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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.
What’s the purpose of the internal low-side switch in LED5000? Is it a synchronous converter? If so, also why is an external Schottky shown in the application diagrams?
What’s the purpose of the internal low-side switch in LED5000? Is it a synchronous converter? If so, also why is an external Schottky shown in the application diagrams?
Read lessWe’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!
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.
Read less
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.
See lessHi everyone I’m going to use STLD40D Driver IC for my TFT LCD. For driving LCD backlight, I’v chosen this Driver from ST. But I can’t figure out the function theory of this driver. could you please explain for me the STLD40D ...Read more
Hi everyone
I’m going to use STLD40D Driver IC for my TFT LCD. For driving LCD backlight, I’v chosen this Driver from ST. But I can’t figure out the function theory of this driver.
could you please explain for me the STLD40D function theory and how to use that?
thank you in advance.
Read lessWell, the STLD40D is a boost converter. The function is also described in the data sheet, section5.1. It must be taken into account that the converter not only has a min off time, but also a maximum on time. The switch- on moment is particularly interesting firstly there's no FB signal, so the powerRead more
Well, the STLD40D is a boost converter. The function is also described in the data sheet, section5.1.
It must be taken into account that the converter not only has a min off time, but also a maximum on time.
The switch- on moment is particularly interesting firstly there’s no FB signal, so the power stage is switched on( SW to GND), which charges the boost inductor. As there isn’t yet enough affair voltage to drive a current through the LEDs, pin FB remains zero. still, the maximum on time now kicks in and switches the power stage off again, whereby the energy stored in the boost inductor is delivered to the LEDs at a high voltage and results in a corresponding current and a signal to FB. From now on, FB can regulate normally.
Dear All, I want to develop 18W LED bulb in A65 Housing pls suggest me…
Dear all, i am facing one technical issue regarding LED CHIP 2835 found 1 led burn out of 20Nos. in a single light. What can be happens. pls help me. in same product found driver having no issue.
Dear all,
i am facing one technical issue regarding LED CHIP 2835 found 1 led burn out of 20Nos. in a single light. What can be happens. pls help me. in same product found driver having no issue.
Read lessI’ve 36 leds on my board. I’ll connect dimmer my board. How can i adjust leds brightness with dimmer? Because i need to manage 36 output pins. How can i do it?
I’ve 36 leds on my board. I’ll connect dimmer my board. How can i adjust leds brightness with dimmer? Because i need to manage 36 output pins. How can i do it?
Read lessYou can DMA to the io pins (using a indirect buffer, transferring to GPIO output register). I controlled 48 Leds (16 RGB Leds) this way using a STM32L4(100 LQFP package). But this was to give independent brightness situations to each individual Led. But if all Leds are dimmed together (synchronised)Read more
You can DMA to the io pins (using a indirect buffer, transferring to GPIO output register). I controlled 48 Leds (16 RGB Leds) this way using a STM32L4(100 LQFP package). But this was to give independent brightness situations to each individual Led.
But if all Leds are dimmed together (synchronised), also you probably only need a single FET to sink all the Leds current, and use that FET to control the brightness (PWM)
See lessI’ve a design. I’ve 13 switch and these switches control to leds. For example when i click first button, first led will be on( likewise when i click again, it’ll be out). So microcontroller want to knows everything about it. ...Read more
I’ve a design. I’ve 13 switch and these switches control to leds. For example when i click first button, first led will be on( likewise when i click again, it’ll be out). So microcontroller want to knows everything about it. But how can i control these leds? Because i want 36 * 3 io pins( RGB). Similarly after i want to control lightness of all leds with dimmer.
Do you have any IC hints for leds control & leds pwm controller?
Read lessThere are numerous LED drivers also from STMicroelectronics, e.g. LED1202 LED1642GW etc ( see LED Array Drivers STMicroelectronics) Of course, the correct type depends on several factors, e.g. how you want to control the LEDs( I2C, SPI, etc). With RGB LEDs you'll clearly only switch one LED per chanRead more
There are numerous LED drivers also from STMicroelectronics, e.g.
LED1202
LED1642GW
etc ( see LED Array Drivers STMicroelectronics)
Of course, the correct type depends on several factors, e.g. how you want to control the LEDs( I2C, SPI, etc). With RGB LEDs you’ll clearly only switch one LED per channel, so you should be suitable to get by with one LED driver for 5V.
See lesshow to resolve led not glow equal during dc operation(3v/1.4mA , 112 led in parallel ) issues in 4ft batten .
how to resolve led not glow equal during dc operation(3v/1.4mA , 112 led in parallel ) issues in 4ft batten .
Read less
hi as per my advise you can use 2 option Since there are 112 leds used in parallel and there is a very low voltage and high current, you should change your series and parallel configuration. You can do this by changing the track width on your PCB board and by installing a CC IC, which will boRead more
hi as per my advise you can use 2 option
You can do this by changing the track width on your PCB board and by installing a CC IC, which will boost the current and give each led an equal amount of current then your issue will be resolved.
Thanks
See less
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.
Read less
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).
See less
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!
See lessStill, you need to use LBO output to shut down accordingly, If you require to shut down the output.