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":[]}]}]}]

DC-DC Converter 48V-12V - Block Diagram

48V to 12V DC-DC converter is used to convert 48V battery voltage to lower 12V battery voltage in BEV and MHEV electric vehicles.

"longDescription": "Detailed Description of Each Block", "blocks": [ { "name": "48V Battery", "connection": [ "Non-Isolated Power Stage", "Auxiliary Power" ] "sub_blocks": [ { "name": "Battery 48V", "function": "", "theory_of_operation": "", "interaction": "", "category": "Third Party", "connection": [] }, { "name": "Disconnect Switch 48V", "function": "Allows the disconnection of the 48V battery from the system.", "theory_of_operation": "Acts as a safety mechanism to isolate the battery.", "interaction": "Connected to the 48V Battery and 48V Filter.", "category": "onsemi", "connection": [] }, { "name": "48V Filter", "function": "Filters out noise and smooths the 48V DC power.", "theory_of_operation": "Uses passive components like capacitors and inductors to filter the power.", "interaction": "Connected to the Disconnect Switch 48V and Non-Isolated Power Stage.", "category": "Third Party", "connection": [] }, ] }, { "name": "Non-Isolated Power Stage", "connection": [ "48V Battery", "12V Battery", "Sensing" ], "sub_blocks": [ { "name": "Discreter MOSFETs", "function": "Middle Voltage (up to 100V) MOSFETs used in various topologies to convert power", "theory_of_operation": "Various Switches used to form a Bidirectional converter with input 48V and output 12V.", "interaction": "Connected to the 48V Filter, Disconnect Switch 12V, and Gate Drivers.", "category": "onsemi", "connection": [] }, { "name": "Power Module (APM)", "function": "MOSFETs Modules suitable for 48V systems", "theory_of_operation": "APM forms a Bidirectional converter with input 48V and output 12V", "interaction": "Connected to the 48V Filter, Disconnect Switch 12V, and Gate Drivers.", "category": "onsemi", "connection": [] } ] }, { "name": "12V Battery", "connection": [ "Non-Isolated Power Stage" ] "sub_blocks": [ { "name": "Disconnect Switch 12V", "function": "Allows for the disconnection of the 12V battery from the system.", "theory_of_operation": "Acts as a safety mechanism to isolate the battery.", "interaction": "Connected to the Non-Isolated Power Stage and 12V Battery.", "category": "onsemi", "connection": [] }, { "name": "Battery 12V", "function": "Provides a secondary power source for the system.", "theory_of_operation": "Supplies 12V DC power to the system.", "interaction": "Connected to the Disconnect Switch 12V.", "category": "Third Party", "connection": [] }, ] }, { "name": "Auxiliary Power Supply", "connection": [ "Gate Drivers Digital Isolation", "MCU", "MCU & Interface" ], "sub_blocks": [ { "name": "DC-DC Controllers & Converters", "function": "DC to DC converters converts input voltage and current levels to suitable ones.", "theory_of_operation": "Converts and regulates power for auxiliary functions.", "interaction": "Receives power from 48V battery and supplies whole system.", "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": "Receives power from 48V battery and supplies whole system.", "category": "onsemi", "connection": [] }, { "name": "Offline Controllers & Regulators", "function": "Manage the conversion of AC to DC.", "theory_of_operation": "They use Pulse Width Modulation (PWM) to control the switching of power transistors, regulating the output voltage and current.", "interaction": "Receives power from 48V battery and supplies whole system.", "category": "onsemi", "connection": [] }, { "name": "Auxiliary Power Protection", "function": "Protects auxiliary power supplies", "theory_of_operation": "Uses Zener Diodes, eFuses and Protected Power Switches to protect power supplies.", "interaction": "Connected to various power supplies such as DC-DC converters, LDO and offline regulators and controllers.", "category": "onsemi", "connection": [] } ] }, { "name": "Gate Drivers Digital Isolation", "function": "", "theory_of_operation": "", "interaction": "", "category": "onsemi", "connection": ["Non-Isolated Power Stage"] }, { "name": "MCU & Interface", "function": "", "theory_of_operation": "", "interaction": "", "category": "onsemi", "connection": ["MCU"] }, { "name": "MCU", "function": "", "theory_of_operation": "", "interaction": "", "category": "onsemi", "connection": ["MCU & Interface", "Auxiliary Power", "Gate Drivers Digital Isolation", "Communication"] }, { "name": "Sensing", "connection": ["MCU"], "sub_blocks": [ { "name": "Voltage & Current Sense", "function": "", "theory_of_operation": "", "interaction": "", "category": "onsemi", "connection": [] }, { "name": "Amplifiers Comparators", "function": "", "theory_of_operation": "", "interaction": "", "category": "onsemi", "connection": [] } ] }, { "name": "Communication", "connection": ["MCU"], "sub_blocks": [ { "name": "In-Vehicle Networking", "function": "", "theory_of_operation": "", "interaction": "", "category": "onsemi", "connection": [] }, { "name": "ESD Protection", "function": "", "theory_of_operation": "", "interaction": "", "category": "onsemi", "connection": [] } ] } ], "interconnections": [ {"source": "48V Battery", "target": "Non-Isolated Power Stage"}, {"source": "48V Battery", "target": "Auxiliary Power"}, {"source": "Non-Isolated Power Stage", "target": "48V Battery"}, {"source": "Non-Isolated Power Stage", "target": "12V Battery"}, {"source": "Non-Isolated Power Stage", "target": "Sensing"}, {"source": "12V Battery", "target": "Non-Isolated Power Stage"}, {"source": "Auxiliary Power", "target": "Gate Drivers Digital Isolation"}, {"source": "Auxiliary Power", "target": "MCU"}, {"source": "Auxiliary Power", "target": "MCU & Interface"}, {"source": "Gate Drivers Digital Isolation", "target": "Non-Isolated Power Stage"}, {"source": "MCU & Interface", "target": "MCU"}, {"source": "MCU", "target": "MCU & Interface"}, {"source": "MCU", "target": "Auxiliary Power"}, {"source": "MCU", "target": "Gate Drivers Digital Isolation"}, {"source": "MCU", "target": "Communication"}, {"source": "Sensing", "target": "MCU"}, {"source": "Communication", "target": "MCU"} ], "Last_update": "2025-07-30",

