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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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LTC4366 датащи(PDF) 1 Page - Analog Devices |
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LTC4366 датащи(HTML) 1 Page - Analog Devices |
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1 / 32 page  LTC7862 1 Rev 0 For more information www.analog.com Document Feedback TYPICAL APPLICATION FEATURES DESCRIPTION 140V High Efficiency Switching Surge Stopper The LTC®7862 high efficiency switching surge stopper pro- tects loads from high voltage transients. High efficiency switching allows high output currents, small solution sizes, and high reliability. During an input overvoltage event, the LTC7862 controls the gates of two external N-channel MOSFETs to act as a switching DC/DC step-down regu- lator. This maintains the output voltage at a safe value, allowing the loads to continue to operate through the input overvoltage event. During normal operation, the LTC7862 turns on the top external N-channel MOSFET continuously, passing the input voltage through to the output, with mini- mal voltage drop. Using a fast peak current comparator, the LTC7862 also limits the maximum output current to protect against overcurrent and short-circuit faults. An adjustable timer limits the time that the LTC7862 can spend switching during an overvoltage, overcurrent, or startup condition. When the timer expires, the external MOSFETs are turned off for a cooldown period and then the LTC7862 restarts. By strictly limiting how long the LTC7862 can switch, when the power loss is relatively high, the components and thermal design can be opti- mized for normal pass-through operation while still safely operating through high voltage input surges and/or over- current events. 28V, 20A with 100V Overvoltage Protection APPLICATIONS n VOUT Clamp Stops High Voltage Input Surges n 100% Duty Cycle Pass-Through Mode During Normal Operation n Switches During Overvoltage or Overcurrent Transients and Faults and During Startup n High Efficiency Switching Enables Long Duration Surge Protection and High Output Currents n Wide VIN Range: 4V to 140V (150V Abs Max) n Adjustable Output Voltage Clamp Up to 60V n Adjustable Output Overcurrent Protection n RSENSE or Inductor DCR Current Sensing n Power Inductor Reduces Input EMI in Normal Mode n Adjustable Soft-Start for Inrush Current Limiting n Programmable Fault Timer n Open-Drain Fault Warning Indicator n 2.7% Retry Duty Cycle During Faults n Adjustable Switching Frequency: 50kHz to 900kHz n Adjustable Input Voltage Turn-On Threshold n Adjustable Input Overvoltage Lockout Threshold n 20-Pin 4mm × 5mm QFN and TSSOP Packages n Automotive/Avionic/Industrial Surge Protection n Automotive Load Dump Protection n Vehicle Power Including ISO7637 n Military Power Including MIL1275 All registered trademarks and trademarks are the property of their respective owners. Overvoltage Protector Regulates Output at 28V During VIN Transient MTOP ×2 MBOT L, 6.8µH 1M 24.3k 0.47µF CINB 2.2µF ×3 CINA 22µF 4.7µF 100pF 6.8nF 22µF 100k 0.1µF 4.75k 0.1µF COUTB 6.8µF ×3 COUTA 100µF 36.5k 2.05k 2.2µF 1M D1 2.21k VFB DRVUV FREQ ITH RUN INTVCC VIN BG SW TG BOOST TMR SENSE+ SENSE– LTC7862 VIN 8V TO 100V DRVCC SS OVLO EXTVCC GND WARNB *VOUT CLAMPED AT 34V 20A INTVCC WARNB DRVCC 7862 TA01a MTOP/MBOT: INFINEON BSC035N10NS5 L: COILCRAFT SER2918H-682KL CINA: SUNCON 160CE22LH CINB: TDK C4532X7R2A225K230KA COUTA: SUN 63CE100LX COUTB: TDK C4532X7R1H685K250KB D1: NEXPERIA: PNE20010ER * VOUT FOLLOWS VIN WHEN VIN < 34V VOUT CLAMPS AT 34V WHEN VIN > 34V 28V 34V 100V INPUT SURGE VIN VOUT 100ms/DIV VIN/VOUT 50V/DIV SW 100V/DIV WARNB 5V/DIV 7862 TA01b |
Аналогичный номер детали - LTC4366 |
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Аналогичное описание - LTC4366 |
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