전자부품 데이터시트 검색엔진 |
|
TPS543320 데이터시트(PDF) 25 Page - Texas Instruments |
|
|
TPS543320 데이터시트(HTML) 25 Page - Texas Instruments |
25 / 43 page It is possible to use larger feedforward capacitors to further improve the transient response but take care to ensure there is a minimum of -9-dB gain margin in all operating conditions. The feedforward capacitor injects noise on the output into the FB pin. This added noise can result in increased on-time jitter at the switching node. Too little gain margin can cause a repeated wide and narrow pulse behavior. Adding a 100-Ω resistor in series with the feedforward capacitor can help reduce the impact of noise on the FB pin in case of non-ideal PCB layout. The value of this resistor must be kept small as larger values bring the feedforward pole and zero closer together degrading the phase boost the feedforward capacitor provides. When using higher ESR output capacitors, such as polymer or tantalum, their ESR zero (fESR) should be accounted for. The ESR zero can be calculated using Equation 20. If the ESR zero frequency is less than the estimated bandwidth of 1/10th the fSW, it can affect the gain margin and phase margin. A series R-C from the FB pin to ground can be used to add a pole into the control loop if necessary. All ceramic capacitors are used in this design so the effect of the ESR zero is ignored. ESR OUT ESR 1 f 2 C R u S u u (20) 8.2.1.2.13 MODE Pin The MODE resistor is set to 4.87 kΩ to select the high current limit setting, 1.0-ms soft-start and the 2 pF ramp. See Table 7-4 for the full list of the MODE pin settings. www.ti.com TPS543320 SLUSEE1 – DECEMBER 2020 Copyright © 2020 Texas Instruments Incorporated Submit Document Feedback 25 Product Folder Links: TPS543320 |
유사한 부품 번호 - TPS543320 |
|
유사한 설명 - TPS543320 |
|
|
링크 URL |
개인정보취급방침 |
ALLDATASHEET.CO.KR |
ALLDATASHEET 가 귀하에 도움이 되셨나요? [ DONATE ] |
Alldatasheet는? | 광고문의 | 운영자에게 연락하기 | 개인정보취급방침 | 링크교환 | 제조사별 검색 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 |