انلاګ وسایل LT8640SA همغږي ګام ښکته خاموش سویچر 2
د محصول معلومات
مشخصات
- د محصول نوم: د EVAL-LT8640SA-AZ لپاره تفتیش وسپارئ، موږ به په XNUMX ساعتونو کې له تاسو سره اړیکه ونیسو.
- ماډل: LT8640SA
- د ننوتلو رسولو لړۍ: 5.8V – 42V
- د محصول Voltage: 4.85V – 5.15V
- د اوسني تولید اعظمي حد: 6A
- د فریکونسی بدلول: 1.85MHz – 2.15MHz
- موثریت: 94.3%
د محصول کارولو لارښوونې
- JP1 په BURST موقعیت کې ځای په ځای کړئ.
- With the power off, connect the input power supply to VIN and GND.
- With the power off, connect the load from VOUT to GND.
- په ان پټ کې د بریښنا رسولو چالان کړئ. (ډاډ ترلاسه کړئ چې د ان پټ حجمtage does not exceed 42V)
- د مناسب محصول حجم لپاره وګورئtage (VOUT = 5V).
- If there is no output, temporarily disconnect the load to ensure it is within operating ranges.
- Adjust the load within the operating ranges and observe the output.
عمومي توضیحات
- The demonstration circuit EVAL-LT8640SA-AZ is a 42V, 6A micropower synchronous step-down second generation Silent Switcher® with spread spectrum frequency modulation featuring the LT8640SA.
- The demo board is designed for 5V output from a 5.8V to 42V input.
- The wide input range allows a variety of input sources, such as automotive batteries and industrial supplies.
- The LT8640SA is a compact, ultra-low emission, high efficiency, and high speed synchronous monolithic step-down switching regulator.
- The integrated bypass capacitors optimize all the fast current loops and make it easier to minimize EMI/EMC emissions by reducing layout sensitivity.
- A selectable spread spectrum mode can further improve EMI/EMC performance.
- Ultra-low quiescent current in Burst Mode® operation achieves high efficiency at very light loads.
- Fast minimum on-time of 30ns enables high VIN to low VOUT conversion at high frequency.
- Program the LT8640SA switching frequency either through the oscillator resistor or external clock over a 200kHz to 3MHz range.
- The default frequency of demo circuit EVAL-LT8640SA-AZ is 2MHz.
- The SYNC pin on the demo board is grounded (JP1 at BURST position) by default for low ripple Burst Mode operation.
- To synchronize to an external clock, move JP1 to SYNC and apply the external clock to the SYNC terminal.
- Select the spread spectrum mode and forced continuous mode (FCM) respectively by moving JP1 shunt. Figure 3 shows the efficiency of the circuit at 12V input and 24V input in Burst Mode Operation. Figure 4 shows the LT8640SA temperature rising on the EVAL-LT8640SA-AZ demo board under different load conditions.
- The rated maximum load current is 6A, while derating is necessary for certain input voltage او حرارتي شرایط.
The demo board doesn’t have an EMI filter installed, but it leaves footprints for the filter components. Figure 5 shows the EMI performance of the board (without EMI filter). - The red line in Radiated EMI Performance is the CISPR32 Class B limit. The figure shows that the circuit passes the test with a wide margin. An inductor and input capacitors can be added in the EMI filter footprint to further reduce the EMI emission.
- The LT8640SA data sheet gives a complete description of the part, operation and application information.
- Read the data sheet in conjunction with this demo manual for EVAL-LT8640SA-AZ.
- The LT8640SA is assembled in a 4mm x 4mm LQFN package with exposed pads for low thermal resistance.
- The layout recommendations for low EMI operation and maximum thermal performance are available in the data sheet section ‘Low EMI PCB Layout and Thermal Considerations and Peak Output Current’.
د فعالیت لنډیز
د فعالیت لنډیز مشخصات په TA = 25°C کې دي
| پیرامیټر | SYMBOL | شرطونه | MIN | TYP | MAX | UNIT |
| د ننوتلو رسولو لړۍ | VIN | 5.8 | 42 | V | ||
| د محصول Voltage | VOUT | 4.85 | 5 | 5.15 | V | |
| د اعظمي محصول اوسني | IOUT | 6 | A | |||
| د تعدد بدلول | fSW | Derating د ځینې V لپاره اړین دیIN and Thermal Conditions | 1.85 | 2 | 2.15 | MHz |
| موثریت | ای ایف ایف | VIN = 12V، Iبهر = 3A | 94.3 | % | ||
د چټک پیل طرزالعمل
The demonstration circuit EVAL-LT8640SA-AZ is easy to set up to evaluate the performance of LT8640SA. See Figure 1 for proper measurement equipment setup, and follow the procedures below:
یادونه: کله چې د ننوتلو یا محصول حجم اندازه کولtagد څپو په صورت کې، په اوسیلوسکوپ پروب کې د اوږدې ځمکې لیډ څخه د مخنیوي لپاره محتاط اوسئ. د مناسب ساحې تخنیک لپاره شکل 2 وګورئ.
