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LED(Light Emitting Diode) is a simple diode that emits light when current goes through it

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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. Alex thomas

    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. Alex thomas

    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: August 28, 2023In:
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Hi, I need help with the PDO2 output in STUSB4500. In spite of setting the PDO Number as 3 and configuring the PDO2 voltage and current values using the STSW- STUSB002 GUI, I can not get any voltage output at PDO2. ...Read more

Hi,

I need help with the PDO2 output in STUSB4500. In spite of setting the PDO Number as 3 and configuring the PDO2 voltage and current values using the STSW- STUSB002 GUI, I can not get any voltage output at PDO2. The status LED is also not glowing. But PDO1 and PDO3 are working OK.

However, I get the PDO2 voltage output, If I change the PDO Number to 2 with the same voltage and current configurations as over. The status LED also glows. So, this isn’t the problem of Source Matching. I’m unable to find out the reason why this is passing and how can I make all the 3 PDOs work easily.

Is there anything that I’m missing in making all the 3 PDOs work together?

Thank You

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ledpdo1pdo2pdo3pdosstusb002stusb4500voltage
  1. ashishgawade

    Hello I assume that you're using our STEVAL_ISC005V1 board and what you call 'PDO1' is Vsnk from the schematic. However, Vsnk lights are on for all PDOs selections. Whereas PDO2 is ON if PDO2 is selected and PDO3 if PDO3 is selected. Our algorithm always tries to select the highest voltage. If the cRead more

    Hello

    I assume that you’re using our STEVAL_ISC005V1 board and what you call ‘PDO1’ is Vsnk from the schematic.

    However, Vsnk lights are on for all PDOs selections. Whereas PDO2 is ON if PDO2 is selected and PDO3 if PDO3 is selected.

    Our algorithm always tries to select the highest voltage. If the charger is so that PDO3 can be selected, then PDO3 Vsink will light on,

    However, also PDO2 Vsnk will light ON. If the charger is smaller.

    Best regards

    Ashish Gawade

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Alex thomas
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Alex thomas
Asked: August 11, 2023In:
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Hello, I added some LED off/on/off/ on code and when I clicked Build, I get the following error message. Build process unable to cancel contents of code gen dir. Error Failed to delete.lcpsoc3 Access to the path.lcpsoc3‘ is denied. I believe that I ...Read more

Hello,

I added some LED off/on/off/ on code and when I clicked Build, I get the following error message.

Build process unable to cancel contents of code gen dir. Error Failed to delete.lcpsoc3 Access to the path.lcpsoc3‘ is denied.

I believe that I can cancel it after a boot from the shutdown, but is there a way to cancel this to allow the build to proceed now rather than later?

Thank You

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errorlcpsoc3ledmessage
  1. ellasmith

    Hello, Check your access rights to the path and the files. Sometimes when files are copied from extern the rights are set to read-only. Thank You Ella

    Hello,

    Check your access rights to the path and the files. Sometimes when files are copied from extern the rights are set to read-only.

    Thank You

    Ella

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sachinsharma
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sachinsharma
Asked: June 10, 2023In:
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Hello, So I just plugged in my Eval kit. I’ve 12V in the barrel jack and am connected to the USB to my pc. When I exchange to the applicable port, I can apply the eval kit GUI to connect and ...Read more

Hello,

So I just plugged in my Eval kit. I’ve 12V in the barrel jack and am connected to the USB to my pc. When I exchange to the applicable port, I can apply the eval kit GUI to connect and ask for the Firmware version. It responds to 1.6 which should be right. But also the coming move is to modify the ID assignment to 1 and look at the D13 LED to light up. This doesn’t be. Indeed more confusingly, I see the D5 led (TX) light up also the D4 led (RX) light up. Shouldn’t it be backward? Eventually, It says the Ack light should turn green when I press configure IDs but it stays red. Am I missing a step? is 12 V 1 amp not enough power for this board?

Thank you

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evalguikitL9963Eledmanagementpowerusb
  1. nidhi singh

    Hello, The X1 connector requires a 12V power force to power the low-voltage side of the board this includes the microcontroller. However, you also want to give power to the high-voltage side of the board (this includes the L9963E) in setup to power and give with the IC. Since you're just giving 12VRead more

    Hello,

    The X1 connector requires a 12V power force to power the low-voltage side of the board this includes the microcontroller. However, you also want to give power to the high-voltage side of the board (this includes the L9963E) in setup to power and give with the IC. Since you’re just giving 12V to the uC, the behavior you’re viewing is normal the uC acknowledges and replies with the FW version. Since the L9963E isn’t powered on, it can not communicate, and so the uC continues to poll staying for an SPI response.

    Please download the user manual available on our website and follow the muumuu configuration laid out in section 2.2, as well as the getting started companion( section 3). This will outline the way demanded to get the board up and streaming correctly. Specifically, supplying power to P2-> at a minimal P2- 15 (VBAT) and P2-9/23 (GND) should be connected to give 12V (or stack voltage) to the L9963E.

    Thank You

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Alex thomas
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Alex thomas
Asked: February 8, 2023In:
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Hi, I have an IC on the side which is written” HVLED01A” on it and I want to know its output number. I wonder is equal to the” HVLED001A” output number or if it’s another IC? Thank you in advance.

Hi, I have an IC on the side which is written” HVLED01A” on it and I want to know its output number.

I wonder is equal to the” HVLED001A” output number or if it’s another IC?

Thank you in advance.

