 |
전자부품 데이터시트 검색엔진 |
|
|
전자부품 데이터시트 검색엔진 |
|
AN557 데이터시트(PDF) 42 Page - STMicroelectronics |
|
|
|||||||||||||||||||||||||||||
AN557 데이터시트(HTML) 42 Page - STMicroelectronics |
|
|
42 / 52 page  AN557 APPLICATION NOTE 42/52 Figure 56. Figure 57. Figure 58. POWER SUPPLY WITH 0 TO 25V ADJUSTABLE OUTPUT VOLTAGE a) It is a classical solution with high performance that make use of a negative reference voltage equal to the value of the internal voltage of the device (5.1V). To generate this negative reference voltage, it is useful to equip the mains trnsformer with another sec- ondary winding at a low voltage of around 8Vac and capable of delivering a few dozen of mA. During the phase of starting up and stopping of the mains, it is important to avoid generating oscillations around the value of the output voltage , including the zero voltage. For this reason a network consisting of two NPN signal transistors TR1 and TR2 and some resistors has been introduced. The transistor TR2 remains is saturation when TR1 is off, untill the output voltage of the negative reg- ulator reaches 4.3V At this point TR1 goes in saturation, sending off TR2. In this way the soft start is |
|
링크 URL |
| ALLDATASHEET 가 귀하에 도움이 되셨나요? [ DONATE ] |
Alldatasheet는? | 광고문의 | 운영자에게 연락하기 | 개인정보취급방침 | 링크 투 데이터시트 | 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
