LTC7860MPMSE#PBF

LTC7860 High Efficiency Switching Surge Stopper Features Description High Efficiency VOUT Clamp Stops High Voltage Input Surges nn SWITCH-ON Mode 100% Duty Cycle for Normal Operation nn PROTECTIVE PWM Mode for Transients and Faults nn V Pin to SGND Range: 3.5V to 60V IN nn External Input Voltage is Extendable to 200V+ nn Adjustable Output Voltage Clamp nn Adjustable Output Overcurrent Protect...
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Корпус MSOP12
Кол-во защищаемых линий (каналов)
Примечание High Efficiency Switching Surge Stopper
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LTC7860 High Efficiency Switching Surge Stopper Features Description High Efficiency VOUT Clamp Stops High Voltage Input Surges nn SWITCH-ON Mode 100% Duty Cycle for Normal Operation nn PROTECTIVE PWM Mode for Transients and Faults nn V Pin to SGND Range: 3.5V to 60V IN nn External Input Voltage is Extendable to 200V+ nn Adjustable Output Voltage Clamp nn Adjustable Output Overcurrent Protection nn Power Inductor Improves Input EMI in Normal Operation nn Programmable Fault Timer nn Adjustable Soft-Start for Input Inrush Current Limiting nn 4.5% Retry Duty Cycle During Faults nn Adjustable Switching Frequency: 50kHz to 850kHz nn Optional Reverse Input Voltage Protection nn Available in Thermally Enhanced 12-lead MSOP Package The LTC®7860 high efficiency surge stopper protects loads from high voltage transients. High efficiency permits higher currents and smaller solution sizes. During an input overvoltage event, such as a load dump in vehicles, the LTC7860 controls the gate of an external MOSFET to act as a switching DC/DC regulator (PROTECTIVE PWM mode). This operation regulates the output voltage to a safe level, allowing the loads to operate through the input over-voltage event. During normal operation (SWITCHON mode), the LTC7860 turns on the external MOSFET continuously, passing the input voltage through to the output. An internal comparator limits the voltage across the current sense resistor and regulates the maximum output current to protect against overcurrent faults. nn Applications Industrial and Automotive Power Telecom Power nn Vehicle Power Including ISO7637 nn Military Power Including MIL1275 nn nn L, LT, LTC, LTM, OPTI-LOOP, Linear Technology, Burst Mode and the Linear logo are registered trademarks and Hot Swap is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. Protected by U.S. Patents including 5731694. An adjustable timer limits the time that the LTC7860 can spend in overvoltage or overcurrent regulation. When the timer expires, the external MOSFET is turned off until the LTC7860 restarts after a cool down period. By strictly limiting the time in PROTECTIVE PWM Mode when the power loss is high, the components and thermal design can be optimized for normal operation and safely operate through high voltage input surges and/or overcurrent faults. An additional PMOS can be added for reverse battery protection. Typical Application VIN 60V MAX 12V NOM 3.5V MIN VOUT 18V MAX 12V NOM 3.5V MIN 5A 6.8µH 12mΩ 10µF PROTECTIVE PWM: VOUT Clamped to 18V During a VIN Surge GATE VFBN SENSE VIN 60V INPUT SURGE CAP 10µF LTC7860 TMR 22µF 0.1µF 10k 680pF VIN 10V/DIV VFB FREQ 0.47µF 1M RUN SGND PGND VOUT 10V/DIV 18V ADJUSTABLE CLAMP VTMR 1V/DIV 48.7k SS ITH CTMR = 22µF 0.1µF 100ms/DIV 7860 TA01b 7860 TA01a 7860f For more information www.linear.com/LTC7860 1 PDF
Документация на серию LTC7860 

LTC7860 – High Efficiency Switching Surge Stopper

Дата модификации: 02.03.2021

Размер: 823.1 Кб

26 стр.

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