On Board Charger (OBC)

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Scalable 7–22 kW OBC Solutions

Discover power electronics that enable charging EVs at home with OBC solutions. Comprehensive guide with development advice and product recommendations focused on OBC design and architectures.

Solution Guide
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Enable Fast and Efficient EV Charging

On Board Charger (OBC) is used to charge the high voltage battery pack of Battery Electric Vehicles (BEV) and Plugin Hybrid Electric Vehicles (PHEV). It is integrated directly into the vehicle's design and enables the conversion of AC power from the grid into DC power suitable for the vehicle's battery pack. This technology allows EV owners to conveniently recharge their vehicles at home or at public charging stations.

The best in class automotive power semiconductors, including EliteSiC MOSFETs, EliteSiC diodes, silicon Super-Junction (SJ) MOSFETs, hybrid IGBTs, and Automotive Power Modules (APMs), enable customers to maximize power density, efficiency, and reliability for their OBC designs. Customers can design OBC power stages that address 3.3 kW up to 22 kW and battery voltages up to 800 V using onsemi solutions. Galvanically isolated gate drivers can be paired with any power switch and chosen topology for PFC and DC/DC power stages. onsemi designed specialized gate drivers to complement EliteSiC MOSFET range and ensure optimized efficiency and reliability for high-power OBC.

Products

SiC MOSFETs
EliteSiC discrete MOSFETs deliver low switching and conduction losses at high voltage. Compare devices by voltage, resistance, package and generation.
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SiC Modules
SiC power modules integrate MOSFETs, diodes and selected sensing features. Multiple topologies simplify efficient high-power conversion designs.
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Gate Drivers
GaN, IGBT, FET, MOSFET, H-Bridge MOSFET, and SiC MOSFET inverting and non-inverting drivers ideal for switching applications.
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Standard Products
Standard Products provide reliable, cost‑effective semiconductor solutions for industrial, automotive and consumer designs. The portfolio includes LDOs, amplifiers, comparators, logic, EEPROMs and isolation devices, many built on the scalable Treo platform to deliver long‑term availability, consistent quality and faster time to market.
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MOSFET Modules
MOSFET Modules are used for automotive motor drive and on-board charger applications. They come in 40 V, 60 V, 80 V and 650 V ratings with superjunction technology and sense resistor. Aside from the six-pack and the full and half bridge topology, they are also available in the totem pole PFC topology.
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IGBTs
Insulated Gate Bipolar Transistors (IGBTs) that offer maximum reliability in high performance power conversion applications.
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Ethernet Controllers
IEEE-compliant ethernet controllers designed for robust communication in a wide range of environments and applications.
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ESD Protection Diodes
Protection diodes and arrays that are specifically designed to provide ESD and surge protection.
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High Voltage MOSFETs
Portfolio of high voltage super-junction (SJ) MOSFETs meant for general usage and for several applications such as Power Factor correction, server/telecom power, led lighting.
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Documents

White Papers
onsemi EliteSiC M3S Technology for High-Speed Switching Applications
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Application Notes
onsemi EliteSiC Gen 2 1200 V SiC MOSFET M3S Series
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White Papers
High Temperature Analog and Mixed‐Signal Solutions Enabled by the Treo Platform
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Application Notes
Practical Design Guidelines on the Usage of an Isolated Gate Driver
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White Papers
onsemi EliteSiC 650 V SiC MOSFET M3S Series with Superior Switching Performance
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Application Notes
Top Cool Package for Power Discrete MOSFETs
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Application Notes
Introduction to 1200 V SiC MOSFET Modules for On-Board Charger Applications: NVXK2KR80WDT, NVXK2TR80WDT, & NVXK2TR40WDT
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Evaluation Boards/Kits

Evaluation Board
EVBUM2897G-EVB
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Evaluation Kit
EVBUM2909G-EVK
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Evaluation Board
P90024EVB
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Evaluation Board
EVBUM2878G-EVB
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Evaluation Board
NCP-NCV51152TO2474LGEVB
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Evaluation Board
P90022EVB
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Evaluation Board
NCP-NCV51561TO2474LGEVB
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Evaluation Board
NCP-NCV51563D2PAK7LGEVB
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Design Resources

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FAQs

onsemi provides scalable OBC solutions for 7–22 kW, supporting EV charging from AC to high‑voltage battery packs. Designs span ~3.3 kW up to 22 kW and battery voltages from 400 V up to 800 V, covering key PFC + DC‑DC power stages with discretes and automotive power modules.

APM32 EliteSiC automotive power modules are positioned for 11–22 kW OBC stages and 800 V class systems using 1200 V SiC devices. For the bridgeless PFC stage, the 3-Phase bridge modules are recommended. Full Bridge and Dual Half Bridge modules are suitable for DC-DC stage. The modules note robustness from –40 °C to 175 °C operation and automotive qualification (incl. AEC‑Q101 / AQG‑324).

NCV51563 and NCV51752 are recommended isolated gate drivers for SiC power stages in OBC, designed for fast switching with protection features. The drivers enable negative OFF gate bias control to reduce parasitic turn‑on risk in high dV/dt half‑bridges, improving robustness.

The OBC solutions bundle system solution guide and practical resources: design notes, block diagrams (incl. OBC + DC/DC), evaluation resources and simulation support (Elite Power Simulator). These tools help engineers shortlist parts and streamline their application design.

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