C-008. DC-DC Buck Synchro Converter Vo=250V,
Io=100A
ROHM Solution Simulator Schematic Information
Simulation Parameters2023. Feb
64UG125E Rev.004

Simulation Circuit

Component
nameComponent

Default

Simulation
Setting Range

Vin1

Input voltage

800VdcVo

Output voltage

250VdcIo

Output current

100Adcfsw1

Switching frequency

50kHz

Tj

Temperature

100°C

Vd1,2+

Gate Drive voltage H

18V

10 – 20V

Vd1,2-

Gate Drive voltage L-4V

-4 – 0V

Vdin

Signal voltage level

5V

Component
Name

Component

Default

Q1

SiC Power Module

Selectable

GD-IC1,2Gate Driver

BM61S41RFV-C

R sink1,2

Resistor for sink

ESR18 1Ω

0.1 -R source1,2

Resistor for source

ESR18 2Ω

0.1 -L1

Inductor

200µH

10µH - 2mH

C1

Capacitor

10µF

1µF - 1mF

Ro

Output Resistor{Vo/Io}Q1
10k – 300kHz

ILIin

Io

L1

Vin1

C1

VoRoDevices© 2022 ROHM Co., Ltd.

Simulation
Setting Range

R sink1

GD-IC1

fsw1

Vd1-

R source1

Vd1+

GD-IC2

R sink2
R source2

Vdin
Vd2-

Vd2+

Note: The Loss_calc component is a utility module to support power loss calculation and does not affect the simulation
P. 1
results of circuit operation or performance.

C-008. DC-DC Buck Synchro Converter Vo=250V,
Io=100A
ROHM Solution Simulator Schematic Information
2023. Feb
64UG125E Rev.004

Selectable Devices
Component
nameComponent

Product No.

featureQ1

SiC Power Module

BSM080D12P2C008

800V, 120A

BSM120D12P2C005 (*)

1200V, 120A

* Default device© 2022 ROHM Co., Ltd.

Note) We have not been able to confirm operation with all combinations. Please read the disclaimer carefully.

P. 2

Simulation Waveform
ROHM Solution Simulator Schematic Information
Io, Iin, IL (0～2.00ms)

Vin=800V Vo=250V
Io=100A Tj=100℃

Io, Iin(A)Expansion （1.00ms～1.06ms）

2023. Feb
64UG125E Rev.004

Io, Iin(A)Orange : Io(A)Orange : Io(A)(1.00～1.06ms)

Red : Iin(A)

IL(A)

IL(A)

Blue : IL1(A)© 2022 ROHM Co., Ltd.

Red : Iin(A)Blue : IL1(A)P. 3

Efficiency, Power Dissipation 1
ROHM Solution Simulator Schematic Information

100100Efficiency (%)

98969490969490
300

500

400500600700800900500

Power Dissipation

Pd(W)

400

Q1300
200
1000300

0Power Dissipation (W)Power Dissipation (W)Efficiency : 100×Po/Pin

9292© 2022 ROHM Co., Ltd.

2023. Feb
64UG125E Rev.004

Efficiency (%)

98

Efficiency : 100×Po/Pin
Efficiency ( %)Efficiency ( %)Po : 10kW～25kW

Vo=250V Io=100A
Tj=100℃

Vin : 400V～800V

Vin=800V Vo=250V
Tj=100℃

10Pd(W)

2030

Power Dissipation

400300

Q1200
100

0400

500

600
Vin (V)

700

800

900

0102030

Po (kW)P. 4

Efficiency, Power Dissipation 2
ROHM Solution Simulator Schematic Information
Tj : -25℃～125℃
100

Efficiency (%)

98

Efficiency ( %)Vin=800V Vo=250V
Io=100A

2023. Feb
64UG125E Rev.004

Efficiency : 100×Po/Pin

96949290-40

Power Dissipation (W)500-20020406080100120140100120140

Power Dissipation

Pd(W)

400

Q1300
200
1000-40-20020406080

Tj (℃)© 2022 ROHM Co., Ltd.

P. 5

How to change the devices

ROHM Solution Simulator Schematic Information
2023. Feb
64UG125E Rev.004

Right-click on the device© 2022 ROHM Co., Ltd.

Select Properties

Pull down “SpiceLib Part”

Select the productP. 6

Loss Calculation Model

ROHM Solution Simulator Schematic Information

Loss Calculation Model outputs the instantaneous value of power loss and its integration.

Loss calculation model ‘Loss_calc’

2023. Feb
64UG125E Rev.004

Waveform example

Vds of MOSFET

Id of MOSFET

Vgs of MOSFET

𝑙𝑜𝑠𝑠_𝑜𝑢𝑡 𝑡 = 𝐼 𝑡 × 𝑉 𝑡𝑡loss_out

𝑙𝑜𝑠𝑠_𝑖𝑛𝑡𝑒𝑔_𝑜𝑢𝑡 = න 𝑙𝑜𝑠𝑠_𝑜𝑢𝑡 𝑡 𝑑𝑡
0

loss_integ_out

I : Current through p1 to p1s
V : Voltage between p1s and p2© 2022 ROHM Co., Ltd.

P. 7

NoticeNotes
1) The information contained herein is subject to change without notice.
2) Before you use our Products, please contact our sales representative and verify the latest specifications :3) Although ROHM is continuously working to improve product reliability and quality, semiconductors can break down and malfunction due to various factors.
Therefore, in order to prevent personal injury or fire arising from failure, please take safetymeasures such as complying with the derating characteristics, implementing redundant andfire prevention designs, and utilizing backups and fail-safe procedures. ROHM shall have noresponsibility for any damages arising out of the use of our Poducts beyond the rating specified byROHM.
4) Examples of application circuits, circuit constants and any other information contained herein areprovided only to illustrate the standard usage and operations of the Products. The peripheral
conditions must be taken into account when designing circuits for mass production.
5) The technical information specified herein is intended only to show the typical functions of andexamples of application circuits for the Products. ROHM does not grant you, explicitly or implicitly,
any license to use or exercise intellectual property or other rights held by ROHM or any otherparties. ROHM shall have no responsibility whatsoever for any dispute arising out of the use ofsuch technical information.
6) The Products specified in this document are not designed to be radiation tolerant.
7) For use of our Products in applications requiring a high degree of reliability (as exemplifiedbelow), please contact and consult with a ROHM representative : transportation equipment (i.e.
cars, ships, trains), primary communication equipment, traffic lights, fire/crime prevention, safety
equipment, medical systems, servers, solar cells, and power transmission systems.
8) Do not use our Products in applications requiring extremely high reliability, such as aerospaceequipment, nuclear power control systems, and submarine repeaters.
9) ROHM shall have no responsibility for any damages or injury arising from non-compliance withthe recommended usage conditions and specifications contained herein.
10) ROHM has used reasonable care to ensure the accuracy of the information contained in thisdocument. However, ROHM does not warrants that such information is error-free, and ROHM
shall have no responsibility for any damages arising from any inaccuracy or misprint of suchinformation.
11) Please use the Products in accordance with any applicable environmental laws and regulations,such as the RoHS Directive. For more details, including RoHS compatibility, please contact aROHM sales office. ROHM shall have no responsibility for any damages or losses resulting
non-compliance with any applicable laws or regulations.
12) When providing our Products and technologies contained in this document to other countries,
you must abide by the procedures and provisions stipulated in all applicable export laws andregulations, including without limitation the US Export Administration Regulations and the Foreign
Exchange and Foreign Trade Act.
13) This document, in part or in whole, may not be reprinted or reproduced without prior consent ofROHM.

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