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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 ...
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
4k 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
438 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
0answers
79 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
2answers
308 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
233 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
1answer
687 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 ...
0
votes
1answer
457 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 ...