 |
поискавой системы для электроныых деталей |
|
|
поискавой системы для электроныых деталей |
|
LM3410XMFE датащи(PDF) 20 Page - Texas Instruments |
|
|
|||||||||||||||||||||||||||||
LM3410XMFE датащи(HTML) 20 Page - Texas Instruments |
|
|
20 / 49 page  VFB 2 RSET PRSET = D 2 x x = RDSON ¸¸ ¹ · ¨¨ © § D' P NFET - COND ILED Isw-rms = IIND D 1 + 'i IIND 1 3 2 x D IIND | t 'i IIN ISW(t) LM3410, LM3410Q SNVS541G – OCTOBER 2007 – REVISED MAY 2013 www.ti.com Figure 23. LM3410 Switch Current (27) (small ripple approximation) PCOND-NFET = IIN 2 x R DSON x D (28) Or (29) The value for RDSON should be equal to the resistance at the junction temperature you wish to analyze. As an example, at 125°C and RDSON = 250 mΩ (See typical graphs for value). Switching losses are also associated with the internal power switch. They occur during the switch on and off transition periods, where voltages and currents overlap resulting in power loss. The simplest means to determine this loss is to empirically measuring the rise and fall times (10% to 90%) of the switch at the switch node: PSWR = 1/2(VOUT x IIN x fSW x tRISE) (30) PSWF = 1/2(VOUT x IIN x fSW x tFALL) (31) PSW = PSWR + PSWF (32) Table 4. Typical Switch-Node Rise and Fall Times VIN VOUT tRISE tFALL 3V 5V 6nS 4nS 5V 12V 6nS 5nS 3V 12V 8nS 7nS 5V 18V 10nS 8nS Quiescent Power Losses IQ is the quiescent operating current, and is typically around 1.5 mA. PQ = IQ x VIN (33) RSET Power Loss (34) Example Efficiency Calculation: Operating Conditions: 5 x 3.3V LEDs + 190mVREF ≊ 16.7V (35) 20 Submit Documentation Feedback Copyright © 2007–2013, Texas Instruments Incorporated Product Folder Links: LM3410 LM3410Q |
|
ссылки URL |
| Вашему бизинису помогли Аллдатащит? [ DONATE ] |
Что такое Аллдатащит | реклама | контакт | Конфиденциальность | Ссылка на техническое описание | обмен ссыками | поиск по производителю 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 |
Russian ▼
English
Chinese
German
Japanese
Russian
Korean
Spanish
French
Italian
Portuguese
Polish
Vietnamese
Indian
Mexican
British
New Zealand
