Overview
The TPS2391DGKR is a hot swap power manager integrated circuit designed by Texas Instruments. It is optimized for use in nominal -48-V systems and is capable of handling supply voltage ranges from -36 V to -80 V, with transient ratings up to -100 V. This device is particularly useful for enabling live insertion of plug-in cards and modules in powered systems, such as those found in distributed power systems, central office switching, and wireless base stations. The TPS2391DGKR features an auto-retry mechanism, which periodically retries the load in the event of a fault, distinguishing it from the TPS2390 which latches off in response to current faults.
Key Specifications
| Parameter | Value |
|---|---|
| Package | VSSOP (DGK), 8 pins |
| Operating Temperature Range | -40°C to 85°C |
| Input Supply Range | -36 V to -80 V |
| Transient Rating | -100 V |
| Programmable Current Limit | Yes, via sense resistor value |
| Programmable Current Slew Rate | Yes, via capacitor connected to IRAMP pin |
| Enable Input (EN) | Yes, referenced to -VIN potential |
| Fault Timer | Yes, to eliminate nuisance trips |
| Open-Drain Fault Output (FAULT) | Yes, active-low indication of load fault |
| External Components Required | Few |
Key Features
- Wide Input Supply Range: -36 V to -80 V
- Transient Rating to -100 V
- Programmable Current Limit and Current Slew Rate
- Enable Input (EN) to turn on/off power to the load
- Fault Timer to eliminate nuisance trips
- Open-Drain Fault Output (FAULT) for fault indication
- Requires few external components
- 8-Pin MSOP Package
Applications
- -48-V Distributed Power Systems
- Central Office Switching
- Wireless Base Station
Q & A
- What is the input supply range of the TPS2391DGKR?
The input supply range is from -36 V to -80 V, with transient ratings up to -100 V.
- How does the TPS2391DGKR handle faults?
The TPS2391DGKR periodically retries the load in the event of a fault, unlike the TPS2390 which latches off.
- What is the purpose of the Enable Input (EN) pin?
The Enable Input (EN) pin is used to turn on/off power to the load, referenced to the -VIN potential.
- How is the fault timer programmed?
The fault timer is programmed using an external capacitor connected to the FLTTIME pin.
- What is the function of the Open-Drain Fault Output (FAULT) pin?
The Open-Drain Fault Output (FAULT) pin provides an active-low indication of a load fault condition.
- How is the current limit programmed in the TPS2391DGKR?
The current limit is programmed by selecting the appropriate sense resistor value connected to the ISENS pin.
- Can the current slew rate be programmed?
Yes, the current slew rate can be programmed using a capacitor tied to the IRAMP pin.
- What are the typical applications of the TPS2391DGKR?
The typical applications include -48-V distributed power systems, central office switching, and wireless base stations.
- What package type is the TPS2391DGKR available in?
The TPS2391DGKR is available in an 8-pin VSSOP (DGK) package.
- What is the operating temperature range of the TPS2391DGKR?
The operating temperature range is from -40°C to 85°C.
