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What kind of transistor is used in uln2803?
The datasheet of ULN2803 specifies that this chip is a high current, high voltage Darlington transistor array. In this device, eight Darlington pairs of np-n configuration are present that have the feature of high voltage outputs along with the common-cathode clamp diodes that is used to switch inductive loads.
What is the purpose of the uln2803 relay driver?
Purpose of ULN2803. Most of the Chips operates with low level signals such as TTL, CMOS, PMOS, NMOS which operates at the range of (0-5)v and are incapable to drive high power inductive loads. However this chip takes low level input signals (TTL) and use that to switch/turn off the higher voltage loads that is connected to the output side.
What can the uln2803-pin configuation be used for?
The ULN2803 chip can be used in the following cases: 1 To control the inductive loads those are making use of the logic obtained by the control unit. 2 If you are willing to drive multiple loads, then this chip can be used as it is capable of driving eight loads at a time. 3 This chip can also be used for programmable load sharing.
How is the Darlington array used in uln2803?
To control the inductive loads those are making use of the logic obtained by the control unit. In ULN2803, the Darlington array act as separate 8 individual switches and thus can be turned off and on as desired. Each set of these Darlington pair is capable of driving high power loads that use logic from the control unit.
Which is an example of a current limiting resistor?
A current limiting resistor is a resistor that is used to reduce the current in a circuit. A simple example is a resistor in series with an LED. You would usually want to have a current limiting resistor in series with your LED so that you can control the amount of current through the LED.
What are the total number of pins in uln2803?
In order to achieve the higher capability of current, Darlington pairs of np-n configuration are connected in parallel. In ULN2803, total numbers of pins are 18. The connection of these pins is as follow: Pin 1 is the base of first transistor.
What kind of relay driver does uln2803 have?
Today, I’ll discuss the detailed Introduction to ULN2803 which is a relay driver that comes with a high-voltage and high-current Darlington transistor array.
What is the logic diagram of uln2803?
Following figure shows the logic diagram of ULN2803. It is a visual representation and arrangement of how the diodes are connected in the component. Following figure shows the schematic diagram of each Darlington pair.