Electronic Components Datasheet Search |
|
UCC28513DW Datasheet(PDF) 19 Page - Texas Instruments |
|
|
UCC28513DW Datasheet(HTML) 19 Page - Texas Instruments |
19 / 39 page UCC28510, UCC28511, UCC28512, UCC28513, UCC28514, UCC28515, UCC28516, UCC28517 SLUS517B − DECEMBER 2002 − REVISED AUGUST 2004 19 www.ti.com APPLICATION INFORMATION The current sense resistor for the PWM stage, R5, is selected so that at maximum current, its voltage is the threshold voltage of the peak current comparator (nominally 1.3 V). R5 + V TH PWM stage I LIMIT i Q2(peak) In many cases, an input line filter will be necessary in order to meet the requirements of an agency or application. The input line filter design has been omitted from this procedure due to the vast array of requirements and circumstances. We urge you to refer to Reference [11] for details. PFC stage control The PFC stage is designed in a three-step process. First, set the dynamic range of the multiplier, second, stabilize the average current control loop and third, stabilize the voltage loop that controls the energy storage capacitor voltage. Use as much of the dynamic range of the multiplier as possible. The current control loop must have wide bandwidth in order to follow the instantaneous rectified line voltage. The voltage loop must be slower than twice the ac line frequency so that it will not compromise the power factor. multiplier The dynamic range of the multiplier is a function of the currents and/or voltages of the IAC, VAOUT and VFF pins. Coordinate the selection process to use the full range of the multiplier and obtain the desired power limiting features. Select the components R1 and R15 to use the iIAC(t) range and the VVFF range under the condition that the maximum of the VVAOUT range, described in equation 11. The selection process is similar to the selection process for UC3854, except for the VFF voltage and MOUT current limitations.[12] In this product series, the divide-by-square function is internally implemented so that it divides by the greater of 1.4 V or VVFF. If the 1.4-V level controls the divider, power factor correction may still occur if the VAOUT level is within the functioning range of the multiplier. Power factor correction occurs during that condition because the multiplier section functions as a two-input multiplier, rather than a three-input multiplier. Notice that the voltage at the VFF pin will be proportional to the average of the IAC current. Typically, VVFF=1.4 V at low ac line voltage is set as the design boundary; the upper boundary of VVFF will remain within the range if the functional ac line voltage range varies by less than 4.3:1. 0 v i IAC (t) v 500 mA, 0 v V VAOUT (t) v 5V, 1.4 V v V VFF v VVREF * 1.4 V (10) (11) |
Similar Part No. - UCC28513DW |
|
Similar Description - UCC28513DW |
|
|
Link URL |
Privacy Policy |
ALLDATASHEET.COM |
Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Datasheet Upload | Contact us | Privacy Policy | Link Exchange | Manufacturer List All Rights Reserved©Alldatasheet.com |
Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
Family Site : ic2ic.com |
icmetro.com |