Texas Instruments UCC Series Power Factor Correction – PFC are available at Mouser Electronics. Mouser offers inventory, pricing, & datasheets for . Texas Instruments UCC PMIC – PFC (Power Factor Correction) parts available at DigiKey. UCC, UCC UCC, UCC SLUSC−SEPTEMBER − REVISED DECEMBER TRANSITION MODE PFC CONTROLLER. 1 .
|Published (Last):||5 May 2009|
|PDF File Size:||18.68 Mb|
|ePub File Size:||14.30 Mb|
|Price:||Free* [*Free Regsitration Required]|
This pin ucc28051 the instantaneous switch current in the boost switch and uses it as the internal ramp for PWM comparator. Integral type control ucc28051 low frequencies is preferred, because the loop gain varies considerably with line conditions.
The internal circuitry filters out switching noise spikes without requiring ucc28051 components.
The chip reference ucc28051. The controllers are designed for a boost preregulator operating in transition mode also referred to as boundary-conduction mode ucc28051 critical conduction-mode operation. Additional filtering at switching transient frequencies can be achieved by adding CS1.
During zero power or overvoltage conditions, this pin goes below 2. Additionally, the controller ucc28051 features such as peak current limit, default timer, OVP, and enable. Ucc28051 largest gain occurs at maximum line voltage. The CS pin already has an internal filter for noise due ucc28051 switching transients.
The diode selection is based ucc28051 reverse voltage, forward current, and switching speed. When it goes below 2. It ucc28051 a transconductance voltage amplifier for feedback error processing, ucc28051 simple multiplier ucc28051 generating a ucc8051 command proportional to the input voltage, a current-sense PWM comparator, PWM logic and a totem-pole ucc280511 for driving an external FET.
Additionally, pulling this pin 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 ucc28051 feedback path is open. Figure 19 is an example of a critical conduction mode power factor correction boost converter utilizing the UCC Information in the following applications ucc28051 is not part of the TI component specification, and TI does not warrant its accuracy or completeness.
The current sense resistor value ucc28051 be chosen to limit the output power, and it must also use the full ucc28051 range of the multiplier during normal steady ucc28051 operation. In addition, an external R-C filter may be required to ucc28051 the noise spikes. Products conform to specifications per the terms of Texas Instruments standard warranty. This voltage is one of the inputs to the multiplier, with a ucc28051 input range of 2.
It is designed for controlling a ucc28051 preregulator operating in transition ucc288051 also referred to as boundary conduction mode or critical conduction mode operation. Ucc28051 ZCD pin input goes ucc28051 when the inductor current ucc28051 zero and that transition is detected. In the transition mode control, the inductor value must be calculated to start the next switching cycle at zero current. Internally, this pin is the inverting input to the transconductance amplifier with a nominal value of 2.
The voltage acts as one of the inputs ucc28051 the internal multiplier.
Secondly, the ucc28051 amplifier source current for UCC is typically 1. This pin senses the instantaneous boost regulator input voltage through a voltage divider. CS threshold is ucc28051 equal to: For a selected V OUT and minimum ucx28051 frequency, the following equations outline the design guidelines for ucc28051 stage component selection, using a universal input, W PFC converter with an output voltage of V. How well the voltage control loop is ucc28051 directly impacts line current distortion.
UCC Application notes, User guides, Blogs
The crossover frequency of the ucc28051 loop will be much lower than twice the AC line voltage. Choose a device that minimizes gate charge and capacitance, and minimizes the sum of switching and conduction losses at a given frequency.
Figure 22 and Ucc28051 23 show the input ucc28051 and rectified line for the power module. Input for the zero current detect comparator.
This pin senses the boost regulator output voltage ucc28051 a voltage divider. The ucc28051 voltage for the chip. An internal clamp on the multiplier output terminates the switching cycle if this pin voltage ucc28051 1.
Серия UCC (Texas Instruments)
L determines the frequency range of the converter. This also determines the crossover frequency. Recommended operating range ucc28051 0 V to 2. CS 4 I This pin ucc28051 the ucc28051 switch current in the boost switch and uses it as the internal ramp for PWM comparator.