Find the perfect block diagram with our step-by-step guide below. Start by choosing a solution,
then refine your selection as the next fields adapt dynamically to lead you to the final diagram.
Expanded View
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Monitor","path":"/design/interactive-block-diagrams/medical/continuous-glucose-monitor","children":[]},{"id":"f6130e35-4fd0-4719-acac-e3da45c1a9a6_IBD_DIAGRAM","parentId":"232a1fe1-c60b-4a4f-853e-7b73a7209c91_IBD_SUBSOLUTION","text":"Hearing Aid","path":"/design/interactive-block-diagrams/medical/hearing-aid","children":[]},{"id":"a3e4f792-c0dc-4153-bb76-59bbe623ed64_IBD_DIAGRAM","parentId":"232a1fe1-c60b-4a4f-853e-7b73a7209c91_IBD_SUBSOLUTION","text":"Patient Monitor","path":"/design/interactive-block-diagrams/medical/patient-monitor","children":[]},{"id":"fa0c8829-c8b8-426a-8624-fb6406550d0b_IBD_DIAGRAM","parentId":"232a1fe1-c60b-4a4f-853e-7b73a7209c91_IBD_SUBSOLUTION","text":"Ultrasound Transducer","path":"/design/interactive-block-diagrams/medical/ultrasound-transducer","children":[]}]},{"id":"d17e7410-a519-48f1-887a-1644e3a10c78_IBD_SUBSOLUTION","parentId":"9d330931-7485-49dd-ae21-990ea4e17af9_IBD_SOLUTION","text":"Medical Imaging","path":null,"children":[{"id":"7780a3f3-3fe2-4f1c-a8f4-f873ed853c45_IBD_DIAGRAM","parentId":"d17e7410-a519-48f1-887a-1644e3a10c78_IBD_SUBSOLUTION","text":"Digital Radiography","path":"/design/interactive-block-diagrams/medical/digital-radiography","children":[]}]}]}]

Power Distribution Unit 48V - Block Diagram

48V power distribution unit is used to provide power for automotive loads like Compressor, Electric Power Steering, EV Battery Heating/Cooling, etc.

"longDescription": "Detailed Description of Each Block", "blocks": [ { "name": "HV-48V DC-DC Converter", "function": "Converts high voltage (HV) from the main battery to 48V for auxiliary systems.", "theory_of_operation": "Uses switching regulators to step down the voltage efficiently.", "interaction": "Supplies 48V power to the 48V Power Bus.", "category": "Third party", "connection": [ "Primary Protection Side" ] }, { "name": "48V Power Bus", "function": "Distributes 48V power to various subsystems.", "theory_of_operation": "Acts as a common power distribution point.", "interaction": "Feeds power to the Discrete Disconnect and Ideal Diode Controller blocks.", "category": "Third party", "connection": [ "Primary Protection Side" ] }, { "name": "Primary Protection Side", "sub_blocks": [ { "name": "Discrete Disconnect", "function": "Provides a means to disconnect the power supply for safety.", "theory_of_operation": "Uses mechanical or solid-state relays to open or close the circuit.", "interaction": "Connects Power Supply to the load.", "category": "onsemi", "connection": [] }, { "name": "Ideal Diode Controller", "function": "Controls the operation of the ideal diode to prevent reverse current flow.", "theory_of_operation": "Uses MOSFETs to act as an ideal diode with low forward voltage drop.", "interaction": "Connected to the Discrete Disconnect, Power Discretes, SmartFET and Auxiliary Power blocks.", "category": "Third Party", "connection": [] } ], "connection": [ "Load Drivers", "SmartFET", "Auxiliary Power" ] }, { "name": "MCU", "function": "Central control unit that manages the overall system.", "theory_of_operation": "Executes firmware to control various subsystems.", "interaction": "Interfaces with Discrete Disconnect, Ideal Diode Controller, Communication, Auxiliary Power, Sensing, and MCU Interface blocks.", "category": "Third party", "connection": [ "Primary Protection Side", "Communication", "Auxiliary Power", "Sensing", "MCU Interface", "SmartFET" ] }, { "name": "Communication", "sub_blocks": [ { "name": "In Vehicle Networking", "function": "Manages communication within the vehicle.", "theory_of_operation": "Uses Ethernet, CAN and LIN protocols for data exchange.", "interaction": "Connects various systems within the vehicle.", "category": "onsemi", "connection": [] }, { "name": "ESD Protection", "function": "Protects against electrostatic discharge.", "theory_of_operation": "Uses diodes and other components to shunt ESD to ground.", "interaction": "Connected to the MCU.", "category": "onsemi", "connection": [] } ], "connection": [ "MCU" ] }, { "name": "Auxiliary Power", "sub_blocks": [ { "name": "Buck", "function": "Steps down voltage to a lower level.", "theory_of_operation": "Uses inductors, capacitors, and switches to convert voltage efficiently.", "interaction": "Connected to the MCU supplies low voltage.", "category": "onsemi", "connection": [] }, { "name": "LDO", "function": "Provides low dropout voltage regulation.", "theory_of_operation": "Uses a pass transistor and feedback loop to regulate voltage.", "interaction": "Connected to the MCU.", "category": "onsemi", "connection": [] } ], "connection": [ "MCU" ] }, { "name": "Sensing", "sub_blocks": [ { "name": "Current Sense", "function": "Measures current flow.", "theory_of_operation": "Uses shunt resistors or Hall effect sensors to detect current.", "interaction": "Connected to the MCU.", "category": "onsemi", "connection": [] }, { "name": "Voltage Supervisory", "function": "Monitors voltage levels.", "theory_of_operation": "Uses comparators and reference voltages to detect anomalies.", "interaction": "Connected to the MCU.", "category": "onsemi", "connection": [] } ], "connection": [ "MCU" ] }, { "name": "MCU Interface", "sub_blocks": [ { "name": "EEPROM", "function": "Provides non-volatile memory storage.", "theory_of_operation": "Uses transistors to store data.", "interaction": "Connected to the MCU.", "category": "onsemi", "connection": [] }, { "name": "Interface Components", "function": "Facilitates communication between the MCU and other components.", "theory_of_operation": "Uses various interface protocols and components.", "interaction": "Connected to the MCU.", "category": "onsemi", "connection": [] } ], "connection": [ "MCU" ] }, { "name": "Load Drivers", "connection": [], "sub_blocks": [ { "name": "Power Discretes", "function": "Provides high-power switching components.", "theory_of_operation": "Uses MOSFETs, IGBTs, or other power semiconductors.", "interaction": "Connected to the Gate Driver.", "category": "onsemi", "connection": [] }, { "name": "Gate Driver", "function": "Drives the gates of power semiconductors.", "theory_of_operation": "Provides the necessary voltage and current to switch power transistors on and off.", "interaction": "Connected to the Power Discretes block and MCU.", "category": "onsemi", "connection": [] } ] }, { "name": "SmartFET", "function": "Provides intelligent control of power MOSFETs.", "theory_of_operation": "Uses integrated circuits for enhanced functionality and protection.", "interaction": "Connected to the Power Discretes block.", "category": "Third Party", "connection": [] } ], "interconnections": [ { "source": "HV-48V DC-DC Converter", "target": "Primary Protection Side" }, { "source": "48V Power Bus", "target": "Primary Protection Side" }, { "source": "Primary Protection Side", "target": "Load Drivers" }, { "source": "Primary Protection Side", "target": "SmartFET" }, { "source": "Primary Protection Side", "target": "Auxiliary Power" }, { "source": "MCU", "target": "Primary Protection Side" }, { "source": "MCU", "target": "Communication" }, { "source": "MCU", "target": "Auxiliary Power" }, { "source": "MCU", "target": "Sensing" }, { "source": "MCU", "target": "MCU Interface" }, { "source": "MCU", "target": "SmartFET" }, { "source": "Communication", "target": "MCU" }, { "source": "Auxiliary Power", "target": "MCU" }, { "source": "Sensing", "target": "MCU" }, { "source": "MCU Interface", "target": "MCU" } ], "Last_update": "2025-07-30",

