 |
Electronic Components Datasheet Search |
|
|
Electronic Components Datasheet Search |
|
ACT4515 Datasheet(PDF) 9 Page - Active-Semi, Inc |
|
||||||||||||||||||||||||||||||
ACT4515 Datasheet(HTML) 9 Page - Active-Semi, Inc |
|
|
9 / 16 page  ACT4515 Rev 6, 14-Nov-12 Innovative Power TM - 9 - www.active-semi.com Copyright © 2012 Active-Semi, Inc. STABILITY COMPENSATION CONT’D simple, user-programmable cable voltage drop compensation using the impedance at the FB pin. Use the curve in Figure 5 to choose the proper feedback resistance values for cable compensation. RFB1 is the high side resistor of voltage divider. In the case of high RFB1 used, the frequency compensation needs to be adjusted correspondingly. As show in Figure 7, adding a capacitor in paralled with RFB1 or increasing the compensation capacitance at COMP pin helps the system stability. Figure 6: Cable Compensation at Various Resistor Divider Values Figure 7: Frequency Compensation for High RFB1 PC Board Layout Guidance When laying out the printed circuit board, the following checklist should be used to ensure proper operation of the IC. 1) Arrange the power components to reduce the AC loop size consisting of CIN, IN pin, SW pin and the schottky diode. 2) Place input decoupling ceramic capacitor CIN as close to IN pin as possible. CIN is connected power GND with vias or short and wide path. 3) Return FB, COMP and ISET to signal GND pin, and connect the signal GND to power GND at a single point for best noise immunity. 4) Use copper plane for power GND for best heat dissipation and noise immunity. 5) Place feedback resistor close to FB pin. 6) Use short trace connecting HSB-CHSB-SW loop 7) Reduce SW Pad Size Figure 8 shows an example of PCB layout. Figure 9 and Figure 10 give two typical car charger application schematics and associated BOM list. 0.48 0.4 0.32 0.24 0.16 0.08 0 0.56 0.64 Output Current (mA) 0 250 500 750 1000 1250 1500 Delta Output Voltage vs. Output Current RF B1 = 3 00 k RFB 1 = 2 00 k RFB 1 = 150 k RFB1 = 10 0k RFB1 = 68k RFB1 = 12 k VIN = 14V V0UT = 5V IISET = 1.5A RF B1 = 2 40 k Figure 8: PCB Layout |
Similar Part No. - ACT4515 |
|
Similar Description - ACT4515 |
|
|
|
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 |
English ▼
English
Chinese
German
Japanese
Russian
Korean
Spanish
French
Italian
Portuguese
Polish
Vietnamese
Indian
Mexican
British
New Zealand
