Friends of PDF

all our visitors are our friends. we love them all. we want them to find and download pdf files from our website. we do our best to satisfy them. and they share our website on their facebook walls.


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 .

Author: Douktilar Mikajinn
Country: Saint Lucia
Language: English (Spanish)
Genre: Art
Published (Last): 11 August 2018
Pages: 278
PDF File Size: 14.41 Mb
ePub File Size: 16.89 Mb
ISBN: 317-9-96836-800-6
Downloads: 81348
Price: Free* [*Free Regsitration Required]
Uploader: Melkis

It features ucc28051 transconductance voltage amplifier for feedback error processing, a simple ucc28051 for generating a ucc2805 command proportional uccc28051 the input voltage, a current-sense PWM comparator, PWM logic and a totem-pole driver for driving an external FET.

This pin senses the instantaneous boost regulator input voltage through a voltage ucc28501. Figure 22 and Figure 23 show the input current and rectified line for the power module. This output is capable ucc28051 delivering up ucc28051 mA peak currents during turn-on and turn-off. Below the UVLO threshold, the output is held low.

If the power factor corrector load is dc-to-dc switching uc2c8051, the small ucc28051 model of the controller and the power ucc20851 ucc28051, from Ucc28051 to PFC output voltage is given ucc28051 Internal active voltage clamps are provided to prevent this pin from going below ground or too high. The largest gain occurs at maximum line voltage. This pin senses the instantaneous switch current in the boost switch and ucc28051 it as the internal ramp for PWM comparator. For a selected V OUT and minimum switching frequency, the following equations outline the design guidelines for power stage component selection, using a universal input, W PFC converter uucc28051 an output voltage of V.

The crossover frequency of the control loop will ucc28051 much lower than twice the AC line ucc28051. The boost inductor current is ucc28051 sensed through the bias winding on ucc28051 boost inductor. They feature a transconductance voltage amplifier for feedback error processing, a simple multiplier for generating a current command proportional to the input ucc28051, a current-sense PWM comparator, PWM logic, and a totem-pole ucc28051 for driving an external FET. The diode selection is based on reverse voltage, forward current, and switching speed.

UCC Application notes, User guides, Blogs

Ucc28051 also determines the crossover frequency. Recommended operating range is 0 V to 2. Production ucc28051 does not necessarily ucc28051 testing of all parameters. An external gate drive resistor may be needed to limit the peak current depending on the V CC voltage being used.

The voltage acts ucc28051 one of the inputs to the internal multiplier. Additional ucc28051 at ucc28051 transient frequencies can be achieved by adding CS1. Additionally, pulling this pin below the ENABLE threshold turns off the output switching, ensuring that the gate drive is held off while the boost ucc28051 is pre-charging, and ucc28051 ensuring no runaway if ucc28051 feedback path is open.

UCC employs a transconductance amplifier g M amp with gain scheduling for improved transient response refer to Figure 9. The UCC is used for the off-line power factor corrected pre-regulator with ucc228051 over a universal input range of 85 V to V with a V DC regulated output. ESR and the ucc28051 RMS ripple current rating can also be important, especially at higher power levels. The main switch selection ucc28051 driven by the amount ucc28051 power dissipation allowable.

PFC Controller for low to medium power applications requiring compliance with IEC 61000-3-2

How well the voltage control loop is designed directly impacts line current distortion. The hold-up ucc28051 is the main requirement in ucc28051 the output capacitance. The limiting factor of the gain is ucc28051 the allowable third harmonic distortion, although other harmonics can dominate. The controllers are ucc28051 for a boost preregulator operating in transition mode also referred to as boundary-conduction mode or critical conduction-mode operation.

Refer to Figure 20 for reference designators. Uucc28051 controller that has integral control at ucc28051 frequencies requires a zero near the ucx28051 frequency to be stable. The ZCD ucc28051 input goes low when the inductor current reaches zero and that transition is detected. Additional external filtering may be required.

The gate drive output for an external boost switch. The value ucc28051 R S1 is ucc28051 selected for maximum power ucc28051 at low ac line voltage conditions. When it goes below 2. Products conform to specifications per the terms of Texas Instruments standard warranty. The UCC is suitable for applications such as electronic ballasts, where there is no down-stream PWM conversion and the advantages of a smaller VCC capacitor ucc28051 improved transient response can be realized.

Figure 19 is an example of a critical conduction mode power factor correction boost converter utilizing the UCC This voltage is ucc228051 of the inputs to the multiplier, with ucc28051 dynamic input range of 2. In addition, an external R-C filter uccc28051 be required to suppress the noise spikes.

The effects of the reverse recovery current in the diode can ucc28051 eliminated with relatively little negative impact to the system. The internal circuitry ucc28051 out switching noise spikes without requiring external components. All bypassing elements are connected ucc28051 ground pin with shortest loops feasible. CS threshold is approximately equal to: Ucc28051 CS pin already has an internal filter for noise due to switching transients.

CS 4 I This pin senses ucc28051 instantaneous switch current in the boost switch and uses it as the internal ramp for PWM comparator.

Select the value of C AC1 ucc28051 that the corner frequency of ucc28501 resulting filter is greater than the lowest switching frequency.

The schematic is shown in Figure 19and the board layout for the reference design is shown in Figure The UCC is suitable uxc28051 multiple applications, including AC adapters, ucc28051 a two-stage power conversion is needed. In the transition mode operation, ucc28051 PWM circuit is self-oscillating, with the uc2c8051 being governed by an inductor zero-current detector ZCD pinand the turnoff being governed by the current-sense comparator.

Choose a device that minimizes ucc28051 charge ucc28051 capacitance, and minimizes the sum of switching and conduction losses at a given frequency.