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Summary of Contents for Texas Instruments TPS2350 -48-V
- Page 1 User’s Guide TPS2350 −48-V Hot Swap/Supply Selector Evaluation Module User’s Guide...
- Page 2 IMPORTANT: TI is providing the enclosed HPA021A evaluation module under the following conditions: This evaluation module (EVM) being provided by Texas Instruments (TI) is intended for use for ENGINEERING DEVELOPMENT OR EVALUATION PURPOSES ONLY and is not considered by Texas Instruments to be fit for commercial use.
- Page 3 EVM User’s Guide. When placing measurement probes near these devices during operation, please be aware that these devices may be very warm to the touch. Mailing Address: Texas Instruments Post Office Box 655303 Dallas, Texas 75265 Copyright 2003, Texas Instruments Incorporated...
- Page 4 This User’s Guide describes the use and features of the TPS2350 −48-V Hot Swap/Supply Selector Evaluation Module (EVM). This EVM can be used to learn about the TPS2350 Hot Swap Power Manager (HSPM) Integrated Circuit (IC) from Texas Instruments (TI). Contents Introduction .
- Page 5 SLUU171A - September 2003 Introduction The TPS2350 is a negative voltage hot swap controller intended for use in systems needing to hot swap telecom distribution-level voltages. It integrates inrush current control, peak current limiting, electronic circuit breaker, and overvoltage and undervoltage protection. In addition, it monitors and selects from two power supplies the larger magnitude supply, reducing OR-ing losses in redundant supply systems.
- Page 6 SLUU171A - September 2003 The TPS2350 −48-V Hot Swap/Supply Selector EVM Kit Module Description The TPS2350 −48-V hot swap/supply selector EVM kit is a PCB-based platform that enables designers to rapidly learn about the TPS2350 operation, and evaluate its performance during hot swap events. The assembly (TI part number HPA021−001) features a TPS2350 device as it may be connected in the power interface section of a hot swap-capable plug-in card.
- Page 7 SLUU171A - September 2003 The pictorial of the TPS2350 −48-V hot swap/supply selector EVM top assembly is shown in Figure 1. Figure 1. Evaluation Module Top Assembly TPS2350 −48-V Hot Swap/Supply Selector Evaluation Module...
- Page 8 SLUU171A - September 2003 EVM Schematic Diagram and List of Materials The EVM schematic diagram is shown in Figures 2 and 3. Figure 2. TPS2350 −48-V Hot Swap/Supply Selector EVM Schematic (Sheet 1) TPS2350 −48-V Hot Swap/Supply Selector Evaluation Module...
- Page 9 SLUU171A - September 2003 Figure 3. TPS2350 −48-V Hot Swap/Supply Selector EVM Schematic (Sheet 2) TPS2350 −48-V Hot Swap/Supply Selector Evaluation Module...
- Page 10 Jack, test point, red TP22−TP27 Screw, nylon, round head, #6−32, 0.25” Eagle 010632R025 PCB, FR−4, 2-layer, SMOBC, 5.43” x 3.80”, 0.062” Texas Instruments HPA021 IC, Hot Swap Power Manager for Redundant −48-V Sup- Texas Instruments TPS2350PW plies IC, linear, optocoupler, 30 V, CTR = 0.2 minimum Fairchild 4N25.S...
- Page 11 SLUU171A - September 2003 TPS2350 −48-V Hot Swap/Supply Selector EVM Operating Specifications The supply selector EVM is intended to allow some degree of user reconfiguration. This allows designers to set up the circuit to better represent the characteristics of their target application. Potential modifications include changing the current limit threshold, the inrush limiting, the fault timing, and load characteristics.
- Page 12 SLUU171A - September 2003 Verifying the EVM Operation The following procedure steps may be used to verify functional operation of the EVM after receipt. 3.2.1 Equipment Setup On the EVM, place the POWER and ENABLE switches in the OFF position. Set the DIP switches 1 through 4 of switch SW1 to the ON position.
- Page 13 SLUU171A - September 2003 3.2.2 Functional Test Turn on all the power supplies. On the EVM, place the POWER switch in the ON position. Verify the FAULT LED (D1) remains off. Verify the voltage readings in Table 4 are obtained at the corresponding test points. Table 4.
- Page 14 SLUU171A - September 2003 Using the EVM Kit to Evaluate the TPS2350 Procedures similar to the steps of Section 3.2.2 for functional test of the EVM can also be used to continue evaluation of the TPS2350 hot swap controller device. Additional details about the EVM features are provided in this section.
- Page 15 SLUU171A - September 2003 Load Capacitors Capacitor patterns C8 and C9 are available on the EVM for installation of components to represent the module input bulk capacitance; i.e., the load capacitance seen by the hot swap interface circuit. As supplied from the factory, the EVM contains a 100-µF aluminum electrolytic installed at C8.
- Page 16 SLUU171A - September 2003 In the Figure 6 plot, the TPS2350 is switchng from the A supply to the B supply when the initially higher-potential A supply lead is rapidly pulled from the input jack. At the time the lead is disconnected, current from that source is interrupted.
- Page 17 SLUU171A - September 2003 The EVM can be used to get an illustration of the relationship between current limit, inrush slew rate, load values, and the circuit’s fault timing requirements. With DIP switch SW1−1 only closed, the fastest of the preset slew rates is selected, and only the hard-wired timing capacitor C6 is connected to the TPS2350 controller.
- Page 18 SLUU171A - September 2003 Fault Timing with the TPS2350 Whenever the hot swap controller is limiting current to the load, an on-chip timer is monitoring this operation against an established time limit. The timeout period is generated by the constant-current charging of a capacitor at the FLTTIM pin.
- Page 19 SLUU171A - September 2003 The thresholds are easily modified by changing the resistor values. When the desired trip voltages and the UV hysteresis have been established for the protected load, new values are determined as follows. Generally, the process is simplest by first selecting the top leg of the divider (R1) needed to obtain the desired hysteresis. This value is calculated from equation 4.
- Page 20 TI product or service and is an unfair and deceptive business practice. TI is not responsible or liable for any such statements. Following are URLs where you can obtain information on other Texas Instruments products and application solutions:...
- Page 21 Mouser Electronics Authorized Distributor Click to View Pricing, Inventory, Delivery & Lifecycle Information: Texas Instruments TPS2350EVM...
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