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Category: LEDs & Optoelectronics

Find all the optoelectronic devices your electronic system needs from our optoelectronics LEDs & displays range. Optoelectronic components are needed to convert electrical signals into light signals. LEDs, discrete LEDs, display modules, illumination, lamps, lasers, LED displays, and other components are available from Volt.Tech. Our main focus has always been in the area of application solutions to optimize your products performance. Our team of design engineers and R&D scientist are committed to providing you with unsurpassed technical support. Please post any questions relating to LEDs, LCDs, IR, Laser, OLED or any other optoelectronics devices in this section.

volt.tech Latest Questions

marrysmith08
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marrysmith08
Asked: February 9, 2024In:
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Hi there to all of you. There are two micro USB ports on the ESP32 S3 Dev kit. One is identified as “UART,” and the other as “USB.” The “UART” port allows me to flash fresh firmware smoothly, however the “USB” ...Read more

Hi there to all of you.

There are two micro USB ports on the ESP32 S3 Dev kit. One is identified as “UART,” and the other as “USB.”
The “UART” port allows me to flash fresh firmware smoothly, however the “USB” connector does not. Since my ESP32 S3 is enclosed in a quadrangle, I am unable to access the RESET or charge buttons.

Is it feasible to use the “USB” port to flash a fresh firmware onto the ESP32 S3 Development kit?

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firmwareusb
nidhi singh
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nidhi singh
Asked: September 15, 2023In:
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Hello, Not sure that the product I am looking for exists. It should behave like an LED driver but after looking through different LEDs I did not find a product that meets my needs.Can drive 1…. 15 LEDs connected in series Have ...Read more

Hello,

Not sure that the product I am looking for exists. It should behave like an LED driver but after looking through different LEDs I did not find a product that meets my needs.

  • Can drive 1…. 15 LEDs connected in series
  • Have a possibility to change current through LEDs (not by PWM!)
  • Have the possibility to switch ON/ OFF LEDs rapidly. to ensure bitrate 200kb/ sec

Does such a product exist?

Thanks.

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driverledpwmseries
  1. [Deleted User]

    Hello, Right, existing LED drivers all have PWM engines. It depends on the LED, some have Vf = 1.8, and some have 3.5V. So, 15x3.5 = 52.5 V in direct mode. Also current, 20 mA or more? For low current low voltage OPA may be an option, or OPA buffered by transistor for high CV. Thank You

    Hello,

    Right, existing LED drivers all have PWM engines.

    It depends on the LED, some have Vf = 1.8, and some have 3.5V. So, 15×3.5 = 52.5 V in direct mode. Also current, 20 mA or more?

    For low current low voltage OPA may be an option, or OPA buffered by transistor for high CV.

    Thank You

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sachinsharma
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sachinsharma
Asked: September 1, 2023In:
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Hello, I learned that XDPL8221 can achieve 120- 277V input, 0- 10V dimming, and CC or CV output. These functions are what I need. I also want it to support TRIAC dimmer, can it support TRIAC dimming? Or is there any other recommended ...Read more

Hello,

I learned that XDPL8221 can achieve 120- 277V input, 0- 10V dimming, and CC or CV output. These functions are what I need.

I also want it to support TRIAC dimmer, can it support TRIAC dimming?

Or is there any other recommended IC that can achieve such a function?

Thank You

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dimmersICledtriacxdpl8221
  1. [Deleted User]

    Hi @sachinsharma, XDPL8221 has a PWM dimming interface which is implemented with the aid of CDM10V. The duty cycle sensed at the PWM pin will set the output current accordingly. Please have a look at the LED/SMPS Flyback Control IC IRS2982S which may fulfill your requirement. This driver is TRIAC diRead more

    Hi sachinsharma,

    XDPL8221 has a PWM dimming interface which is implemented with the aid of CDM10V. The duty cycle sensed at the PWM pin will set the output current accordingly.

    Please have a look at the LED/SMPS Flyback Control IC IRS2982S which may fulfill your requirement. This driver is TRIAC dimmable. Refer to the attached application note for more details.

    Regards,
    Alex Thomas

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nidhi singh
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nidhi singh
Asked: December 1, 2022In:
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Hello, What is the difference between Parts L9826 and Parts E-L9826？ I can not see the difference between them from the datasheets. Thank you in Advance

Hello,

What is the difference between Parts L9826 and Parts E-L9826？ I can not see the difference between them from the datasheets.

Thank you in Advance

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datasheetse-l9826l9826ledsopteolectronicspower management
  1. ashishgawade

    There's no technical difference between L9826 and E-L9826. At the time, the version with the prefix E- indicated the more environmentally friendly Eco version, which has been standard for a long time. still, please mark this thread as answered by selecting Select as best, as also explained then, IfRead more

    There’s no technical difference between L9826 and E-L9826. At the time, the version with the prefix E- indicated the more environmentally friendly Eco version, which has been standard for a long time.

    still, please mark this thread as answered by selecting Select as best, as also explained then, If the problem is solved. This will help other users find that answer faster.
    Regards

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ashishgawade
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ashishgawade
Asked: September 19, 2022In:
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We’re using the L6920 to drive a 1-watt LED. We’re trying to apply the under voltage cut-off ( lockout) too. We chose the values of the voltage ground connected to the LBI pin similar that the value that comes to say ...Read more

We’re using the L6920 to drive a 1-watt LED.

