Nmos relay driver array

From the above figures, it can be clearly seen that each Darlington pair can be used as the single power transistor. Thus, we can say that in ULN, eight power transistors are embedded. From this figure, it can be clearly seen that among eight transistor pairs, one pair is being used. To the negative terminal of the battery, the ground i. Emitter is connected. If we consider the normal situations, across the transistor, the complete voltage will appear whenever a motor will be turned off.

However, when the power is supplied to the Base, then the transistor will be in ON state. Whenever the transistor is turned ON, the current will start flowing through the motor via Collector and ultimately it will reach the Emitter i. If the power supplied to the Base is grounded, then in this case the transistor will turn off and thus the motor will stop working and in the same way, each Darlington transistor can be used to drive individual loads.

The switching delays are not considered under normal conditions but whenever the switching frequency goes beyond 2 MHz the this needs to be considered and then two parameters need to be considered and these are. Create a free website or blog at WordPress. Follow Following. Sign me up. Already have a WordPress. Log in now. Loading Comments Email Required Name Required Website. The Darlington pairs may be connected in parallel for higher current capability. Applications include a stepper motor, relay drivers, hammer drivers, lamp drivers, display drivers LED and gas discharge , line drivers, and logic buffers.

The ULN has a 2. Very low supply current per operator essentially independent of the supply voltage. We all know that the transistors are used to amplify the current but here Darlington transistor pairs are used inside the IC to make the required amplification. A Darlington pair is two transistors that act as a single transistor providing high current gain.

In this pair, the current amplified by the first transistor is further amplified by the next transistor providing a high current to the output terminal.

When no base voltage is applied that when is no signal is given to the input pins of the IC, there will be no base current and the transistor remains in the off state. Typically used in power distribution, protection and load switch applications. High Side or Low Side.

Half Bridge Drivers. Full Bridge Drivers. Typically used in BLDC motor applications. Selector Tool. Browse Products. Quick Glance: High peak output current: 12A typical Wide operating range: 4. Explore Product.