DC-DC Converter 48V-12V

Power Controllers - Block

Products

  • Controllers
    • NCV8871

      Non-Synchronous Boost Controller, Automotive Grade

    • NCV898031

      Non-Synchronous SEPIC / Boost Controller, 2 MHz

    • NCV12711

      Automotive Qualified 4-45 Vin DC/DC Peak Current Controller

    • NCV8856A

      Synchronous Buck Controller with adjustable output voltage. Drives dual N-channel MOSFETs. Input Supply Range 4.5 V to 38 V.

    • NCV81277A

      4/3/2/1 Phase Buck Controller with PWM_VID and I2C Interface

    • NCV881930

      Low Quiescent Current 410 kHz Automotive Synchronous Buck Controller

  • Converters
    • NCV97200

      Automotive Multi-Output Power Management IC (PMIC) for Safety Applications

  • Offline Controllers
    • NCV3843B

      Current Mode PWM Controller

    • NCV4390

      Automotive Advanced Secondary Side LLC Resonant Converter Controller with Synchronous Rectifier Control

    • NCV1362

      Automotive Primary Side PWM Controller for Low Power Offline SMPS

  • Offline Regulators
    • NCV1076-77

      Automotive High-Voltage Switching Regulator

    • NCV1060

      Automotive High-Voltage Switcher for low Power offline SMPS

    • NCV1063

      Automotive High-Voltage Switcher for low Power SMPS

Technical Documentation

Evaluation Boards/Kits

FAQs

1. Why are 48 V electrical systems used in modern vehicles?

48 V systems are used because they enable higher power delivery with lower current, reducing losses and cable size. They support electrified functions such as mild hybrid systems, electric compressors, and active chassis features while improving overall vehicle efficiency.

2. What role does the DC‑DC converter play in a 48 V vehicle architecture?

The DC‑DC converter acts as the bridge between the 48 V and 12 V domains. It ensures reliable power delivery to safety‑critical and legacy electronics while isolating voltage domains and maintaining system stability during load transients and operating mode changes.

3. Which vehicle loads are typically powered by the 12 V side?

The 12 V side typically powers infotainment systems, body electronics, lighting, ECUs, sensors, and safety systems. Maintaining a stable 12 V supply is critical because many vehicle functions and regulatory‑required systems still depend on this voltage level.

4. What are the main design challenges for automotive DC‑DC converters?

Key challenges include efficiency, thermal management, electromagnetic compatibility, and functional safety. Designers must handle high power density, wide input voltage ranges, and fast load changes while meeting automotive reliability and safety standards.

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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