Introduction to ROHM Semiconductor's New PWM Controller ICs
ROHM Semiconductor has unveiled a new line of external FET-type PWM controller integrated circuits (ICs) designed to meet the rigorous demands of industrial applications. These controllers utilize PWM current control mode and have recently entered mass production. This new product lineup includes four distinct variants tailored for various power semiconductor requirements, aiming to optimize AC-DC power supplies for industrial use.
Challenges in the Semiconductor Market
The ongoing global semiconductor shortage has impacted supply chains significantly. Despite signs of easing, the availability of semiconductor components, particularly for power supplies in industrial sectors, remains strained. PWM controller ICs are among the most affected due to the limited number of manufacturers in the market, leading to delays in product development requests.
Innovations in PWM Controller ICs
To combat the supply challenges, ROHM has released a series of PWM controller ICs that align with the stringent packaging and performance standards demanded by the industrial market. Depending on the application's input AC voltage range, a diverse array of semiconductors is employed in power supply circuits. These semiconductors require specific undervoltage lockout (UVLO) levels to mitigate thermal runaway risks caused by supply or gate voltage drops. ROHM’s new variants cater to these needs with their tailored UVLO levels.
Key Features and Benefits
The new PWM controller ICs boast impressive specifications, featuring an input voltage range of 6.9V to 28.0V, circuit current capability up to 2.0mA, and a maximum startup current of 75µA. Additionally, they support a maximum duty cycle of 50% and come in a standard SOP-J8 package, which is comparable to the JEDEC SOIC8. This compatibility with standard products commonly found in power supply circuits simplifies the redesign process, thereby reducing the effort required for modifications. Furthermore, these variants include a self-recovery type UVLO function equipped with voltage hysteresis, enhancing application reliability by minimizing threshold voltage errors to ±5%, considerably better than the conventional ±10% offered by standard products.
Long-term Availability and Future Plans
ROHM is committed to ensuring a long-term supply of these ICs, providing users with the confidence needed for continuous operation of long-life industrial equipment. The company also has plans to expand its product lineup to include variants suitable for driving high-voltage MOSFETs and GaN devices. Additionally, there are intentions to introduce more variants that can support a maximum duty cycle of 100%.
Product Lineup Overview
Some of the new products include:
- BD28C55FJ-LB for low-voltage MOSFETs
- BD28C54FJ-LB for medium- to high-voltage MOSFETs
- BD28C57LFJ-LB for IGBTs
- BD28C57HFJ-LB for SiC MOSFETs
Applications of the New PWM Controllers
The newly introduced PWM controller ICs find suitable applications across various industrial sectors, including:
- Power supply circuits for AC-DC conversions
- Motor drive inverters
- Various other AC-powered industrial devices
Availability and Distribution
The new PWM controller ICs are available for purchase now and can be found through notable online distributors like DigiKey™ and Mouser™. As additional partners join the distribution network, further options will be made available. Customers can look for part numbers such as BD28C54FJ-LB, BD28C55FJ-LB, BD28C57LFJ-LB, and more in the market.
DigiKey™ and Mouser™ are respected names in electronic components distribution, ensuring customers have reliable access to these innovative products.
Frequently Asked Questions
What are the key features of the new PWM controller ICs from ROHM?
The new PWM controllers feature an input voltage range of 6.9V to 28.0V, circuit current up to 2.0mA, and support a maximum duty cycle of 50%.
How do these ICs improve industrial applications?
These ICs are designed to enhance power supply reliability and efficiency while meeting stringent industrial performance demands.
What applications can benefit from the new PWM controllers?
The controllers can be utilized in AC-DC power supplies, motor drive inverters, and other AC-powered devices.
Where can I purchase ROHM's new PWM controller ICs?
The new ICs are available through online distributors, including DigiKey™ and Mouser™.
Will ROHM expand its product line for these controllers?
Yes, ROHM plans to expand its product offerings to include variants for high-voltage MOSFETs and GaN devices in the future.
