for the zero current detect comparator.