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EVM User's Guide: TPS1685EVM
TPS1685 Evaluation Module for eFuse
Description
The TPS1685EVM is used to evaluate the
performance of the TPS1685 eFuse device. The
TPS1685EVM comes with two TPS16851 eFuses
connected in parallel to evaluate a 54V (typical) and
40A (steady state) design. This evaluation module
incorporates two TPS16851 devices in parallel, which
supports a 2kW input power path protection design at
an input voltage of 48V.
Features
•
40V to 60V (typical) operation
•
10A to 44A programmable circuit breaker
threshold using onboard jumpers
•
Adjustable reference voltage for over-current
protection and active current sharing blocks
•
undervoltage and overvoltage protections
•
Adjustable output voltage slew rate control using
onboard jumpers
SLVUCW7A – SEPTEMBER 2024 – REVISED APRIL 2025
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•
Adjustable transient current blanking timer using
onboard jumpers
•
Adjustable active current sharing threshold using
onboard jumpers
•
Adjustable scalable fast-trip threshold using
onboard jumpers
•
TVS diode for input and Schottky diode for output
transient protections
•
LED status for power good and fault indications
•
Options to engage the enable power cycle and the
quick output discharge (QOD)
Applications
•
Input hotswap and hotplug
•
Server
•
Network interface cards
•
Graphics and hardware accelerator cards
•
Data center switches
•
Fan trays
•
Switches and routers
TPS1685EVM
Copyright © 2025 Texas Instruments Incorporated
and
high performance computing
and
routers
TPS1685 Evaluation Module for eFuse
Description
1
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Summary of Contents for Texas Instruments TPS1685EVM
- Page 1 TPS1685 Evaluation Module for eFuse • Adjustable transient current blanking timer using Description onboard jumpers The TPS1685EVM is used to evaluate the • Adjustable active current sharing threshold using performance of the TPS1685 eFuse device. The onboard jumpers TPS1685EVM comes with two TPS16851 eFuses •...
- Page 2 1 Evaluation Module Overview 1.1 Introduction The TPS1685EVM eFuse Evaluation Board allows reference circuit evaluation of Texas Instruments' TPS1685 eFuse. The TPS1685 device is a 9V to 80V and 20A (RMS) stackable eFuse with an accurate and fast current monitoring capability. This device supports the parallel connection of multiple eFuses for higher current designs by actively synchronizing the device states and sharing the loads during start-up and steady state.
- Page 3 Evaluation Module Overview 1.4 Device Information The TPS1685EVM enables the evaluation of TPS16850x and TPS16851x eFuses from TPS1685 family. The input power is applied across the connectors T1 and T3, while T2 and T3 provide the output connection for the...
- Page 4 Kelvin sensing points to measure secondary eFuse ON resistance TP24 S2_N QGND1, QGND2, QGND Device ground QGND3, and QGND4 TPS1685 Evaluation Module for eFuse SLVUCW7A – SEPTEMBER 2024 – REVISED APRIL 2025 Submit Document Feedback Copyright © 2025 Texas Instruments Incorporated...
- Page 5 A DPO2024 or equivalent, three 10x voltage probes, and a DC current probe of 150A rated. 2.1.2.4 Loads One resistive load or equivalent which can tolerate up to 100A DC load at 80V. SLVUCW7A – SEPTEMBER 2024 – REVISED APRIL 2025 TPS1685 Evaluation Module for eFuse Submit Document Feedback Copyright © 2025 Texas Instruments Incorporated...
- Page 6 In this user's guide, the test procedure is described for TPS1685 eFuse. Make sure the evaluation board has default jumper settings as shown in Table 3-1. Table 3-1. Default Jumper Setting for TPS1685EVM eFuse Evaluation Board Digital Oscilloscope Multimeter POWER...
- Page 7 6. Observe the waveforms at VOUT (TP2) and input current using an oscilloscope to measure the slew rate and rise time of the VOUT with a given input voltage of 54V. The examples of the hot plug event captured on the TPS1685EVM with two TPS1685 devices in parallel are shown in Figure 3-2.
- Page 8 3. Keep the eFuses disabled by pressing the switch SW1. 4. Turn ON the power supply. 5. Enable the TPS1685 eFuse by releasing the switch SW1. The test waveforms of power up into output short on the TPS1685EVM with two devices in parallel are shown in Figure 3-4.
- Page 9 2. Apply a load of 50Ω between VOUT (connector T2) and PGND (connector T3). 3. Increase the input supply VIN from 54V to 62V and decrease to 54V again, and observe the waveforms using an oscilloscope. The overvoltage lockout response of TPS1685 eFuse on TPS1685EVM is shown in Figure 3-6.
- Page 10 J2. TIMER 8. Observe the waveforms using an oscilloscope. The transient overload performance of TPS1685 eFuse on TPS1685EVM with two devices in parallel is shown in Figure 3-7. Figure 3-7. Transient Overload Performance of TPS1685 eFuse (V...
- Page 11 4. Short the output of the device for example, VOUT (connector T2) to PGND (connector T3) through a short cable. 5. Observe the waveforms using an oscilloscope. The test waveforms of output hot short on the TPS1685EVM with two TPS1685 eFuses in parallel are shown in Figure 3-10 Figure 3-10.
- Page 12 Implementation Results www.ti.com Figure 3-10. Output Hot Short Response (zoomed in) in TPS1685EVM (V = 54V, R = 1.1kΩ, R IMON IREF 40.2kΩ, R = 150kΩ, and C = 1mF) Note Make sure there is sufficient input capacitor to eliminate voltage dips at the input. A combination of electrolytic and ceramic capacitors are preferred.
