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STD Protection Circuit V1

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Update time: 2021-10-19 01:39:32
Creation time: 2021-10-19 01:10:29
Description

This circuit is designed to accomplish over voltage protection, under voltage protection, and over current protection using simple components.  The circuit is designed to protect an atmega328P or other similar 5V microcontroller.  There is a enhancement mosfet (Q1) which is normally open and closes when the gate reaches at least 2V.  There is a voltage divider (R4 and R2) which makes it so this mosfet will only close when the input voltage increases over 4V.  There is a depletion mosfet (Q2) which is normally closed and opens when the gate reaches at least 1.8V.  The voltage divider (R3 and R9) make it so this mosfet opens when the voltage increases over 5.8V, thus protecting the circuit.  I chose a resettable fuse with a 150 mA trip current to protect the circuit from a short.

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ID Name Designator Footprint Quantity BOM_Supplier BOM_Manufacturer Part BOM_Manufacturer BOM_Supplier Part BOM_JLCPCB Part Class
1 100nF C1,C2 C0805 2 LCSC CL21F104ZBCNNNC SAMSUNG C1760 Extended Part
2 DC-003A-2A-1.3 DC1 DC-IN-TH_DC-003A-2A-1.3 1 LCSC DC-003A-2A-1.3 XKB Enterprise C388624 Extended Part
3 nSMD005 F1 F1206 1 LCSC nSMD005 TECHFUSE C70064 Extended Part
4 2N7002K-T1-GE3 Q1 SOT-23-3_L2.9-W1.6-P1.90-LS2.8-BR 1 LCSC 2N7002K-T1-GE3 VISHAY C81445 Extended Part
5 BSP372NH6327 Q2 SOT-223-4_L6.5-W3.5-P2.30-LS7.0-BR 1 LCSC BSP372NH6327 Infineon Technologies C501499 Extended Part
6 LOAD R1 R0805_NEW 1 LCSC RC0805FR-07100KL YAGEO C96346 Extended Part
7 100K R2,R3,R4 R0805_NEW 3 LCSC RC0805FR-07100KL YAGEO C96346 Extended Part
8 30.9K R9 R0805 1 LCSC CR0805-FX-3092ELF BOURNS C204398 Extended Part

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