Power controller IC performs tight regulation of auxiliary power supplies

The BD28C5xH/LFJ-LB family of power controllers from ROHM is supplied in various versions to meet the different protection threshold requirements of silicon MOSFETs, IGBTs and silicon carbide MOSFETs.

ROHM has released a new family of PWM controller ICs for auxiliary dc-dc power supplies in 

industrial applications.  

 

The BD28C5xH/LFJ-LB controllers have tight, accurate electrical characteristics which enable power-system designers to reduce component count and bill-of-materials cost while improving system performance.  

 

The variants in the BD28C5xH/LFJ-LB family offer different under-voltage lockout thresholds, making them suitable for different types of power switch and providing valuable design flexibility.  

 

The power controllers are pin-compatible with competing controllers available on the market today. The controllers are supplied in an SOP-J8 package measuring 4.9 mm x 6.0 mm x 1.65 mm.  

 

Part Number 

Under-voltage Lockout Threshold 

Target Power Device Type 

BD28C55FJ-LB  

8.4 V/7.6 V 

Silicon MOSFET 

BD28C54FJ-LB  

14.5 V/9.0 V 

Silicon MOSFET or IGBT 

BD28C57LFJ-LB 

18.8 V/14.5 V 

Silicon carbide MOSFET 

BD28C57HFJ-LB 

18.8 V/15.5 V 

Silicon carbide MOSFET 

Features

  • Input-voltage range: 6.9 V to 28.0 V 
  • 2 mA maximum operating current  
  • 60 µA start-up current 
  • Adjustable switching frequency 
  • Cycle-by-cycle over-current protection 

Applications

  • Industrial motor drives 
  • EV charging stations 
  • Solar power systems 
  • Power supplies 
  • Uninterruptible power supplies 
ROHM — BD28C5xH_LFJ-LB Power Controller

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