- JP1 په BURST موقعیت کې ځای په ځای کړئ.
- With the power off, connect the input power supply to VIN and GND.
- With the power off, connect the load from VOUT to GND.
- په ان پټ کې د بریښنا رسولو فعال کړئ.
یادونه: ډاډ ترلاسه کړئ چې د ننوتلو حجمtagد 42V څخه ډیر نه وي. - د مناسب محصول حجم لپاره وګورئtage (VOUT = 5V).
یادونه: If there is no output, temporarily disconnect the load to make sure that the load is not set too high or is shorted. - یوځل چې د مناسب محصول حجمtage تاسیس شوی، د عملیاتي حدودو دننه بار تنظیم کړئ او د محصول حجم وګورئtage مقررات، ripple voltage، موثریت، او نور پیرامیټونه.
- Add an external clock to the SYNC terminal when using the SYNC function (JP1 on the SYNC position). Choose R2 to set the LT8640SA switching frequency equal to or below the lowest SYNC frequency. JP1 can also set LT8640SA in spread spectrum mode (JP1 on the SPREAD-SPECTRUM position) or forced continuous mode (JP1 on the FCM position).
د عادي فعالیت ځانګړتیاوې
EVAL-LT8640SA-AZ کټ سکیماتیک
د EVAL-LT8640SA-AZ کټ د موادو بیل
| ITEM | QTY | حواله | د برخې تفصیل | جوړونکی/برخه شمیره |
| د اړتیا وړ سرکیت اجزا | ||||
| 1 | 1 | C1 | CAP., ALUM ELECT 22μF, 63V, 20%, 6.3mm x 7.7mm,
AEC-Q200, 1.2Ω, 120MA, 2000H |
د EEEFN1J220XP معرفي کول |
| 2 | 1 | C12 | CAP., CER 0.1μF, 50V, 10%, X7R 0402m, AEC-Q200, LOW ESR | CGA2B3X7R1H104K050BB |
| 3 | 2 | C17، C18 | CAP., CER 1μF, 10V, 10%, X7S 0402 | C1005X7S1A105K050BC |
| 4 | 1 | C2 | CAP., CER 10μF, 50V, 10%, X7R 1210, AEC-Q200 | 12105C106K4T2A |
| 5 | 2 | C3، C4 | CAP., CER 1μF, 50V, 10%, X5R 0603, AEC-Q200 | GRT188R61H105KE13D |
| 6 | 1 | C5 | CAP., CER 0.1μF, 16V, 10%, X7R 0603 | C0603C104K4RAC |
| 7 | 1 | C6 | CAP.، CER 10pF، 50V، 5٪، C0G 0603 | C0603H100J5GAC7867 |
| 8 | 1 | C7 | CAP., CER 100μF, 10V, 20%, X5R 1210 | د GRM32ER61A107ME20L معرفي کول |
| 9 | 1 | C8 | CAP., CER 1μF, 10V, 10%, X7R 0603 | C0603C105K8RACTU |
| 10 | 1 | C9 | CAP., CER 10μF, 10V, 10%, X5R 0603, LOW ESR | C1608X5R1A106K080AC |
| 11 | 1 | L1 | IND POWER SHIELDED WIREWOUND 1.5μH, 20%, 1MHZ, 14A, 0.01052Ω, DCR HIGH CURRENT, AEC-Q200 | د XEL6030-152MEB معرفي کول |
| 12 | 1 | Q1 | TRAN N-CH MOSFET, 40V, 14A | SUD50N04-8M8P-4GE3 |
| 13 | 2 | R1، R4 | RES., SMD 100KΩ, 1%, 1/10W, 0603, AEC-Q200 | CRCW0603100KFKEA |
| 14 | 1 | R10 | RES., SMD 49.9Ω, 1%, 1/10W, 0603, AEC-Q200 | ERJ-3EKF49R9V |
| 15 | 1 | R2 | RES., SMD 17.8KΩ, 1%, 1/10W, 0603, AEC-Q200 | CRCW060317K8FKEA |
| 16 | 1 | R3 | RES., SMD 243KΩ, 1%, 1/10W, 0603, AEC-Q200 | CRCW0603243KFKEA |
