 |
전자부품 데이터시트 검색엔진 |
|
|
전자부품 데이터시트 검색엔진 |
|
L6207 데이터시트(PDF) 6 Page - STMicroelectronics |
|
||||||||||||||||||||||||||||||
L6207 데이터시트(HTML) 6 Page - STMicroelectronics |
|
|
6 / 53 page  AN1762 APPLICATION NOTE 6/53 Figure 6 shows the voltage waveforms at the two OUT pins referring to a possible practical situation, with a peak output current of 2.8A, VS = 52V, RSENSE = 0.33Ω, TJ = 25°C (approximately) and a good PCB layout. Below ground spike amplitude is -2.65V for one output; the other OUT pin is at about 57V. In these conditions, total differential voltage reaches almost 60V, which is the absolute maximum rating for the DMOS. Keeping differen- tial voltage between two Output pins belonging to the same Full Bridge within rated values is a must that can be accomplished with proper selection of Bulk capacitor value and equivalent series resistance (ESR), accord- ing to current peaks and chopping style and adopting good layout practices to minimize PCB parasitic induc- tances (see below) [3]. Figure 6. Voltage at the two outputs during the dead time at a phase change. 3.3 Choosing the Bulk Capacitor Since the bulk capacitor, placed between VS and GND pins, is charged and discharged during IC operation, its AC current capability must be greater than the r.m.s. value of the charge/discharge current. In the case of a PWM current regulation, the current flows from the capacitor to the IC during the on-time (tON) and from the IC (implementing a fast decay current recirculation technique) or from the power supply (implementing a slow de- cay current recirculation technique) to the capacitor during the off-time (tOFF). The r.m.s. value of the current flowing into the bulk capacitor depends on peak output current, output current ripple, switching frequency, duty- cycle and chopping style. It also depends on power supply characteristics. A power supply with poor high fre- quency performances (or long, inductive connections to the IC) will cause the bulk capacitor to be recharged slowly: the higher the current control switching frequency, the higher the current ripple in the capacitor; r.m.s. current in the capacitor, however, does not exceed the r.m.s. output current. Bulk capacitor value ( C) and the ESR determine the amount of voltage ripple on the capacitor itself and on the IC. In slow decay, neglecting the dead-time and output current ripple, and assuming that during the on-time the capacitor is not recharged by the power supply, the voltage at the end of the on-time is: , so the supply voltage ripple is: , Out 2 Out 1 V S I OUT – ESR t ON C --------- + ⋅ I OUT ESR t ON C --------- + ⋅ |
유사한 부품 번호 - L6207 |
|
유사한 설명 - L6207 |
|
|
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 |
Korean ▼
English
Chinese
German
Japanese
Russian
Korean
Spanish
French
Italian
Portuguese
Polish
Vietnamese
Indian
Mexican
British
New Zealand
