prabhukaran3
Member level 5
Hi All,
I am using High Power LED for my project. To Dim the brightness of LEDs I have bought IRF450N(TO-220) Package.
I am using 15V SMPS. 5 LED are connected in series. I gave +15V to one end of seriesly connected LEDs(say Anode). Cathode of Fifth LED is connected to Gate of IRF540N. Source is connected to Ground. For Gate I have used 1K resistor.. I am using PWM signals to generate ground pulsed to Swith ON LEDs.
My problem is LEDs are glowing very Dull. Say 5% brigtness. But anyhow I can Dim the LEDs. What is the problem here? I have refered another one Board. There they have used 30V to SMPS and the have connected 10 LEDs in series..
My doubt is about IRF540. In the datasheet they said VDSS =100V..I think there should be minimum voltage level for Drain(Above 20 I think).. Am I correct?
I am using High Power LED for my project. To Dim the brightness of LEDs I have bought IRF450N(TO-220) Package.
I am using 15V SMPS. 5 LED are connected in series. I gave +15V to one end of seriesly connected LEDs(say Anode). Cathode of Fifth LED is connected to Gate of IRF540N. Source is connected to Ground. For Gate I have used 1K resistor.. I am using PWM signals to generate ground pulsed to Swith ON LEDs.
My problem is LEDs are glowing very Dull. Say 5% brigtness. But anyhow I can Dim the LEDs. What is the problem here? I have refered another one Board. There they have used 30V to SMPS and the have connected 10 LEDs in series..
My doubt is about IRF540. In the datasheet they said VDSS =100V..I think there should be minimum voltage level for Drain(Above 20 I think).. Am I correct?