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DS4560S-LO+T Datasheet(PDF) 5 Page - Maxim Integrated Products |
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DS4560S-LO+T Datasheet(HTML) 5 Page - Maxim Integrated Products |
5 / 8 page DS4560 THERMAL LIMIT EXTERNAL DISABLE TIMER CTIMER +5V 2.5V UVLO CURRENT LIMIT CHARGE PUMP LOAD +5V VREG OVERVOLTAGE LIMIT GND R R RILIM LOAD ILIM +12V VCC VRAMP VCC 80 μA 80 μA CVRAMP Block Diagram/Typical Application Circuit 12V Hot-Plug Switch _______________________________________________________________________________________ 5 Detailed Description The DS4560 begins to operate when VCC exceeds the undervoltage lockout level, VUVLOR. At this level, the enable circuit and TIMER pin become active. Once the device has been enabled, a gate voltage is applied to the power MOSFET, allowing current to begin flowing from VCC to LOAD. The speed of the output-voltage ramp is controlled by the capacitance placed at the VRAMP pin. The load current is continuously monitored during the initial voltage ramping (ISCL) and during nor- mal operation (IOVL). If the current exceeds the current limit that is set by the external resistance at ILIM, the gate voltage of the power MOSFET is decreased, reducing the output current to the set current limit. Current is limited by the DS4560 comparing the voltage difference between the LOAD and ILIM pins to an inter- nal reference voltage. If the output current exceeds the limit that is set by the RILIM resistor, the gate voltage of the power MOSFET is decreased, which reduces the output current to the load. When the output power is initially ramping up, the current limit is ISCL. Once the voltage ramping is complete, the current limit is IOVL. The lower ISCL current limit protects the source if there is a dead short on initial power-up. The DS4560 acts as a fuse and automatically disables the current flowing to the load when the temperature of the power MOSFET has exceeded the shutdown junc- tion temperature, TSHDN. |
Similar Part No. - DS4560S-LO+T |
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Similar Description - DS4560S-LO+T |
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