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Questions tagged [darlington]

A structure containing two of the same BJT, used for its increased current gain compared to a single BJT.

3
votes
1answer
3k views

NPN vs PNP at H bridges

Lots of different darlington pairs datasheets indicates that NPN are faster(lower rise and fall times), stronger(has a higher Hfe and bigger current maximum) and because of gate source tension, easier ...
-1
votes
1answer
383 views

Voltage to current converter

In the circuit diagram, R11 is the DUT across which current needs to be measured. According to tests performed on the device, the output current is 1A for sinusoidal input of amplitude 10V and ...
10
votes
3answers
8k views

Resistors within a Darlington transistor

I've been considering replacing a 2N3904 and TIP31C with a TIP102 in one of my circuits (PWM LED dimmer), and have noticed in the TIP102 schematic resistors leading from each of the bases to the ...
3
votes
3answers
3k views

Any IC similar to ULN2003A with latch or enable/disable?

I'm working on a project that uses a ULN2003A (darlington transistor array) and I need to enable/disable it. The point is that ULN2003A does not have enable/disable pin. I think that a IC with latch ...
1
vote
2answers
417 views

Sink current for TLP521 via 74HC595 or ULN2803A

I have a TLP521 driving a set of relays. The circuit is shown below. To switch on the relay, I will need to sink the current to complete the P521 circuit, which will trigger the relay. I am ...
0
votes
1answer
435 views

Is it possible to sink and source from one output pin using a darlington driver

Sinking and sourcing with a darlington driver I asked a question about sinking and sourcing LEDs while using a darlington driver. The images were slightly unclear so i have redrawn it. I had too many ...
0
votes
2answers
255 views

Sziklai Darlington Transistor Configuration

I'm building a infrared 38khz emitter and I would like to use 4 or 5 LED in multiples directions. I found this article, where in the end it shows a Sziklai Darlington schematic and dont use resistors....
0
votes
0answers
69 views

Darlington Transistor TIP142 same type but different values

I have a bunch of Darlington NPN Transistors TIP142 that are removed from two separate identical boards. The 1st one have the TO−218 CASE (left side of the image) and the 2nd the TO−247 CASE (right ...
0
votes
0answers
200 views

Driving a DC motor (in one direction) with a microcontroller pin and an opto-isolator

I'm supposed to design a circuit for driving a DC motor with an opto-isolator and a microcontroller pin. The motor is supplied with 12V, and its power is 5W. The opto-isolator has to isolate the ...
0
votes
0answers
212 views

Sinking and sourcing with a darlington driver

I was making my circuit with around 60 LEDs with a microcontroller when i realised that i didn't have enough voltage for all the LEDs. I am going to add a darlington driver on another board, so the ...
0
votes
1answer
600 views

Driving IRF540N with darlington

I'm trying to drive MOSFETs with 3.3V PWM signal. Here is a (probably bad) circuit: I know that a darlington is not the best thing to drive a mosfet with. But actually I need to drive many of them ...