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48V Starter Generator

Best-in-class Automotive Power Modules (APMs), automotive MOSFETs, and automotive Gate Drivers allow customers to maximize power density, efficiency and reliability for their 48V Belt Starter Generator (BSG) and Integrated Starter Generator (ISG) designs. Customers can design BSG and ISG power stages that address 5kW up to 25+kW for 48V Mild Hybrid Electric Vehicles (MHEV) using ON Semiconductor solutions.

Mild Hybrid Electric Vehicles (MHEV) are an interim step in the evolution from the internal combustion engine (ICE) to Electric Vehicles (EV). MHEVs reduce the average CO2 emissions from vehicles by adding a BSG/ISG to augment the standard ICE, do not require any type of charging from the electrical grid, and maintain consumer expectations for vehicle performance. An MHEV achieves this functionality by converting to a dual battery system that provides a 12V battery and a 48V lithium-ion battery. MHEVs also implement a medium voltage to low voltage (48V to 12V) DCDC module to charge the 12V battery.

The 48V lithium-ion battery supplies the BSG or ISG inverter power stage and the 12V battery powers other existing 12V modules. The 12V battery can also be used as an alternate power source for the low power electronics in a 48V module. The BSG or ISG is capable of start-stop functionality, electric drive, electric boost, and regenerative power to the 48V battery while coasting or braking depending on implementation within the automotive powertrain. The typical power output range for a BSG is 5kW to 12+kW, and an ISG is 5kw to 25+kW. Classification of the BSG and ISG is not enough by name alone. There are locations designated as P0, P1, P2, P3 and P4 on the vehicle and these positions affect the method for mechanical connection, system efficiencies and losses, and functional capabilities of the BSG or ISG. While a BSG will be limited to lower power levels due to the mechanical connection of the belt, an ISG unit is capable of higher power levels because it does not have this belt limitation. An ISG either links directly to the ICE crankshaft, the input shaft of the transmission through a belt, vehicle transmission through a gear mesh, or the rear axle system through a gear mesh. BSG and ISG modules use air or liquid cooling to help with thermal management.

ON Semiconductor provides the best solutions to address your system requirements. Our premier automotive product portfolio for BSG and ISG covers Automotive Power Modules (APM), MOSFETs, Gate Drivers, In-Vehicle Networking (LIN, CAN, CAN-FD), analog signal chain (OpAmps, current shunt amplifiers, comparators), power supply ICs and System Basis Chips (SBCs).

