Protection Circuit V1

1 month ago

Profile:Under voltage, over voltage, and over current protection circuit design for 5V atmega IC.

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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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Protection Circut V1

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BOM

ID Name Designator Footprint Quantity BOM_Manufacturer Part BOM_Manufacturer BOM_Supplier BOM_Supplier Part Price BOM_JLCPCB Part Class
1 100nF C1,C2 C0805 2 CL21F104ZBCNNNC SAMSUNG LCSC C1760 0.008 Extended Part
2 DC-003A-2A-1.3 DC1 DC-IN-TH_DC-003A-2A-1.3 1 DC-003A-2A-1.3 XKB Enterprise LCSC C388624 0.065 Extended Part
3 nSMD005 F1 F1206 1 nSMD005 TECHFUSE LCSC C70064 0.037 Extended Part
4 2N7002K-T1-GE3 Q1 SOT-23-3_L2.9-W1.6-P1.90-LS2.8-BR 1 2N7002K-T1-GE3 VISHAY LCSC C81445 0.096 Extended Part
5 BSP372NH6327 Q2 SOT-223-4_L6.5-W3.5-P2.30-LS7.0-BR 1 BSP372NH6327 Infineon Technologies LCSC C501499 0.657 Extended Part
6 LOAD R1 R0805_NEW 1 RC0805FR-07100KL YAGEO LCSC C96346 0.003 Extended Part
7 100K R2,R3,R4 R0805_NEW 3 RC0805FR-07100KL YAGEO LCSC C96346 0.003 Extended Part
8 30.9K R9 R0805 1 CR0805-FX-3092ELF BOURNS LCSC C204398 0.013 Extended Part

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