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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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 280551 source current in the UCC helps to gradually increase the error voltage on the COMP pin preventing a step increase in line current.

This translates to a minimum switching frequency of 5 kHz. Output of the transconductance error amplifier.

TI does not warrant or represent that any license, either express or implied, is granted under any TI patent right, copyright, mask work right, dtasheet other TI intellectual property right relating to any combination, machine, or process in which TI products or services are used. Except where mandated by government requirements, dztasheet of all parameters of each product is not necessarily performed.

This pin senses the instantaneous boost regulator input voltage through a voltage divider.

(PDF) UCC28051 Datasheet download

Customers are responsible for their products and applications using TI components. For medium to higher power applications, where the input filter requirements dominate the datasheft of the magnetics, the CCM boost is a better choice due to lower peak currents which reduces conduction losses and lower ripple current which reduces filter requirements.

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To minimize the risks associated with customer products and applications, customers should provide adequate design datashret operating safeguards. The bias voltage should also be clamped with an external zener diode to a maximum of 18 V. TI’s terms “Lead-Free” or “Pb-Free” mean semiconductor products datashewt are compatible with the current RoHS requirements for all 6 substances, including the requirement that lead not exceed 0. The CS pin already has an internal filter for noise due to switching transients.

However, implementations of the control functions are different. The rising edge threshold of the ZCD comparator can be as high as 2. The device also features innovative slew rate enhancement circuits which improve the large signal transient performance of the voltage error amplifier. Where designed to be soldered at high temperatures, TI Pb-Free products are suitable for use in specified 82051 processes.

In addition, an external R-C filter datasehet be required to suppress the noise spikes. Select the value of CAC1 so that the corner frequency of the resulting filter is greater than the lowest switching frequency. CS threshold is approximately equal to: 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.

Internal active voltage clamps are provided to prevent this pin from going below ground or too high.

ESR and the maximum RMS ripple current rating may also be important especially at higher power levels. Additionally, pulling this dztasheet 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. Not recommended for new designs. It is a variable frequency control technique that has inherently stable input current control while eliminating reverse recovery rectifier losses.

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Texas Instruments

All voltages are with respect to GND. Loop compensation components are connected between this pin and ground. Below the UVLO threshold, the output is held low. The voltage acts as one of the inputs to the internal multiplier.

Texas Instruments – datasheet pdf

The internal active clamp circuitry prevents the voltage from going to a negative or a high positive value. All bypassing elements are connected to ground pin with shortest loops feasible. This voltage is one of the inputs to the multiplier, with a dynamic input range of 2. Products conform to specifications per the terms of Texas Instruments standard warranty. This control method has the advantage of simple implementation and still can provide very good power factor correction.

Internally, this pin is the inverting input to the transconductance amplifier with a nominal value of 2. Buyers acknowledge and agree that, if they 82051 any non-designated products in automotive applications, TI will not be responsible for any failure to meet such requirements.

The supply voltage for the chip. Body dimensions do not include mold flash or protrusion, not to exceed 0.