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codehvled01aICledoptoelectronics
  1. vikas Nagpal

    Welcome, to the community! yes, I can confirm the HVLED001A uses the device marking HVLED01A. Good luck! If the problem is resolved, please mark this content as answered by selecting Select as best,  This will help other users find that answer faster. Thank You

    Welcome, to the community!

    yes, I can confirm the HVLED001A uses the device marking HVLED01A.

    Good luck!

    If the problem is resolved, please mark this content as answered by selecting Select as best,  This will help other users find that answer faster.

    Thank You

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vikas Nagpal
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vikas Nagpal
Asked: January 30, 2023In:
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Hello, Can LED2472G be applied as a shift register to drive signal relays with a coil current of <30mA? Can they be applied as general shift registers too? Thanks!

Hello,

Can LED2472G be applied as a shift register to drive signal relays with a coil current of <30mA? Can they be applied as general shift registers too?

Thanks!

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ledled2472goptoelectronicsregistersignal relays
  1. Alex thomas

    Welcome, to the community! Well, LED2472G is a move register, but it can simply be used as similar to a limited extent the individual outputs (bits) are actually constant-current LED drivers, so they aren't actually able for sense purposes. But of course, you can control the loads connected to the iRead more

    Welcome, to the community!

    Well, LED2472G is a move register, but it can simply be used as similar to a limited extent the individual outputs (bits) are actually constant-current LED drivers, so they aren’t actually able for sense purposes. But of course, you can control the loads connected to the individual outputs logically in the same way as a shift register. Only the serial output is directly similar to a classic shift register.

    Still, one could imagine using LED2472G to drive 30mA relays, indeed if this doesn’t correspond to the original purpose. But you mustn’t forget the usual free-wheeling diodes, which due to the unspecified avalanche energy should better be Schottky diodes because only they’re fast enough. Evenultra-fast diodes with a blocking time of 10.20 ns are probably too slow not to damage the respective LED driver- at least nothing guarantees that.

    Does it answer your question?

    Regards

    Alex

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vikas Nagpal
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vikas Nagpal
Asked: January 6, 2023In:
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Hii, I’ve built a sample board of a 2A colorless LED driver applying the LED2000 move-down converter with a single LiIon battery as the power source. Everything seems to be solved as it should, but I would like to try the ...Read more

Hii,

I’ve built a sample board of a 2A colorless LED driver applying the LED2000 move-down converter with a single LiIon battery as the power source.
Everything seems to be solved as it should, but I would like to try the circuit more thoroughly to ensure the design is robust.

Would anyone have pointers on how to test the circuit, what parameters to measure, and what warning signs to look for that may indicate that something isn’t performing optimally?

Thanks, Vikas

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batterycircuitledLED2000liionpower
  1. nidhi singh

    Hi, If you have a DC-coupled Current inquiry you can cover Inductor Current to check if it isn't working in the saturation region. Still, also you can check the switching pin with a voltage inquiry just to see a perfect waveform and measure the right switching frequency. Let me know. Nidhi Singh

    Hi,

    If you have a DC-coupled Current inquiry you can cover Inductor Current to check if it isn’t working in the saturation region. Still, also you can check the switching pin with a voltage inquiry just to see a perfect waveform and measure the right switching frequency.

    Let me know.

    Nidhi Singh

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Alex thomas
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Alex thomas
Asked: November 25, 2022In:
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Hello, I am new to STM32 and trying to learn exciting stuff. I want to light a single LED from my WS2812B strip. For example, I’ll choose the 6th LED on my computer, and the 6th LED on the strip will light ...Read more

Hello,

I am new to STM32 and trying to learn exciting stuff. I want to light a single LED from my WS2812B strip.

For example, I’ll choose the 6th LED on my computer, and the 6th LED on the strip will light up.

But I am not sure where to start. How can I access to single LED address? And how to get it to work with STM32?

Thanks in advance.

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ledoptoelectronicsstm32stripws2812b
  1. vikas Nagpal

    Welcome, to the community! The question of WS2812 has already been discussed here many times. The thread How to use HAL DMA to generate PWM on P- NUCLEO- WB, for example, also deals with it and refers to a Github driver from Tilen Majerle and a HAL example from Martin Willner. Maybe that will help yRead more

    Welcome, to the community!

    The question of WS2812 has already been discussed here many times. The thread How to use HAL DMA to generate PWM on P- NUCLEO- WB, for example, also deals with it and refers to a Github driver from Tilen Majerle and a HAL example from Martin Willner.

    Maybe that will help you?

    Regards

    Vikas

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cleaneatzkitchen
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cleaneatzkitchen
Asked: November 8, 2022In:
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Hi! I’m applying the LED Control (LEDC) PWM to control the servo motor, it worked well. And now I need to control further than 8, I’ve checked the ESP32 datasheet, and there have 16 channels can use 8 in High – ...Read more

Hi!

I’m applying the LED Control (LEDC) PWM to control the servo motor, it worked well.
And now I need to control further than 8, I’ve checked the ESP32 datasheet, and there have 16 channels can use 8 in High – speed mode, and 8 in Low – speed mode.
But the ledc library does not support low- speed mode right now, is there any way to use led pwn in low- speed mode?
Like, write the register directly?

thanks!

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datasheetespesp32espressifledledcuart
  1. Alex thomas

    Not sure if the driver does not support all 16 channels. they may just not be supporting the low- speed option of the low- speed channels. But anyway, if you want to poke at the registers yourself, the LED PWM controller is documented in the TRM. Do not forget to actually turn the peripheral on, andRead more

    Not sure if the driver does not support all 16 channels. they may just not be supporting the low- speed option of the low- speed channels. But anyway, if you want to poke at the registers yourself, the LED PWM controller is documented in the TRM. Do not forget to actually turn the peripheral on, and you should get it going enough quickly.

     

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