- Page 13 = 1mF, and EN Pulled Low to 0V) 3.1.10 Thermal Performance of TPS1685EVM Use the following instructions to evaluate the thermal performance of TPS1685EVM: 1. Set the input supply voltage VIN to 54V and current limit of 50A. 2. Connect the power supply between VIN (connector T1) and PGND (connector T3) and enable the power supply.
- Page 14 Implementation Results www.ti.com V TEMP mV − 670 °C = 25 + 2.75 mV/°C The thermal performance of TPS1685EVM is shown in Figure 3-13. Figure 3-13. Thermal Performance of TPS1685EVM (V = 54V, I = 40A, T = 30°C, and No External Air...
- Page 15 U2: TAP points from inner portion of #22 for VIN and #7 for VOUT Figure 4-1. TPS1685EVMFuse Evaluation Board Schematic SLVUCW7A – SEPTEMBER 2024 – REVISED APRIL 2025 TPS1685 Evaluation Module for eFuse Submit Document Feedback Copyright © 2025 Texas Instruments Incorporated...
- Page 16 EVM schematic. Do not connect the various component grounds through the high current system ground line. TPS1685 Evaluation Module for eFuse SLVUCW7A – SEPTEMBER 2024 – REVISED APRIL 2025 Submit Document Feedback Copyright © 2025 Texas Instruments Incorporated...
- Page 17 The component placements of the EVM are shown in Figure 4-2 Figure 4-3. Figure 4-2. TPS1685EVM Board: Top Assembly Figure 4-3. TPS1685EVM Board: Bottom Assembly Note Analog signal nets, such as IREF, IMON, and TEMP, must be routed away as much as possible from power nets, such as VIN, VOUT, and PGND.
- Page 18 Hardware Design Files www.ti.com 4.3 Bill of Materials (BOM) The EVM BOM is listed in Table 4-1. Table 4-1. TPS1685EVM Bill of Materials Designator Quantity Value Description Footprint Part Number Manufacturer !PCB1 Printed Circuit Board LP113 C5, C25 0.1uF CAP, CERM, 0.1uF, 100V, +/- 10%, X5R, 0402 0402...
- Page 19 Hardware Design Files Table 4-1. TPS1685EVM Bill of Materials (continued) Designator Quantity Value Description Footprint Part Number Manufacturer Header, 100mil, 3x2, Tin, TH SULLINS_PEC03DAAN PEC03DAAN Sullins Connector Solutions J2, J3, J4, J5, J6, J7 FP-PEC02DABN_HDR4- PEC02DABN Sullins Connector Solutions Q1, Q2, Q3 N-Channel 30V 3.16A (Ta) 750mW (Ta)
- Page 20 Hardware Design Files www.ti.com Table 4-1. TPS1685EVM Bill of Materials (continued) Designator Quantity Value Description Footprint Part Number Manufacturer R36, R41, R44, R46, RES, 0, 5%, 0.063 W, AEC-Q200 Grade 0, 0402 CRCW04020000Z0ED Vishay-Dale R48, R49, R51 0402 R38, R39, R40 RES, 470, 5%, 0.1 W, 0603...
- Page 21 Updated with latest board image........................• Corrected device drain-source ON-resistance from 4.3mΩ to 3.65mΩ..............2 • Updated with latest EVM schematic......................... SLVUCW7A – SEPTEMBER 2024 – REVISED APRIL 2025 TPS1685 Evaluation Module for eFuse Submit Document Feedback Copyright © 2025 Texas Instruments Incorporated...
- Page 22 STANDARD TERMS FOR EVALUATION MODULES Delivery: TI delivers TI evaluation boards, kits, or modules, including any accompanying demonstration software, components, and/or documentation which may be provided together or separately (collectively, an “EVM” or “EVMs”) to the User (“User”) in accordance with the terms set forth herein.
- Page 23 www.ti.com Regulatory Notices: 3.1 United States 3.1.1 Notice applicable to EVMs not FCC-Approved: FCC NOTICE: This kit is designed to allow product developers to evaluate electronic components, circuitry, or software associated with the kit to determine whether to incorporate such items in a finished product and software developers to write software applications for use with the end product.
- Page 24 www.ti.com Concernant les EVMs avec antennes détachables Conformément à la réglementation d'Industrie Canada, le présent émetteur radio peut fonctionner avec une antenne d'un type et d'un gain maximal (ou inférieur) approuvé pour l'émetteur par Industrie Canada. Dans le but de réduire les risques de brouillage radioélectrique à...
- Page 25 www.ti.com EVM Use Restrictions and Warnings: 4.1 EVMS ARE NOT FOR USE IN FUNCTIONAL SAFETY AND/OR SAFETY CRITICAL EVALUATIONS, INCLUDING BUT NOT LIMITED TO EVALUATIONS OF LIFE SUPPORT APPLICATIONS. 4.2 User must read and apply the user guide and other available documentation provided by TI regarding the EVM prior to handling or using the EVM, including without limitation any warning or restriction notices.
- Page 26 Notwithstanding the foregoing, any judgment may be enforced in any United States or foreign court, and TI may seek injunctive relief in any United States or foreign court. Mailing Address: Texas Instruments, Post Office Box 655303, Dallas, Texas 75265 Copyright © 2023, Texas Instruments Incorporated...
- Page 27 TI products. TI’s provision of these resources does not expand or otherwise alter TI’s applicable warranties or warranty disclaimers for TI products. TI objects to and rejects any additional or different terms you may have proposed. IMPORTANT NOTICE Mailing Address: Texas Instruments, Post Office Box 655303, Dallas, Texas 75265 Copyright © 2025, Texas Instruments Incorporated...
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