Isolated Auxiliary Power Reference Designs
SECO-HVDCDC1362-15W-GEVB: 15W High Voltage Auxiliary Power Supply for EV Using Primary Side Regulation (PSR) and SiC Technology
This is a highly efficient primary side regulated (PSR) auxiliary power supply targeting HEV and EV automotive applications. The design provides 15W total output power with a stable 15V output. The wide input DC voltage range of 250V to 900V makes this design suitable for 400V and 800V battery systems.
SECO-HVDCDC1362-40W-GEVB: 40W High Voltage Auxiliary Power Supply for EV Using Primary Side Regulation (PSR) and SiC Technology
This is a highly efficient primary side regulated (PSR) auxiliary power supply targeting HEV and EV automotive applications. The design provides 40W total output power with a stable 15V output. The wide input DC voltage range of 250V to 900V makes this design suitable for 400V and 800V battery systems.
Interactive Block Diagrams
Power MOSFET Products for 48V BSG/ISG Systems
80V, 100V & 150V Power MOSFETs - Automotive
Automotive power MOSFETs for 48V battery systems
80V & 100V APMs - Automotive Power Modules (CONTACT LOCAL SALES)
Automotive Power Modules (APMs) for 48V battery systems. APM options in transfer mold packaging improve thermal performance, allow faster switching, reduce stray inductance and provide superior package warp control under stress.
Gate Drivers & Gate Drive Power Supplies for 48V BSG/ISG Systems
Junction Isolated Gate Drivers - Automotive
Automotive junction isolated gate drivers for BSG/ISG
NCV3064 Automotive Controller for Isolated Gate Drive Supply
Automotive isolated gate driver supply
NCV1397 Automotive Controller for Isolated Gate Drive Supply
Automotive isolated gate driver supply
Power Supplies and In-Vehicle Networking (IVN) for BSG/ISG Systems
NCV1362 Automotive Controller for Isolated Auxiliary Supply
Automotive isolated auxiliary power supply
LDO Regulators - Automotive
Automotive LDO regulators for pre-regulation and post-regulation
Automotive In-Vehicle Networking (IVN)
Automotive System Basis Chips (SBC) & stand-alone CAN, CAN-FD and LIN Transceivers
80V, 100V & 150V MOSFETs - Automotive
General automotive MOSFETs for 48V battery systems.
40V MOSFETs - Automotive
General automotive MOSFETs for 12V battery systems.
ESD Protection for CAN, CAN-FD & LIN
Automotive ESD protection for communication in BSG/ISG
Analog Signal Chain for BSG/ISG Systems
Current Sense Amplifiers (CSA) - Automotive
Automotive current sense amplifiers for BSG/ISG
NCV2191x Precision OpAmps - Automotive
Automotive precision opamps with zero-drift, low noise and 2MHz BW in 1,2 and 4 channel options
Comparators - Automotive
Automotive comparators for BSG/ISG
NVT211 I2C Digital Temperature Sensor - Automotive
I2C digital temperature sensor for monitoring board temperature in BSG/ISG
NCV431 Voltage Reference - Automotive
Automotive voltage reference for high accuracy ADC measurements
Isolated Auxiliary Power - Orderable
SECO-HVDCDC1362-15W-GEVB: 15W High Voltage Auxiliary Power Supply for EV Using Primary Side Regulation (PSR) and SiC Technology
This is a highly efficient primary side regulated (PSR) auxiliary power supply targeting HEV and EV automotive applications. The design provides 15W total output power with a stable 15V output. The wide input DC voltage range of 250V to 900V makes this design suitable for 400V and 800V battery systems.
SECO-HVDCDC1362-40W-GEVB: 40W High Voltage Auxiliary Power Supply for EV Using Primary Side Regulation (PSR) and SiC Technology
This is a highly efficient primary side regulated (PSR) auxiliary power supply targeting HEV and EV automotive applications. The design provides 40W total output power with a stable 15V output. The wide input DC voltage range of 250V to 900V makes this design suitable for 400V and 800V battery systems.
Isolated Gate Driver Power - Orderable
SECO-LVDCDC3064-IGBT-GEVB: 6V to 18V Input Isolated IGBT Gate Driver Supply Using the NCV3064 Automotive Qualified Controller
This reference design enables a low component count, compact form factor and robust performance for an isolated gate driver supply for IGBTs. The output voltage rails are −7.5V / 15V for efficient switching as well as an additional 7.5V rail with an input voltage range of 6V to 18V. The converter is implemented as a primary side regulated (PSR) flyback, with the feedback loop signal (1.25 V) realized via an auxiliary winding regulated at 5 V and a voltage divider.
SECO-LVDCDC3064-SIC-GEVB: 6V to 18V Input Isolated SiC Gate Driver Supply Using the NCV3064 Automotive Qualified Controller
This reference design enables a low component count, compact form factor and robust performance for an isolated gate driver supply for SiC MOSFETs. The output voltage rails are −5.0V / 20V for efficient switching as well as an additional 5.0V rail with an input voltage range of 6V to 18V. The converter is implemented as a primary side regulated (PSR) flyback, with the feedback loop signal (1.25 V) realized via an auxiliary winding regulated at 5V and a voltage divider.
Featured Videos


APM17M Modules for 48V Systems & 25kW BSG / ISG Reference Design

A brief overview of APM17M Automototive Power Modules and the 25kW BSG / ISG Reference Design



Mild Hybrid Topologies - 48V Solutions

Mild Hybrid Electric Vehicles (MHEV) Discussion on the Design of 48V Systems

Featured Blogs
New Auxiliary Power Supply Solutions for Vehicle Electrification
Auxiliary power in automotive applications using the NCV1362 and NCV3064 controllers.
Automotive Discrete MOSFETS: A Competitive Differentiator
AEC-Q101 MOSFETs and packaging options for 48V automotive applications.
48V Technology for Mild Hybrid Construction and Mining Machinery
How the mild hybrid electric vehicle (MHEV) architecture can benefit heavy equipment.
Electrification of Agricultural Vehicles
Mild hybrid and high voltage hyrid solutions for agriculture.

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