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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 current profile is also different and affects the component power loss and filtering requirements. 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. It features a transconductance voltage amplifier for feedback error processing, a simple multiplier for datssheet a current command proportional to the input voltage, a current-sense PWM comparator, PWM logic and a totem-pole driver for driving an external FET.

All voltages are with respect to GND.

The supply voltage for the chip. The voltage acts as one of the inputs to the internal multiplier. The internal active clamp circuitry prevents the voltage from going to a negative or a high positive value. The clamp has the sink and source capability of 10 dagasheet.

Where designed to be soldered at high temperatures, TI Pb-Free products are suitable for use in specified lead-free processes. UCC employs a transconductance amplifier gM amp with gain scheduling for improved transient response refer to Figure This also determines the crossover frequency. This output datashee capable of delivering up to mA peak currents during turn-on and turn-off. Currents are positive into, negative out of the specified terminal.


Add R suffix to device type e. Loop compensation 2801 are connected between this pin and ground. TI and TI suppliers consider certain information to be proprietary, and thus CAS numbers and other limited information may not be available for release.

Texas Instruments – datasheet pdf

The bias capacitor must be large enough to maintain sufficient voltage with ac line variations. This drawing is subject to change without notice. Maximum Current Sense Threshold?

Further, Buyers must fully indemnify Datashret and its representatives against any damages arising out of the use of TI products in such safety-critical applications. The bias datasheeh can provide the necessary voltage.

The dynamic range of the inputs can be found in the electrical characteristics table. Select the value of CAC1 so that the corner frequency of the resulting filter is greater than the lowest switching frequency. V 16 20 ICC? Dqtasheet published by TI regarding third-party products or services does not constitute a license from TI to use such products or services or a warranty or endorsement thereof. Integral type control at low frequencies is preferred here because the loop gain varies considerably with line conditions.

The schematic is shown in Figure 4 and the board layout for the reference design is shown in Figure 5. The slew rate enhancement circuitry of the gM amplifier that is activated during overvoltage conditions slews the COMP pin to about 2.


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. 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. However, implementations of the control functions are different.

(PDF) UCC28051 Datasheet download

Products conform to specifications per the terms of Texas Instruments standard warranty. Highly accurate internal bandgap reference leads to tight regulation of output voltage in normal and OVP conditions, resulting in higher system reliability.

Enhanced slew-rate of the compensation capacitor results in a faster start-up and transient response. Except where mandated by government requirements, testing of all parameters of each product is not necessarily performed. Testing and other quality control techniques are used to the extent TI deems necessary to support this warranty.

The limited source current in the UCC helps to gradually increase catasheet error voltage on the COMP pin dtasheet a step increase in line current. TI assumes no liability for applications assistance or customer product design.

The UCC gM amplifier also provides a full 1.