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Related Manuals for Texas Instruments TPS2398EBM
Summary of Contents for Texas Instruments TPS2398EBM
- Page 1 User’s Guide TPS2398EVM/TPS2399EVM Evaluation Modules for -48 V Hot Swap Controllers User’s Guide...
- Page 2 EVM IMPORTANT NOTICE Texas Instruments (TI) provides the enclosed product(s) under the following conditions: This evaluation kit being sold by TI is intended for use for ENGINEERING DEVELOPMENT OR EVALUATION PURPOSES ONLY and is not considered by TI to be fit for commercial use. As such, the goods being provided may not be complete in terms of required design-, marketing-, and/or manufacturing-related protective considerations, including product safety measures typically found in the end product incorporating the goods.
- 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 2002, Texas Instruments Incorporated...
- Page 4 (EVM). This EVM can be used to learn about the TPS2398 and TPS2399 hot swap controller integrated circuits (ICs) from Texas Instruments (TI). The TPS2398 and TPS2399 are negative voltage hot swap controllers intended for use in systems needing to hot swap telecom distribution-level voltages.
- Page 5 SLUU172 − October 2003 Description The TPS2398 and TPS2399 simple −48-V hot swap controllers are integrated solutions optimized for use in nominal −48-V systems. They are used in conjunction with an external N-channel MOSFET and sense resistor to enable hot swap, the insertion and removal of plug-in cards or modules in powered systems.
- Page 6 SLUU172 − October 2003 Figure 1. Evaluation Module Top Assembly EVM Schematic Diagram and List of Materials The EVM schematic diagram is shown in Figure 2. Evaluation Modules for −48-V Hot Swap Controllers...
- Page 7 SLUU172 − October 2003 UDG−03018 Figure 2. −48-V Hot Swap Evaluation Module Schematic Evaluation Modules for −48-V Hot Swap Controllers...
- Page 8 SLUU172 − October 2003 Table 1. List of Materials QUANTITY REFERENCE REFERENCE DESCRIPTION DESCRIPTION MANUF MANUF PART NUMBER PART NUMBER DESIGNATOR −002 −001 Texas − IC, −48-V Hot Swap Controller, w/Retry TPS2399DGK Instruments Texas − IC, −48-V Hot Swap Controller, Latching TPS2398DGK Instruments TP1−TP4, TP6,...
- Page 9 SLUU172 − October 2003 −48-V Hot Swap EVM Operating Specifications The −48−V hot swap 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 10 SLUU172 − October 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 1. On the EVM board, place the POWER switch in the OFF position, and verify that the ENABLE switch is in the OFF position.
- Page 11 SLUU172 − October 2003 3.2.2 Functional Test 1. Turn on the power supply. On the EVM, place the POWER switch in the ON position. Verify the power good LED (D1) is OFF. Verify the DVM reading is 0 ±100 mV. 2.
- Page 12 SLUU172 − October 2003 Using the Evaluation Module to Evaluate the TPS2398/99 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 TPS2398 and TPS2399 hot swap controllers. Additional details about the EVM features are provided in this section.
- Page 13 SLUU172 − October 2003 Changing the Current Limit Threshold During power-up of a plug-in card, the TPS2398 and TPS2399 limit the peak inrush current drawn by the discharged bulk capacitance. The LCA senses load current as the drop across an external sense resistor.
- Page 14 SLUU172 − October 2003 To observe the controller response to a load that does not charge up as expected (a shorted or otherwise excessive load), set switches SW1−1, SW1−2, and SW1−3 to the ON position. This greatly reduces the inrush (load charging) current slew rate at turn-on, with a corresponding increase in the amount of time needed to successfully charge the intended load.
- Page 15 SLUU172 − October 2003 If the target application requires fault timing other than that provided by the default EVM setup, a new value of timing capacitor can be calculated from equation (3). When selecting from the readily available capacitor values for the result of equation (3), default to a slightly larger, rather than smaller, capacitor.
- Page 16 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:...