DMC5640L0R

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DMC5640L0R Application Field and Working Principle

Transistors - Bipolar (BJT) - Arrays, Pre-Biased

The DMC5640L0R is a four-channel, pre-biased NPN-transistor array developed by NXP. The four NPN individual transistors within the array are in the linear topology, each of which has two collector connections, two base connections, and two emitter connections. The transistor array made of NPN transistors suits a variety of applications, such as multimedia and consumer electronics. Compared to other transistors, the attraction point of DMC5640L0R is that it enables engineers to access multiple transistors with reduced board space, which offers a cost and space-saving advantage.

DMC5640L0R features 4 identical NPN pre-biased transistors with an integrated current mirror output and an active bias pin on the package. As a low-noise and low harmonic distortion NPN transistor array, the device is capable of accepting input signals down to VCE(SAT)=0.2 V, which is quite low compared to the standard VCE(SAT)=0.8 V with the same dynamic micro change. In addition, the device has a minimum β of 100 HFE and a collector current limit of up to 175mA.

In terms of its application, the DMC5640L0R is best suited for low noise applications that require tight matched current distribution and low power. This explained why the device used widely in applications such as audio amplifiers, loudspeaker protection, camera sensors, and other low-power audio devices.

The following section will discuss the working principle of the DMC5640L0R.

Working Principle

DMC5640L0R uses the voltage-to-current conversion principle. During the operation, the input voltage is converted into the corresponding current value and then divided into two consecutive NPN transistors. Because the base currents of the two transistors are identical, the drain current that passes through one transistor is the same as the drain current passing through the other transistor. This distribution ratio is adjustable according to the ratio of the emitter resistance. In this way, the device can achieve multiple NPN transistor current output in a small package.

The working principle of the DMC5640L0R based on two asymmetrical NPNs in parallel. In order to ensure the match between PNP and NPN transistors, the forward current with the highest is selected from the four NPN transistors in the DMC5640L0R. This output is then connected to the base of the NPN to ensure the matched transistors working properly. Once the forward current is determined, the concentration ratio between the NPN and PNP transistors can be refined to complete the voltage-to-current conversion.

Overall, the DMC5640L0R operates according to the pre-biased connection principle. With the Vh terminal, an internal current source is activated, which allows the NPN transistors to perform the voltage-to-current conversion much better. Additionally, the two external resistors perform the fine-tuning of the device to make sure the current mirror works properly.

Conclusion

To summarize, the DMC5640L0R is a 4-channel, pre-biased NPN-transistor array developed by NXP. It is mostly used in low-noise applications that require tight matched current distribution and low power. Its working principle is based on the voltage-to-current conversion principle and pre-biased connection. The DMC5640L0R features 4 identical NPN pre-biased transistors with an integrated current mirror output and an active bias pin on the package. Considering its cost and space-saving advantage, the device is best suited for a variety of applications.

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