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High Accuracy Adjustable Overvoltage and Overcurrent Protectors using MAX17561

If you need safe power to run your project, then this circuit is a possible solution for you. This project provides protection to your system device against over-current, over-voltage, under-voltage, thermal overload, and reverse current flow control to the system device. Basically, this project can play a key role between the power supply and the sensitive system device, where the system device will be protected against the above conditions. When there is a change other than the set parameters the circuit will disable the output and go in retry mode, until the condition is as per the set value. The project is built using MAX17561 chip. Refer to the datasheet to get further information. Refer to the schematic shown below and have look at some of the panorama of the project explained below.

Important Features:

- Adjustable overvoltage protection range is between 6V and 36V
- Adjustable undervoltage protection range is between 4.5V and 24V
- Overvoltage-lockout (OVLO) thresholds are set using external resistors R1 and R7
- Undervoltage-lockout (UVLO) thresholds are set using external resistors R2 and R8
- Programmable Forward-Current Limit: 0.7A to 4.2A (±15% Accuracy) is set using R9 (R9 13K = Approx. 1Amp)
- Reverse Current Flow Control Input
- Thermal Overload Protection
- Dual Enable Inputs: EN and High Voltage HVEN
- Fault Indicator Output. FLAG goes low when the fault duration exceeds the blanking time, reverse current is detected, the thermal-shutdown mode is active, OVLO threshold is reached, or SET-Current is connected to GND.
- Reverse-Current Enable Input. Open the Jumper J3 enables reverse-current flow protection. Close the Jumper J3 (RIEN to logic-high) to disable the reverse-current flow protection
- EN: Close the Jumper J2 to enable the input (Active-High Enable Input)
- HVEN: Close the Jumper J1 to activate HVEN High voltage Enable (36V Capable Active-Low Enable Input)
- PCB dimensions: 70.01 x 51.28 mm”

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