ROHM RLD90QZWx Series 905 nm Pulsed Laser Diode User Guide

ROHM RLD90QZWx Series 905 nm Pulsed Laser Diode

RLD90QZWx series / Resonant wave B-01

This circuit simulate the resonant wave B-01 Time-Domain response of RLD90QZWx series. You can observe the resonant wave of not only the current but also the optical output waveform. You can customize the parameters of the components shown in blue, such as VIN, or peripheral components, and simulate the resonant wave B-01 Time-Domain with desired operating condition.

General Cautions

• Caution 1: The values from the simulation results are not guaranteed. Please use these results as a guide for your design.
• Caution 2: Please refer to the Application note of Laser Diode for details of the technical information.
• Caution 3: 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

**

How to simulate

The simulation settings, such as simulation time 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. Default statement in ‘Manual Options’ is a sets the transient analysis and parameter. You can modify it. Table 1. Simulation settings default setup

Advanced options

| Balanced| –
Time Resolution Enhancement

Convergence Assist

|

–

Manual Options| “.tran 0 10ns 0ns

.param VIN 90”

| Default VIN for RLD90QZW3 is 60 V. RLD90QZW5 and RLD90QZW6 (30 V). RLD90QZW8 (90 V).

Simulation Conditions

Table 2. List of the simulation condition parameters

V1

|

Voltage Source

| Voltage_level| VIN| 1| 190| V
AC_magnitude| 0.0| fixed| V
AC_phase| 0.0| fixed| ns

V2

|

Voltage Source

| Initial_value| 0| -5| 3| V
Pulse_value| 5| 4| 6| V
ramptime_initial_to_pulse| 1n| 1n| 1µ| s
ramptime_pulse_to_initial| 1n| 1n| 1µ| s
Start_delay| 0| 0| 100| s
Pulse_width| 30n| 1n| 1| s
Period| 100µ| 10n| 1| s

V2 parameter setup

Figure 3 shows how the V2 parameters correspond to the VIN stimulus waveform.

RLD90QZW8_Po model

Table 3 shows the model pin function implemented. Note that RLD90QZWx series_Po is the behavior model for its optical output power response operation, and no protection circuits or the functions not related to the purpose are not implemented.

Table 3. RLD90QZWx series_Po model pins used for the simulation

Optical Output Power

RLD90QZWx series_Po model outputs optical output power in V [volts] unit. Optical Output Power insert model multiplies the output result by 1A and convert it to W [watts]. To monitor the optical output power in W [watts], select probe item ‘power_output’ from property of Optical Output Power insert model.

Peripheral Components

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 ESR of C, and parallel resistance of L. You can modify the values of each component.

Table 4. List of capacitors, inductors, and resistors used in the simulation circuit

Inductor

| L1| 0.5| 0.1| 100| nH
L2| 3| 0.1| 100| nH
L3| 2| 0.1| 100| nH
Resistor| R1| 1k| 0.1| 10k| Ω
R2| 1.5| 0.01| 100| Ω

Capacitor Equivalent Circuits

The default value of ESR is 0.01 Ω.

Inductor Equivalent Circuits

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

Laser Diode

• RLD90QZW3 : 905 nm, 75 W, 225 μm Invisible Pulsed Laser Diode. [JP] [EN] [CN] [KR] [TW] [DE]
• RLD90QZW5 : 905 nm, 25 W, 70 μm Invisible Pulsed Laser Diode. [JP] [EN] [CN] [KR] [TW] [DE]
• RLD90QZW6 : 905 nm, 25 W, 50 μm Invisible Pulsed Laser Diode. [JP] [EN] [CN] [KR] [TW] [DE]
• RLD90QZW8 : 905 nm, 120 W, 270 μm Invisible Pulsed Laser Diode. [JP] [EN] [CN] [KR] [TW] [DE]

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

Notes

1. The information contained herein is subject to change without notice.
   Before you use our Products, please contact our sales representative and verify the latest specifica-tions :

2. Although ROHM is continuously working to improve product reliability and quality, semicon-ductors can break down and malfunction due to various factors.

3. 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.

4. 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.

5. 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.

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 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.

8. Do not use our Products in applications requiring extremely high reliability, such as aerospace equipment, nuclear power control systems, and submarine repeaters.

9. ROHM shall have no responsibility for any damages or injury arising from non-compliance with the recommended usage conditions and specifications contained herein.

10. 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.

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 a ROHM 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 and regulations, 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 of ROHM.

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