Power Distribution Unit 48V

EEPROM - Block

Products

  • EEPROM
    • CAV25010

      EEPROM Serial 1-Kb SPI - Automotive Grade

    • CAV24C04

      EEPROM Serial 4-Kb I<sup>2</sup>C - Automotive Grade

    • CAV24C512

      EEPROM Serial 512-Kb I<sup>2</sup>C - Automotive Grade

    • NV25320

      EEPROM Serial 32-Kb SPI - Automotive Grade 0 (+150°C)

    • NV24M01MUW

      EEPROM Serial 1-Mb I<sup>2</sup>C - Automotive Grade

    • NV25M01

      EEPROM Serial 1-Mb SPI - Automotive Grade

    • CAV24M01

      EEPROM Serial 1-Mb I<sup>2</sup>C - Automotive Grade

    • NV25010

      EEPROM Serial 1-Kb SPI - Automotive Grade 0 (+150°C)

    • CAT25M01

      EEPROM Serial 1-Mb SPI

Technical Documentation

Evaluation Boards/Kits

FAQs

1. Why are vehicles adopting 48 V power distribution systems?

Vehicles adopt 48 V systems to support higher power demands while reducing current and wiring losses. A 48 V architecture enables efficient operation of electrified functions such as electric turbochargers, active chassis systems, and mild hybrid features without the complexity of full high‑voltage EV systems.

2. What functions does a 48 V PDU perform in a vehicle?

A 48 V PDU performs controlled power distribution, load switching, and circuit protection for high‑power subsystems. It monitors current and voltage, isolates faults, and enables intelligent power management to improve system reliability, diagnostics, and overall vehicle electrical efficiency.

3. What vehicle applications are powered by a 48 V PDU?

48 V PDU powers applications such as electric compressors, pumps, fans, active suspension, and starter‑generator systems. These loads benefit from higher voltage operation, which reduces current levels, supports compact designs, and enables efficient delivery of increased electrical power.

4. What role do MOSFETs and smart switches play in a 48 V PDU?

MOSFETs and smart switches act as electronically controlled power paths within the 48 V PDU. They enable fast switching, current sensing, and fault protection, supporting precise load control and reliable operation under high‑power and transient automotive conditions.

5. How does the onsemi Interactive Block Diagram help me select parts and build a worksheet/BOM?

The onsemi interactive block diagram lets you select a taxonomy, choose devices per block, and download a worksheet. If you need a deeper dive into the tool, watch our tutorial video.

Worksheet (BOM) Preview

Worksheet (BOM)

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