# Easily Design External Circuit Constants for ICs (DC/DC, AC/DC) with ROHM’s Design Calculation Tool

January 7th, 2022

As ICs become more multifunctional and complex, so too does the design of peripheral circuits. ROHM has released a calculation tool that supports the configuration of peripheral circuits for both DC/DC and AC/DC converter ICs. This helps reduce the design load for the initial stage of component selection along with external constant design.

AC/DC Converters:
Use this to calculate coils, transformers, and other peripheral components for flyback and buck converters.
ICs together with primary components such as Schottky barrier diodes, fast recovery diodes, field capacitors, transformers, and other peripheral parts are contained in a database that allows for sorting and fast selection.

DC/DC Converters:
Automatically calculates the theoretical equations for peripheral circuit design listed in the datasheet (in Excel format), determines if the design is out of scope, and even creates a BOM list. Entering the constants obtained here in our free online simulation tool (ROHM Solution Simulator) makes it possible to verify the operating waveforms. SPICE models are also available for users with simulation tools.

### Design Calculation Tool (Calculation Sheet) List of Supported Products

Product
Category
GradeProduct InformationDesign Calculation ToolRegistered in ROHM Solution Simulator CircuitSimulation Models
AutomotiveIndustryPart NumberfeaturePSPICE ModelNon-Encrypted SPICE Model
AC/DC IC  AC/DC ICNon-Isolated PWM Buck Converter Circuit---
AC/DC ICQR Control Flyback Converter Circuit---
DC/DC IC  BD9G341AEFJ12 to 76V 3.5A Current Mode
BD9G341AEFJ-LB12 to 76V 3.5A Current Mode
BD9G500EFJ-LA7 to 76V 5A Current Mode
BD9G101G6.0 to 42V 0.5A Current Mode fsw=1.5MHz---
BD9G201EFJ-M4.5 to 42V 1.5A Current Mode--
BD9G201EFJ-LB4.5 to 42V 1.5A Current Mode--
BD9G401EFJ-M4.5 to 42V 3.5A Current Mode--
BD9A101MUV-LB2.7 to 5.5V 1A Current Mode-
BD9A201FP4-LBZ2.7 to 5.5V 2A Current Mode--
BD9A301MUV-LB2.7 to 5.5V 3A Current Mode-
BD9B100MUV2.7 to 5.5V 1A COT fsw=2MHz---
BD9B200MUV2.7 to 5.5V 2A COT fsw=2MHz---
BD9B300MUV2.7 to 5.5V 3A COT fsw=2MHz---
BD9B301MUV-LB2.7 to 5.5V 3A COT-
BD9B305QUZ2.7 to 5.5V 3A COT small package---
BD9B333GWZ2.7 to 5.5V 3A COT CSP package---
BD9B400MUV2.7 to 5.5V 4A COT fsw=2MHz---
BD9B500MUV2.7 to 5.5V 5A COT fsw=2MHz---
BD9B600MUV2.7 to 5.5V 6A COT---
BD9E100FJ-LB7 to 36V 1A Current Mode fsw=1MHz-
BD9E101FJ-LB7 to 36V 1A Current Mode fsw=0.57MHz-
BD9E104FJ7 to 26V 1A Current Mode SLLM™
BD9E105FP4-Z4.5 to 28V 1A Current Mode---
BD9E300EFJ-LB7 to 36V 2.5A Current Mode fsw=1MHz
BD9E301EFJ-LB7 to 36V 2.5A Current Mode fsw=0.57MHz-
BD9E302EFJ7 to 28V 3A Current Mode SLLM™-
BD9E303EFJ-LB7 to 36V 3A Current Mode
BD9E304FP4-LBZ4.5 to 36V 3A Current Mode---
BD9F500QUZ4.5 to 36V 5A Nano Pulse Control™---
BD9F800MUX-Z4.5 to 28V 8A COT---
BD9P105EFV-C3.5 to 40V 1A Nano Pulse Control™-
BD9P105MUF-C3.5 to 40V 1A Nano Pulse Control™-
BD9P135EFV-C3.5 to 40V 1A 3.3V output Nano Pulse Control™-
BD9P135MUF-C3.5 to 40V 1A 3.3V output Nano Pulse Control™-
BD9P155EFV-C3.5 to 40V 1A 5.0V output Nano Pulse Control™-
BD9P155MUF-C3.5 to 40V 1A 5.0V output Nano Pulse Control™-
BD9P205EFV-C3.5 to 40V 2A Nano Pulse Control™-
BD9P205MUF-C3.5 to 40V 2A Nano Pulse Control™-
BD9P235EFV-C3.5 to 40V 2A 3.3V output Nano Pulse Control™-
BD9P235MUF-C3.5 to 40V 2A 3.3V output Nano Pulse Control™-
BD9P255EFV-C3.5 to 40V 2A 5.0V output Nano Pulse Control™-
BD9P255MUF-C3.5 to 40V 2A 5.0V output Nano Pulse Control™-
BD9C301FJ4.5 to 18V 3A Current Mode-
BD9C301FJ-LB(H2)4.5 to 18V 3A Current Mode-
BD9C401EFJ4.5 to 18V 4A Current Mode---
BD9C501EFJ4.5 to 18V 5A Current Mode---
BD9C601EFJ4.5 to 18V 6A Current Mode---

Can also be downloaded from the product page/model and tool/calculation tool of applicable products.
Click here for a list of supported models for the Design Calculation Tool.

*Compatible products will continue to be added