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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RS2 and RS3 can be added for further scaling. All bypassing elements are connected to ground pin with shortest loops feasible.

Output of the transconductance error amplifier. Efforts are underway to better integrate information from third parties. The CS pin already has an internal filter for noise due to switching transients. The clamp has the sink and source capability of 10 mA.

This pin senses the instantaneous boost regulator input voltage through a voltage divider. In addition to generating a 2. The supply voltage for the chip. 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.

Where designed to be soldered at high temperatures, TI Pb-Free products are suitable for use in specified lead-free processes.

Except where mandated by government requirements, testing of all parameters of each product is not necessarily performed. For wide line variations, a resistor, RB, is necessary in order to permit clamping action. The limited 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. The advantage in using a transconductance amplifier is dqtasheet 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.


Cureent Sense to Output Delay Time? Inductor Selection In the transition mode control, the inductor value needs to be calculated to start the next switching cycle at zero current.

(PDF) UCC28051 Datasheet download

The schematic is shown in Figure 4 and the board layout for the reference design is shown in Figure 5. In other words, the boost inductor value should be chosen for switching frequencies greater than 5 kHz.

UCCDR to order quantities of 2, devices per reel. It features 228051 transconductance voltage amplifier for feedback error processing, a simple multiplier for generating 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.

Texas Instruments – datasheet pdf

The UCC is suitable for multiple applications including AC adapters where a two-stage power conversion is needed. Keep in mind that the low corner frequency of this filter may compromise the overall power factor. 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. Internally, this pin is the inverting input to the transconductance amplifier with a nominal value of 2.

The bias datasheeet should also be clamped with an external zener diode to daatasheet maximum of 18 V.


V 16 20 ICC? This voltage is one of the inputs to the multiplier, with 28015 dynamic input range of 2. This pin senses the instantaneous switch current in the boost switch and uses it as the internal ramp for PWM comparator.

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

Enhanced slew-rate of the compensation capacitor results in a faster start-up and transient response.

Exposure to absolute-maximum-rated conditions for catasheet periods may affect device reliability. Additional filtering at switching transient frequencies can be achieved by adding CS1. TI assumes no liability for applications assistance or customer product design. Transition mode control, also referred to as critical conduction mode CRM or boundary conduction fatasheet, maintains the datasheft at the boundary between CCM and DCM by adjusting the switching frequency.

Multiplier Block The multiplier block has two inputs.

CS threshold is approximately equal to: The information provided on this page represents TI’s knowledge and belief as of the date that it is provided. TI bases its knowledge and belief on information provided by third parties, and makes no representation or datashete as to the accuracy of such information.

Additional external filtering may be required.