Electronic Components Datasheet Search |
|
EL7566AIREZ-T7 Datasheet(PDF) 11 Page - Intersil Corporation |
|
EL7566AIREZ-T7 Datasheet(HTML) 11 Page - Intersil Corporation |
11 / 14 page 11 FN7102.7 May 8, 2006 The VTJ pin reports a voltage proportional to the junction temperature. Equation 3 illustrates the relationship and can be used to accurately evaluate thermal design points. Full Start-Up Control The EL7566 offers full start-up control. The core of this control is a start-up comparator in front of the main PWM controller. The STP and STN are the inputs to the comparator, whose HI output forces the PWM comparator to skip switching cycles. The user can choose any of the following control configurations: ADJUSTABLE SOFT-START In this configuration, the ramp-up time is adjustable to any time longer than the building soft-start time of 2ms. The approximate ramp-up time, TST, is: CASCADE START-UP In this configuration, EN pin of Regulator 2 is connected to the PG pin of Regulator 1 (Figure 22). VO2 will only start after VO1 is good. LINEAR START-UP In the linear start-up tracking configuration, the regulator with lower output voltage, VO2, tracks the one with higher output voltage, VO1. OFFSET START-UP Compared with the cascade start-up, this configuration allows Regulator 2 to begin the start-up process when VO1 reaches a particular value of VREF*(1+RB/RA) before PG goes HI, where VREF is the regulator reference voltage. VREF=1.26. Component Selection INPUT CAPACITOR The main functions of the input capacitor(s) are to maintain the input voltage steady and to filter out the pulse current passing through the upper switch. The root-mean-square value of this current is: for a wide range of VIN and VO. For long-term reliability, the input capacitor or combination of capacitors must have the current rating higher than IIN,RMS. Use X5R or X7R type ceramic capacitors, or SPCAP or POSCAP types of Polymer capacitors for their high current handling capability. TJ 75 1.2 VTJ – 0.00384 ------------------------ + = TST RC VO VIN --------- ⎝⎠ ⎜⎟ ⎛⎞ = VIN STP VO - + STN 0.1µF 200K VO TST R C EL7566 FIGURE 21. ADJUSTABLE START-UP EL7566 VIN EL7566 EN PG VO2 VO1 VO2 VO1 FIGURE 22. CASCADE START-UP VIN STP VO1 - + STN C R - + VIN VO2 VO1 VO2 EL7566 EL7566 FIGURE 23. LINEAR START-UP TRACKING VIN VO1 - + VIN VO2 VREF RB RA VO1 VO2 VREF(1+RB/RA) EL7566 EL7566 FIGURE 24. OFFSET START-UP TRACKING IIN,RMS VO VIN VO – () × VIN ----------------------------------------------- IO 1/2 ≈ × I ( O) = EL7566 |
Similar Part No. - EL7566AIREZ-T7 |
|
Similar Description - EL7566AIREZ-T7 |
|
|
Link URL |
Privacy Policy |
ALLDATASHEET.NET |
Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | 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 |