ROHM BD9E200FP4-Z 2.0A Integrated MOSFET Single Synchronous Buck DC Converter User Guide

: June 13, 2024
: ROHM

Table of Contents

General Cautions
Simulation Schematic
How to simulate
Simulation Conditions
- Parameter/Variables
BD9E200FP4 model
Link to the product information and tools
References
Read User Manual Online (PDF format)
Download This Manual (PDF format)

ROHM BD9E200FP4-Z 2.0A Integrated MOSFET Single Synchronous Buck DC Converter User Guide

This circuit simulates the load response of BD9E200FP4-Z. You can observe the fluctuation of the output voltage when the load current is abruptly changed. You can customize the simulation conditions by changing the parameters of components highlighted in blue, such as VIN, IOUT, or peripheral components, and simulate the load response with desired operating condition.

General Cautions

Caution 1: The values from the simulation results are not guaranteed. Use these results as a guide for your design.
Caution 2: These model characteristics are specifically at Ta = 25 °C. Thus, the simulation result with temperature variances may significantly differ from the result with the one done at actual application board (actual measurement).
Caution 3: Please refer to the datasheet for details of the technical information.
Caution 4: The characteristics may change depending on the actual board design and ROHM strongly recommend to double check those characteristics with actual board where the chips will be mounted on.

Simulation Schematic

Figure 1. Simulation Schematic

How to simulate

The simulation settings, such as time domain or convergence options, are configurable from the ‘Simulation Settings’ shown in Figure 2, and Table 1 shows the default setup of the simulation.

In case of simulation convergence issue, you can change advanced options to solve. The temperature is set to 25 °C in the default statement in ‘Manual Options’.

Figure 2. Simulation Settings and execution

Table 1. Simulation settings default setup

Parameters	Default	Note
Simulation Type	Time-Domain	Do not change Simulation Type
End Time	12 ms	–
Advanced options	Balanced	–
Time Resolution EnhancementConvergence Assist	–
Manual Options	.temp 25	–

Simulation Conditions

Parameter/Variables

No variables were used in the design. Table 2 shows the settings of the supplies used.

Table 2. List of the simulation condition parameters

Instance Name	Type	Parameters	Default Value	Units
VIN	Voltage Source	Initial_value	0	V
Pulse_value	12	V
ramptime_initial_to_pulse	1	µs
ramptime_pulse_to_initial	1	µs
Start_delay	0.1	ms
Pulse_width	10	s
Period	11	s
VEN	Voltage Source	Initial_value	0	V
Pulse_value	3	V
ramptime_initial_to_pulse	1	µs
ramptime_pulse_to_initial	1	µs
Start_delay	0.1	ms
Pulse_width	10	s
Period	11	s
iload	Current Source	Initial_value	0.5	A
Pulse_value	1.5	A
ramptime_initial_to_pulse	40	µs
ramptime_pulse_to_initial	40	µs
Start_delay	10	ms
Pulse_width	1.1	ms
Period	10	s

(Note 1) Set it to the guaranteed operating range of the DCDC Converter.

BD9E200FP4 model

The simulation model in this circuit is designed for load response, and the functions not related to load response are not implemented.

Table 3. BD9E200FP4 model pins used for load response

Pin Name	Description
VIN	Power supply input.
EN	Enable input.
BOOT	Pin for bootstrap.
SW	Switching node.
FB	Output voltage feedback pin.
GND	Ground.

Peripheral Components
To set parameters of components, open ‘property’ by double click or right click on a component. You can input a value to a property text box if available. Please refer to the hands-on manual for more details.

Bill of Material

Table 4 shows the list of components used in the simulation schematic. Each of the capacitor and inductor has the parameters of equivalent circuit shown below. The default value of equivalent components are set to zero except for the parallel resistance of L and series resistance of capacitors. You can modify the values of each component.

Table 4. List of components used in the simulation circuit

Type	Instance Name	Default Value	Units
Resistor	r1	50m	Ω
r2	100k	Ω
r3	22k	Ω
r4	5m	Ω
r5	5m	Ω
r6	5m	Ω
Capacitor	c1	0.1	µF
c2	56	pF
c3	19.8	µF
c4	19.8	µF
Inductor	L1	10	µH

Capacitor Equivalent Circuits

(a) Property editor

(b) Equivalent circuit

Figure 1. Capacitor property editor and equivalent circuit

The default value of ESR is 0 mΩ.

Inductor Equivalent Circuits

(a) Property editor

(b) Equivalent circuit

Figure 2. Inductor property editor and equivalent circuit

The default value of PAR_RES is 6.6 kΩ.

(Note 1) These parameters can take any positive value or zero in simulation but it does not guarantee the operation of the IC in any condition. Refer to the datasheet to determine adequate value of parameters.

Link to the product information and tools

DC/DC Converter
BD9E200FP4-Z : Integrated MOSFET Single Synchronous Buck DC/DC Converter. [JP] [EN] [CN] [KR] [TW] [DE]
General Purpose Chip Resistors
MCR01MZPF : Thick Film Chip Resistors. [JP] [EN] [CN] [KR] [TW] [DE]

Technical Articles and Tools can be found in the Design Resources on the product web page.

Notes

The information contained herein is subject to change without notice.
Before you use our Products, please contact our sales representative and verify the latest specifications :
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 safety measures such as complying with the derating characteristics, implementing redundant and fire prevention designs, and utilizing backups and fail-safe procedures. ROHM shall have no responsibility for any damages arising out of the use of our Poducts beyond the rating specified by ROHM.
Examples of application circuits, circuit constants and any other information contained herein are provided 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.
The technical information specified herein is intended only to show the typical functions of and examples 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 other parties. ROHM shall have no responsibility whatsoever for any dispute arising out of the use of such technical information.
The Products specified in this document are not designed to be radiation tolerant.
For use of our Products in applications requiring a high degree of reliability (as exemplified below), 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.
Do not use our Products in applications requiring extremely high reliability, such as aerospace equipment, nuclear power control systems, and submarine repeaters.
ROHM shall have no responsibility for any damages or injury arising from non-compliance with the recommended usage conditions and specifications contained herein.
ROHM has used reasonable care to ensure the accuracy of the information contained in this document. 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 such information.
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 a ROHM sales office. ROHM shall have no responsibility for any damages or losses resulting non-compliance with any applicable laws or regulations.
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