We’re trying to apply the under voltage cut-off ( lockout) too. We chose the values of the voltage ground connected to the LBI pin similar that the value that comes to say 3V. Still, the IC didn’t shut off at 3V.
We also tried connecting the LBO to Vout with a 200K resistor in between. Even this didn’t work.

Can someone help apply this circuit?
Thanks!

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circuitdriveICl6920ledsoptoelectronics
  1. Best Answer
    [Deleted User]

    Hi Ashish, However, you would notice that LBI input is connected to LBO output and that's the only purpose of this input, If you look into the block diagram of L6920 in its datasheet. LBI input doesn't shut down the output! Still, you need to use LBO output to shut down accordingly, If you require tRead more

    Hi Ashish,

    However, you would notice that LBI input is connected to LBO output and that’s the only purpose of this input, If you look into the block diagram of L6920 in its datasheet. LBI input doesn’t shut down the output!
    Still, you need to use LBO output to shut down accordingly, If you require to shut down the output.

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nidhi singh
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nidhi singh
Asked: September 7, 2022In:
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Hello I’m developing an operation that does led control with a button, I use a counter for this, but every time I hold the button, the counter increases further than 1 So indeed if I hold the button down, I want ...Read more

Hello

I’m developing an operation that does led control with a button, I use a counter for this, but every time I hold the button, the counter increases further than 1 So indeed if I hold the button down, I want it to increase once.

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buttoncontroldevelopingledsoptoelectronics
  1. [Deleted User]

    Perhaps you should debounce the button, as mechanical buttons bounce, i.e. may produce more than one pulse per button press. There are several techniques to do that, one of the easiest is to connect some small capacitor in parallel to the button, which together with the pull resistor forms some lowRead more

    Perhaps you should debounce the button, as mechanical buttons bounce, i.e. may produce more than one pulse per button press.

    There are several techniques to do that, one of the easiest is to connect some small capacitor in parallel to the button, which together with the pull resistor forms some low pass filter. The time constant of that filter should be slightly lower than the period of the maximum speed to press that button(e.g.100.200 ms). You’ll find this solution also at the NUCLEO or DISCOVERY boards.

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Sandeep kumar
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Sandeep kumar
Asked: August 2, 2022In:
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Hello, I’m working on an application that uses a button to control LEDs. Every time I hold the button, the counter goes up by more than 1.

Hello, I’m working on an application that uses a button to control LEDs. Every time I hold the button, the counter goes up by more than 1.

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  1. [Deleted User]

    Perhaps you should debounce the button since mechanical buttons can produce many pulses when pressed. One of the simplest methods is to connect a tiny capacitor in parallel to the button, which, along with the pull resistor, creates a low pass filter. To press that button, the time constant of thatRead more

    Perhaps you should debounce the button since mechanical buttons can produce many pulses when pressed.

    One of the simplest methods is to connect a tiny capacitor in parallel to the button, which, along with the pull resistor, creates a low pass filter. To press that button, the time constant of that filter needs to be a little bit less than the duration of the maximum speed (e.g. 100..200ms).

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Anonymous
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Anonymous
Asked: May 17, 2022In:
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In dp xpdl version 2 interface software some error problem of CSV file don’t open the  design parameter (the error showing is image configuration file )? Please solve the problem and send me the configuration setting.

In dp xpdl version 2 interface software some error problem of CSV file don’t open the  design parameter (the error showing is image configuration file )?

Please solve the problem and send me the configuration setting.

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CSVdp xdpl version 2interface
  1. Mahendra Metil

    Hello, To create or debug the CSV file, we need to configure dot DP vision with an updated version & related XDPL series. We need to download images & Waveform data of the XDPL part & copy them into a folder of images.

    Hello,

    To create or debug the CSV file, we need to configure dot DP vision with an updated version & related XDPL series.

    We need to download images & Waveform data of the XDPL part & copy them into a folder of images.

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kumarrakesh
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kumarrakesh
Asked: May 11, 2022In:
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We are using LED chip 5050 in our 100 Watt Flood light and there we found in some LED chip is glowing half. So, Please advise about the problem happened here.

We are using LED chip 5050 in our 100 Watt Flood light and there we found in some LED chip is glowing half. So, Please advise about the problem happened here.

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LED ChipLED Chip 5050
  1. [Deleted User]

    Hi ,   Please check the junction temperature , may be if temperature goes high then same issue can be happen .   Thanks Zazho

    Hi ,

     

    Please check the junction temperature , may be if temperature goes high then same issue can be happen .

     

    Thanks

    Zazho

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nidhi singh
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nidhi singh
Asked: April 20, 2022In:
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I have Renesas RH850F1K (R7F701649) microcontroller and using CS+ IDE. How to set the LED1,if it is connected to P0_11? I want to toggle this LED1.

I have Renesas RH850F1K (R7F701649) microcontroller and using CS+ IDE. How to set the LED1,if it is connected to P0_11? I want to toggle this LED1.

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gpio pinsledRenesas MicrocontrollerRenesas RH850F1KRH850F1K(R7F701649)
  1. [Deleted User]

    The hardware User Manual contains the information required to access I/O and peripherals among other things. RH850/F1KM, RH850/F1KH User's Manual: Hardware (R01UH0684EJ0110) Sample code is available to demonstrate many of the concepts.  

    The hardware User Manual contains the information required to access I/O and peripherals among other things. RH850/F1KM, RH850/F1KH User’s Manual: Hardware (R01UH0684EJ0110) Sample code is available to demonstrate many of the concepts.

     

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