What is ULN 2004?
Description. The ULN2001, ULN2002, ULN2003 and ULN 2004 are high-voltage, high-current Darlington arrays each containing seven open collector Darlington pairs with common emitters. Each channel is rated at 500 mA and can withstand peak currents of 600 mA.
What are Darlington arrays?
Darlington devices are high-voltage, high-current switch arrays containing multiple open-collector Darlington pairs or multiple Darlington transistors with common emitters, and integral suppression diodes for inductive loads.
How many Darlington arrays are there in the IC ULN 2803?
eight NPN Darlington pairs
The ULN2803A device is a 50 V, 500 mA Darlington transistor array. The device consists of eight NPN Darlington pairs that feature high-voltage outputs with common-cathode clamp diodes for switching inductive loads. The collector-current rating of each Darlington pair is 500 mA.
What is the main purpose of Darlington configuration?
➨It allows designers to drive more power applications by few mA of current source. ➨It is very sensitive to current. ➨Photo-Darlington pair introduces less noise than photo-transistor with external amplifier.
How does Darlington amplifier work?
In electronics, a multi-transistor configuration called the Darlington configuration (commonly called a Darlington pair) is a circuit consisting of two bipolar transistors with the emitter of one transistor connected to the base of the other, such that the current amplified by the first transistor is amplified further …
What is the main function of Darlington transistor?
A Darlington transistor acts as a single transistor with high current gain, it means that a small amount of current is used from a microcontroller or a sensor to run a larger load.
Does your ULN change?
Learners will retain the same number for accessing their Personal Learning Record throughout their lives, whatever their level of learning and wherever they choose to participate in education, training and learning.
What is the function of ULN2003?
Applications. Typical usage of the ULN2003A is in driver circuits for relays, lamp and LED displays, stepper motors, logic buffers and line drivers.
