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51 Threads found on edaboard.com: Pwm For Leds
Hi, usually one does not need to have both parameters variable. The usual way is to set the 100% current for the leds with the resistor and do the brightness adjust with the pwm duty cycle. **** If you want the current to be variable, then you could use different shunt resistors and MUX the signal, or add a series resistro to the CS+ (...)
Hi Everyone, I am using MCU C8051F972-A-GM in my project . I have 6 leds in my board connected to the GPIO pins of the MCU. I want to design a circuit for constant current control with supply current in uA(when all leds are OFF) and with pwm dimming. I searched for the Constant current LED drivers with (...)
This 60W to 72W watt load at half power will also dissipate 50% of the power in the MOSFET. Not good. A slow rising pwm from 0 to 100% with 8 bit resolution might be better. with 12 V leds driven with a 30A Mosfet for low drop voltage from logic gate levels. This might be done with 3 clocks. 1) a step clock 0.284Hz for (...)
Hi! I have problems with MOSFET overheating, while switching resistive load (resistor and leds). for driving a MOSFET (I'd tried with two different ones - FDD8444 and NTD3055L104) I'm also using a driver MCP1416. I've made some images with oscilloscope. Can someone explain me what is going one? Why is there a curve on the top of the square signa
Thanks, but supposing we are pwm dimming a 48V string of leds....then the current to the leds is going on and off, and the voltage across them has a ripple in it in phase with the pwm dimming, so in this case of pwm dimming, does the AC limit apply?, since there is an AC content to the LED current (...)
Pulse Width Modulation (pwm) is used to dim an LED. If the duration of flashes is less than 30ms then the LED will appear dimmer.
Dear all, First of all, hi I'm Philip and nice to meet you all:) I'm a designengineering student from Delft. My question is farily simple, I'm looking to make a dimmable high power LED setup. The LED chould be dimmable by using the pwm signal from the arduino. Something like this; 114254 I want the driver to b
Hello. I'm planning to build a PCB with 4 leds. I'm considering to buy the following LED component to use: I don't know much about brightness levels, but I want something for signalli
I'm not sure what the connection between a buck converter and a pwm LED dimmer are. A buck converter is used as a voltage regulator. What do you mean by "leds in a buck converter"? Regardless, it's a pretty simple task to control the brightness of an LED with pwm. You could use the built-in pwm controller found in many (...)
See attached file. In pwm if duty cycle is more then ON time of pulse is more i.e., high state of pulse is more. More the duration of ON time more the brightness of leds. If PNP transistor is used for Comman Anode connection then base needs 0 to turn ON the transistor. If duty cycle is more then OFF time of pulse will be less. So, transistor (...)
I know there are plenty of ideas online, but they are not what I'm looking for. What AREN'T they what you looking for? You could use a pwm method to ramp up/down your average current.
All depends on what you want. LED drivers only generate a suitable current for a LED to operate and survive a long time. A standard LED connection is with a series resistor that limits the current from a given voltage power supply. Instead of this resistor, new drivers use pulse width modulation (pwm) to send shorter pulses of a higher current thro
This datasheet (it's of the 3-legged kind) says you have to pwm both colors/leds. No. It literally says Colors between the two chips can be generated by independently pulse width modulating the LED chips. The difference is betweeen "have to" and "can". pwm is in fact often used for this kind of bicolor (...)
Hi, I just had a simple question. If I have a 1.5 volt battery source and 1 V rated leds, is it okay for me to have a ladder of 20 rungs, with each rung having 2 leds in series WITHOUT a current limiting resistor? I also know that it would be better for me to have a constant current source, or a pwm at (...)
Go to page 12 of the datasheet ( ). Low to VFB_SEL will set a feedback voltage of 32mV. High to VFB_SEL will set a feedback voltage of 202mV. Low to pwm will disable Pulse Width Modulation. High to pwm will enable Pulse Width Modulation. Low to ENB will set the device in standby mode. High to ENB wi
The main purpose of making this construction was to create a device that uses pwm. The set consists of: programming connector 4 leds 4 buttons temperature sensor DS18B20 on 1-wire bus
hello, what is the suitable frequency range for the pwm control of a: 1)motor 2) Dimming of LED?
Most 3W leds draw high current, maybe up to 1 Amp so those transistors are far too small. A power FET will normally out-perform a bipolar transistor in low voltage high current pwm because they tend to have lower saturation voltages. This means lower heat dissipation and more current available to the LED. Brian.
Try BAM (Binary Angle Modulation) instead of pwm. Batsocks - LED dimming using Binary Code Modulation - Binary Code Modulation It is most effective way to control brightness of LED's. You can use it with shiftpwm. There is a shiftpwm examlple for controlling of 768 LED?s at 32 brightn
this is the pwm initialization code which I used for audio out. Any way, you just read the pwm part in the datasheet and then try to understand the below code. void pwm_init() { TRISC1=0; T2CKPS1=0; T2CKPS0=0; PR2=0x50; CCPR2L=0x17; TMR2ON=1; CCP2CON=0b00001100; (...)