BAV70,LM

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Rectifiers are essential portions of many electrical and electronic circuits. They are used to convert alternating current (AC) to direct current (DC), a process known as rectification. Diodes and rectifier arrays provide cost-effective solutions for various rectifier applications. The BAV70, LM is one rectifier option, and looking at its application field and working principle is key to understanding how a rectifier works in general.

Rectifier circuits are employed in power supplies, radios and electronic boards from very simple to very complex varieties. In motor-control systems, rectifiers convert the AC mains voltage in a DC source for the electrical motor that triggers its commands. Moreover, in various communication systems such as cable modem, rectifier circuits are used as line conditioners to produce a steady output voltage.

The BAV70, LM is a dual-channel, low voltage, 350 mArectifier array. It includes two independent series diodes in one extremely small package, making it more cost effective than other solutions. Since the device is also a low voltage device, it can be safely used in circuits that operate from a smaller voltage range. With its high voltage-blocking capability (BV= 70V), it is suitable for various applications in the automotive industry and telecommunication equipment. These include high-efficiency DC-DC converters, cellular phones, and smart phones, as well as voltage switching regulators in automotive applications.

The BAV70, LM employs the ‘Full Wave Bridge Rectification’ technique. This includes four diodes connected in a bridge arrangement and connected across a load, so that each diode is forward biased during each half-cycle of the AC supply, as shown in Figure 1.

When the supply voltage is applied to the terminals of the bridge rectifier, the output at the point A will always be positive with respect to B and vice versa, thus allowing for the full wave rectification process to be completed. The output obtained at the terminals A and B is pulsating direct current, where the frequency corresponds to that of the input AC supply.

In Figure 2 (below), a single-phase full wave rectifier circuit using the BAV70, LM is shown. The BAV70, LM is connected in a bridge configuration and is coupled with the input AC source and the output load resistor.

At the input of the bridge, the BAV70, LM carries the positive and negative halves of the AC sine wave signal, respectively. When the signal is positive (the top of the diagram), diodes D1 and D4 are forward biased, while diodes D2 and D3 are reverse-biased. This allows the current to flow through the assembly and the output voltage to increase in magnitude. Similarly, during the negative half of the wave, diodes D2 and D3 are forward biased while diodes D1 and D4 are reversed biased. Thus, the current flows through the assembly in the opposite directions, resulting in cathode and anode reversal in the output signal. The reversed waveforms are rectified above the zero axis, and since the waveforms are ideal, no appreciable amount of ripple will be present.

The BAV70, LM is an ideal device when it comes to full wave bridge rectification. Its low voltage operation, high voltage blocking capability and its cost-effectiveness makes it useful for many rectifier applications in various industries, including automotive and telecommunications. Its full wave bridge rectification technique also helps it to provide a pulsating DC output, with no appreciable amount of ripple which is essential for proper circuit operation.

When it comes to rectifier arrays and diodes, the BAV70, LM is an increasingly popular choice. Its key features make it a great option for most rectifier applications, and understanding its application field and working principle is essential for circuit design and operation.

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