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MCP18480 Arkusz danych(PDF) 1 Page - Microchip Technology |
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MCP18480 Arkusz danych(HTML) 1 Page - Microchip Technology |
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1 / 64 page  2003 Microchip Technology Inc. DS20091B-page 1 M MCP18480 Features • Allows safe board removal and insertion from a live backplane • Accurate (<1.5%) internal voltage reference for fault detection and precision timing • Programmable foldback current limiting • Programmable circuit breaker current limiting • Auto restart option for all faults • Adjustable Undervoltage lockout thresholds • Adjustable Overvoltage protection threshold • Adjustable Power Good delay • Configurable Power Good output polarity • Low-side drive of an external N-channel FET CMOS Technology • High-Voltage Operation • Temperature range: Industrial (I): -40°C to +85°C Packaging • 20-lead SSOP Package Type Description The MCP18480 is a Hot Swap controller that allows boards to be safely removed or inserted from an active backplane using -48V. When PCBs are inserted into a live backplane, high- peak or transient currents from the source are gener- ated due to the charging of the bypass capacitors on the supply. The high transient currents can destroy connectors and capacitors. The high inrush current can pull the input voltage BUS down and reset the system. The MCP18480 solves this problem by controlling the slew rate of the backplane voltage to the board so that these transients are eliminated. This allows boards to be removed and inserted without causing damage to connector pins and input bulk capacitors, in addition to preventing false resets to the other boards on the backplane. The MCP18480 can be used in applications in several areas including: • Telecom Line Cards • Network Switches • Network Routers and Servers • Base Station Line Cards • Power-Over-LAN •Power-Over-MDI • IP Phone Switches/Routers • Mid-Span, Power-Over-MDI Two forms of current limit are provided in the MCP18480. These are: • Foldback • Circuit breaker The foldback current-limiting circuit uses an external sense resistor and a voltage that is proportional to the external MOSFET’s drain voltage. These are used to keep the MOSFET in its Safe Operating Area (SOA). If the device remains in current limit for a programmed time period, the external N-channel FET is turned off. The option exists to configure the device to automati- cally restart after a programmed time delay. A program- mable catastrophic current limit threshold shuts down the switch (circuit breaker) if excessive current is sensed due to a short-circuit condition. 2 3 4 5 6 7 8 9 10 1 19 18 16 15 14 13 12 11 17 20 ENABLE RESTART UVD VREFIN OVO VFB PWRGOOD DRAINTH SENSE GATE CL ISET TIMER RDISCH VNEG OVTH UVTH UVHYS VREFOUT VPOS SSOP -48V Hot Swap Controller |
Podobny numer części - MCP18480 |
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Podobny opis - MCP18480 |
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