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Hi All,
I have a a isolator transformer and a Variac and I have been using that at home as a AC power supply. I would like to get something a bit more professional but I dont want to expend loadson money on a AC professional PSU( I can't find anything cheaper than 1500 dollars).
The main...
Hi, The IC controller work on PFM so I can change the duty cycle. To change the power transfer, I need to change the value of Rcs and to control the voltage I need to modify the value of FB1 and FB2. Primary inductance and Rcs value affect to frequency...
1667762005
Indeed, 450Khz could be too...
Hi Klaus,
Hi Klaus,
Sorry, I mixed concepts...., The input wattage is 23VA (230V and 0.1A due to low power factor) and the electrolytic capacitor is the DC input capacitor which is 10uF. The 19W figure comes from applying the below formula when the frequency, so it is the power transfer...
Hi All,
I have designed an AC/DC flyback converter that swing the power output from 1W to 19W. The output voltage is 5.2V and 2.4A at maximum power (the 19W comes from poor power factor and it is done on purpose because I have a huge C bulk of 10uf after rectification to improve EMC).
The...
Hi,
I would like to have 100mA on the LEDs, so the I led = 100mA and Vfb is by the datasheet 200mV.The Rsense (R1) in the schematic should be 2 ohms and Vdc will be 5V. I need to calculate R3 that I would like to put a potentiometer and R2 to achieve a range from 100mA to 0A.
Hi All,
I am going to do a design using this LED Driver AP3032 and I would like to include some dimming by adding a voltage to the feedback line.
Although I have an idea on how the circuit would be and I think I could try to some values until I adjust the circuit I would like to calculate the...
I have had a look to Peltier effect and it took me the seebeck effect. It is literally from google:
"The Seebeck effect is a phenomenon in which a temperature difference between two dissimilar electrical conductors or semiconductors produces a voltage difference between the two substances"...
Hi All,
When a diode heats up because the current is flowing through it, what heat ups quicker ( or more), the Anode or the Cathode? Is there any difference between Schoktty diodes, fast diodes, signal diodes relevant to the previous question?
Winsu,
Regards
Hi Dick_freebird,
Basically you think that without a little heat sink ( even if it is just a fin of a smd heat sink) it won't make any difference, right?
My problem is that the PCB will be mounted vertically and it will be under vibrations...., therefore fitting a heat sink make feel a little...
Hi All,
Would a big drop of thermal compound on top of a SMD component ( without adding a heat sink on top of it) improves its thermal?. I wouldn't expect a big improvement without a heat sink, but would it make a little bit of improvement?.
Winsu,
Cheers
Hi Klaus,
I can't change the wave form as it could impact EMC. I have already looked for others diodes that are better but I cant find anything better ( the current one is PN SK24A R3G). I have put 3 in parallel and I can't put a SMB or SMC because there is no more space. The best solution so...
Hi All,
I have a Schottky diode in a LED driver design and it is getting hot. I have already increased the number of them ( 3 at the moment ) and I can't put more diodes because of a lack of space.
The case temperature reaches 105°C at worst case conditions and the Maximum Tj of the diode is...
Hi Klaus, there is another product that is identical but hasn't got a switch ( the switch is to prove that a certain functionality works). The reason is that we would like to use the same housing for both products ( with switch and without switch ). If the new way to fit use without making holes...
Hi Klaus,
Actually the IP is not the main reason. The main reason is that they don't want to make holes to not to increase the price of the housing. Therefore the solution has to be cheaper than the increase in cost when making a hole in a housing.
Hi All,
I would like to use a capacitive switch for an application. The reason is that we don't want to make any holes on the housing for IP reasons but we need a switch for a specific feature. I have though about capacitive switches and if they could still work behind a metallic plank. The...
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