The TPS25985EVM eFuse Evaluation Board allows reference circuit evaluation of Texas Instruments (TI) TPS25985 eFuse. The TPS25985 device is a 4.5-V to 16-V and 60-A (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. The TPS25985 eFuse has an integrated FET with ultra-low ON resistance of 0.59-mΩ, adjustable and robust overcurrent and short-circuit protections, precise load current monitoring, fast overvoltage protection (fixed 16.7-V threshold), adjustable output slew rate control for inrush current protection, and built-in overtemperature protection to ensure FET safe operating area (SOA). TPS25985 eFuse also has an adjustable overcurrent transient blanking timer to support load transients, adjustable under-voltage protection, integrated FET health monitoring, and reporting, analog die temperature monitor output, dedicated fault and power good indication pins, and an uncommitted general-purpose fast comparator.

TPS25985EVM comes with two (2) TPS25985 eFuses connected in parallel to evaluate a 12-V (typical) and 120-A (steady state) design. General TPS25985EVM eFuse evaluation board features include:

• 5-V to 16-V (typical) operation
• 28-A to 170-A programmable circuit breaker threshold using onboard jumpers

• Adjustable reference voltage for overcurrent protection and active current sharing blocks

• Adjustable output voltage slew rate control
• Adjustable transient current blanking timer

• Adjustable current limit during start-up and active current sharing threshold using onboard jumpers

• TVS diode for input and Schottky diode for output transient protections
• LED status for power good and fault indications

• Onboard test points and associated circuitry to implement the system level functionalities such as adjustable overvoltage protection, PROCHOT#™, load handshake, power good with adjustable thresholds, etc using the general-purpose comparator built into the TPS25985 eFuse

• Options to engage the enable power cycle and the quick output discharge (QOD)

• Option to apply custom load transients using onboard MOSFETs, gate drive circuit, and load resistors

This EVM can be used on the following applications:

• Input hotswap and hotplug
• Server and high performance computing
• Network interface cards
• Graphics and hardware accelerator cards
• Datacenter switches and routers
• Fan trays
• Switches/routers

The TPS25985EVM enables the evaluation of TPS259850x and TPS259851x eFuses from TPS25985 family. This EVM has two (2) TPS259850x eFuses connected in parallel. The input power is applied across the connectors T1 and T3, while T2 and T3 provide the output connection for the EVM; refer to the schematic in Figure 3-1 and EVM test setup in Figure 5-1. TVS diodes D1 and D2 provide the input protection from transient overvoltages. Schottky diodes D3 and D4 protect the output by clamping the negative voltage excursion at the OUT pins of TPS25985 eFuses within the maximum absolute rating.

SW1 allows to do the input power cycle and SW2 enables the quick output discharge (QOD). Power Good (PG) and fault (FLTb & FLTb2) indicators are provided by LED DG1, DR1, and DR2 respectively.