The MAX5921A evaluation kit (EV kit) is a fully assembled and tested surface-mount circuit board that provides current-limiting and multilevel fault protection using the MAX5921A hot-swap controller. The EV kit demonstrates the autoretry, configurable input undervoltage, overvoltage, and overcurrent monitoring features of the MAX5921A. The MAX5921A controls an external N-channel MOSFET to provide load-current regulation.
The EV kit circuit undervoltage and overvoltage thresholds are configured to -32V and -80V, respectively, which makes the EV kit well suited for -48V telecom systems. The input operating voltage range is -20V to -80V (-48V rail systems). The EV kit is designed to withstand
-100V input transients. The current-limiting threshold is configured for 1.8A output current.
The EV kit can also be used to evaluate different versions of the MAX5920, MAX5921, or MAX5939 hot-swap controllers after removing the MAX5921A.
The MAX5920A/B are pin- and function-compatible with the LT4250 hot-swap controllers and pin-compatible with LT1640.
Warning: The MAX5921A EV kit is designed to operate with high voltages. Dangerous voltages are present on this EV kit and on equipment connected to it. Users who power up this EV kit or power the sources connected to it must be careful to follow safety procedures appropriate to working with high-voltage electrical equipment.
Under severe fault or failure conditions, this EV kit may dissipate large amounts of power, which could result in the mechanical ejection of a component or of component debris at high velocity. Operate this kit with care to avoid possible personal injury.
The EV kit user should not probe the circuit with an oscilloscope probe and ground clip unless they have "high-voltage, hot-swap experience."