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EL7457CLZ-T7A Application Field and Working Principle

The EL7457CLZ-T7A integrated circuit is a monolithic power management device from the EL7457 family of components. It is a dual high-speed gate driver designed for use in power management and system power control applications. The integrated circuit is optimized for a number of applications, including the following:

• High speed pulse width modulation (PWM)
• Power supply inrush current limiting
• Gate drivers for system power supply on/off control
• Voltage regulator modules (VRMs)

The integration of high-power and high-speed gate drivers on the same chip makes it ideal for power management applications with tight size and cost constraints. The device features a parallel pass-transistor architecture that minimizes chip count and simplifies the implementation of peripheral circuits such as PFC controllers. The devices have a wide range of features, including over-voltage protection, current limiting, Voltage Doubler overlay circuitry and fault detection. The design of the EL7457CLZ-T7A provides superior performance characteristics, such as low power consumption, high-speed switching frequencies, fast turn-on/turn-off times, and low voltage/current surges.

The device offers a wide range of power supply protection features, including inrush current protection and undervoltage lockout (UVLO). The integrated dual gate driver circuit is capable of driving high current N- and P-channel power MOSFETs at short deadtimes and wide voltage swings. The device also provides a Totem-pole output on its ENABLE/DISABLE pin, allowing more accurate power control and reduced power consumption.

The EL7457CLZ-T7A is designed to be powered from 5V or higher, and it has an internal circuit which allows the device to operate from 4V to 6V. The output voltage range can be adjusted from 4V to 6V by programming the voltage pin (VON/VOFF). The device is provided in an 8-pin SOT-23 package which has an exposed die pad to facilitate enhanced heat dissipation.

Working Principle of EL7457CLZ-T7A

The EL7457CLZ-T7A is a dual gate driver featuring an internal power supply regulator, high speed pulse width modulation (PWM) logic, voltage leaker circuitry and protective features. Its internal switching regulator is powered from a 4V to 6V supply and supplies gate drivers with the bias voltage required by the gate drivers. The device uses an external bias voltage (VON/VOFF) to control the output voltage of the gate drivers. When the bias voltage is below 4V, the device is inactive and its outputs are disabled. When the bias voltage is above 4V, the outputs are enabled and the device is operational.

The PWM logic circuit uses a reference voltage from the device\'s internal DC regulator to provide PWM pulses of varying widths. This reference voltage is used along with an external potentiometer to control the width of the PWM pulses for system power management. Additionally, the device has an internal voltage leaker that automatically increases or decreases the output voltage of the gate drivers when the input voltage changes. This allows for more precise voltage control.

The EL7457CLZ-T7A also has an inrush current limit function to protect the power supply from overvoltage. The device also features overcurrent and overvoltage protection, as well as an ENABLE/DISABLE pin that can be used to turn the device on or off. Additional features include thermal shutdown, undervoltage lockout, and voltage monitoring.

Conclusion

The EL7457CLZ-T7A is an integrated circuit which is optimized for a number of applications such as power supply inrush current limiting, high speed PWM, and gate drive applications. It features a parallel pass-transistor architecture which minimizes the chip count and simplifies the implementation of the peripheral circuits. The device also has a wide range of protection and fault detection features, including inrush current protection, overcurrent and overvoltage protection, and voltage monitoring. The device is well suited for use in power management and system power control applications, due to its high-speed switching frequency and low power consumption.

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