| 17 | 1 | R5 | RES., SMD 50Ω, 1%, 1/10W, 0603, AEC-Q200 | CRCW060350R0FKEA |
| 18 | 1 | R6 | RES., SMD 1MΩ, 1%, 1/10W, 0603, AEC-Q200 | CRCW06031M00FKEA |
| 19 | 1 | R7 | RES., SMD 0Ω, JUMPER, 1/10W 0603, AEC-Q200 | ERJ-3GEY0R00V |
| 20 | 1 | R9 | RES., SMD 0.1Ω, 1%, 3W, 1225 WIDE, AEC-Q200 | KRL6432E-C-R100-F-T1 |
| 21 | 1 | U1 | IC-ADI LT8640SA | LT8640SAAV#TRPBF |
| اضافي ارزونه بورډ سرکیت اجزا | ||||
| 22 | 2 | C10، C11 | CAP CER, 10μF, 50V, 10%, X7R 1210 | GRM32ER71H106KA12L |
| 23 | 1 | C13 | CAP CER, 0.1μF, 50V, 10%, X7R 0402, AEC-Q200 LOW ESR | CGA2B3X7R1H104K050BB |
| 24 | 3 | C14، C15، C16 | TBD0603 | |
| 25 | 1 | FB1 | IND FERRITE BEAD MULTI LAYER 100Ω AT 100MHZ, 25%, 8A, 0.006Ω, 1812, AEC-Q200 | 74279226101 |
| 26 | 1 | R8 | TBD0603 | |
| هارډویر: یوازې د ارزونې بورډ لپاره | ||||
| 27 | 1 | د ښځینه شونټ 2POS 2mm | 60800213421 | |
| 28 | 4 | سټینډ آف، د ځان ساتلو سپیسر، 12.7mm اوږدوالی | 702935000 | |
|
29 |
12 |
TP1, TP2, TP3, TP4, TP5, TP6, TP7, TP8, TP9, TP10,TP11,TP12 |
د CONN-PCB سولډر ټرمینل ټیسټ پوائنټ ټریټریټ 0.094″ MTG، سوری PCB 0.062 انچه THK |
2501-2-00-80-00-00-07-0 |
| 30 | 4 | D1, D2, D3, D4 | CONN-PCB، د کیلې جیک، ښځینه، غیر موصل، THT، سویج، 0.218 انچه اوږدوالی | 575-4 |
| 31 | 2 | J5 ، J6 | CONN-PCB BNC JACK ST 50Ω | 112404 |
| 32 | 1 | JP1 | CONN-PCB 8POS نارینه HDR بې پرده دوه ګونی قطار ST، 2mm پیچ، 2.80mm سولډر لکۍ | 62000821121 |
د EVAL-LT8640SA-AZ کټ PCB ترتیب
د بیاکتنې تاریخ
| د بیاکتنې شمیره | بیاکتنه DATE | تفصیل | پاڼې بدلې شوې |
| 0 | ۹/۹۷ | ابتدايي خوشې کول | - |
یادښتونه
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FAQ
پوښتنه: د ډیمو سرکټ د ډیفالټ سویچنګ فریکونسۍ څومره ده؟
A: The default switching frequency of demo circuit EVAL-LT8640SA-AZ is 2MHz.
پوښتنه: څنګه کولی شم د بهرني ساعت سره همغږي شم؟
A: Move JP1 to SYNC and apply the external clock to the SYNC terminal to synchronize to an external clock.
پوښتنه: د LT8640SA اعظمي بار جریان څومره دی؟
A: The rated maximum load current is 6A, but derating is necessary for certain input voltage او حرارتي شرایط.
پوښتنه: ایا د ډیمو بورډ کې د EMI فلټر نصب شوی دی؟
A: The demo board doesn't have an EMI filter installed, but it leaves footprints for the filter components.
اسناد / سرچینې
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انلاګ وسایل LT8640SA همغږي ګام ښکته خاموش سویچر 2 [pdf] د کارونکي لارښود EVAL-LT8640SA-AZ، LT8640SA همغږي ګام-ښکته خاموش سویچر 2، LT8640SA، همغږي ګام-ښکته خاموش سویچر 2، ګام-ښکته خاموش سویچر 2، خاموش سویچر 2، سویچر 2 |