L6221CD

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The L6221CD is a monolithic dual H-bridge with full cycle-by-cycle current limiting control. This integrated circuit features an efficient, low power, high-speed, high-current capability that enables it to be used in a wide range of applications, such as power control systems, motor drive systems, isolation amplifier circuits, and audio power amplifiers.

The L6221CD is a monolithic dual H-bridge circuit, consisting of two H-bridges stacked together in a single package. Each H-bridge consists of two power switching output transistors and two control input diodes. The output transistors control the load current through a full cycle-by-cycle current limit control. This allows for higher current carrying capacity and better thermal dissipation capability.

The L6221CD operates from a 5.0V logic supply and provides both forward and reverse output current control. The output transistor control circuitry is impedance matched to the control input diodes providing maximum switching efficiency and noise reduction. The circuit has a built-in thermal shut-down protection that activates when the junction temperature exceeds a preset value.

The working principle of the L6221CD is quite simple. The control input diodes form a bridge between the transistors and the ground. When one of the control input diodes is forward biased, the current is conducted from the input side to the output side, connecting the input and the output. The output transistors then control the output current according to the input signals.

The L6221CD is suitable for a variety of applications including motor drives, power control systems, isolation amplifier circuits, and audio power amplifiers. It is also suitable for use in applications where low drive power and high switching frequency are needed, such as pinball flipper coils, vehicle reversing systems, and contactors.

Overall, the L6221CD is a highly reliable and efficient H-bridge circuit that provides full cycle-by-cycle current limiting control. It is a cost-effective solution for applications requiring high current, low drive power and high switching frequencies. Its wide range of features and advantages make the L6221CD an ideal solution for a variety of applications.

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