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LTC4253AIGN-ADJ bảng dữ liệu(PDF) 1 Page - Linear Technology |
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LTC4253AIGN-ADJ bảng dữ liệu(HTML) 1 Page - Linear Technology |
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1 / 32 page  LTC4253A-ADJ 1 4253a-adjf The LTC ®4253A-ADJ negative voltage Hot SwapTM con- troller allows a board to be safely inserted and removed from a live backplane. Output current is controlled by three stages of current-limiting: a timed circuit breaker, active current limiting and a fast feedforward path that limits peak current under worst-case catastrophic fault condi- tions. The LTC4253A-ADJ latches off after a circuit fault. Undervoltage and overvoltage detectors with adjustable thresholds and hystereses disconnect the load whenever the input supply exceeds the desired operating range. The LTC4253A-ADJ’s supply input is shunt-regulated, allowing safe operation with very high supply voltages. A multifunc- tion timer delays initial start-up and controls the circuit breaker’s response time. The circuit breaker’s response time can be accelerated by sensing excessive MOSFET drain voltage. An adjustable soft-start circuit controls MOSFET inrush current at start-up. Three power good outputs can be sequenced to enable external power modules at start-up or disable them if the circuit breaker trips. The LTC4253A-ADJ is available in 20-pin SSOP and 20-pin (4mm × 4mm) QFN packages. ■ – 48V Distributed Power Systems ■ Negative Power Supply Control ■ Central Office Switching ■ High Availability Servers ■ Disk Arrays ■ Allows Safe Board Insertion and Removal from a Live – 48V Backplane ■ Floating Topology Permits Very High Voltage Operation ■ Adjustable Analog Current Limit with Breaker Timer ■ Fast Response Time Limits Peak Fault Current ■ Adjustable Undervoltage/Overvoltage Protection with ±1% Threshold Accuracy ■ Three Sequenced Power Good Outputs ■ Adjustable Soft-Start Current Limit ■ Adjustable Timer with Drain Voltage Accelerated Response ■ Latchoff After Fault ■ Available in 20-Pin SSOP and 20-Pin (4mm × 4mm) QFN Packages – 48V Hot Swap Controller with Sequencer – 48V/2.5A Hot Swap Controller FEATURES DESCRIPTIO APPLICATIO S TYPICAL APPLICATIO 5.6k 5.6k 5.6k † PWRGD1 VIN EN2 EN3 VIN VEE SEL LTC4253A-ADJ LOAD1 PWRGD2 PWRGD3 OV OVL DRAIN SS GATE SQTIMER SENSE TIMER EN LOAD2 EN LOAD3 EN 2.5k 15k(1/4W)/6 UV RESET UVL 4253A TA01 10 Ω 1M 0.02 Ω IRF530S *DIODES, INC. †MOC207 10nF 0.68 µF 0.1 µF 33nF 10nF + 100 µF 0.536k 1% B3100* 255k 1% – 48V A – 48V B – 48V RTN – 48V RTN 2.1k 1% 1.24k 1% B3100* † † 20k 1% 1 µF , LTC and LT are registered trademarks of Linear Technology Corporation. Hot Swap is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. Patent pending. GATE 10V SS 1V SENSE 50mV VOUT 50V 1ms/DIV 4253A TA01b Start-Up Behavior |
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