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PMIC - Voltage Regulators - DC DC Switching Controllers

The E-UC3843BD1013TR is a monolithic integrated circuit that is part of a family of DC/DC switching controllers from the E-UC3843 series. This circuit is a current-mode, fixed-frequency Pulse Width Modulator (PWM) IC designed to provide a regulated output voltage in off-line and DC-to-DC converter applications. It is suitable for use in flyback, forward and half-bridge topologies and operates in all standard modes of operation.

The E-UC3843BD1013TR can be used in a wide variety of applications such as AC-DC, DC-DC, telecom, and computer equipment, lighting and audio power supplies. It is also ideal for providing local output voltage regulation in distributed power systems and battery-operated systems.

Features of the E-UC3843BD1013TR

• High-efficiency PWM control
• Wide input voltage range: 9V to 50V
• Fixed frequency internal oscillator
• Low start-up and shutdown current
• Automatic Pulse-by-Pulse current limiting
• Full protection: under-voltage lockout, over-voltage and over-temperature protection
• Under-voltage sensing circuit

Working Principle

The E-UC3843BD1013TR IC uses current-mode control for regulating the output voltage. Current-mode control works by sensing the output current and then controlling the duty-cycle of the PWM based on the sensed current. This enables the circuit to react quickly to sudden changes in output load current.

The E-UC3843BD1013TR has a fixed frequency oscillator which is used to generate the PWM signal as well as to detect the output current. The oscillator frequency is set internally and can be adjusted using an external resistor-capacitor circuit. The PWM signal is then used to drive an external power switch such as an N-channel MOSFET.

Protection Features

The E-UC3843BD1013TR provides several protection features to protect the IC, the load, and the external power switch from damage. These protection features include:

• Under-voltage lockout
• Over-voltage protection
• Over-temperature protection
• Automatic pulse-by-pulse current limiting

The under-voltage lockout feature will disable the output voltage if the input voltage drops below a certain threshold. This prevents the output voltage from dropping too low and damaging the IC, the load, or the power switch.

The over-voltage protection feature will detect when the output voltage is too high and will disable the output voltage, thereby protecting the IC, the load, and the power switch from damage.

The over-temperature protection feature will detect when the internal temperature of the IC is too high, and will disable the output voltage until the temperature falls back to a safe level. This prevents the IC from overheating and damaging itself.

The automatic pulse-by-pulse current limiting feature will detect when the load current exceeds a certain level, and will disable the output voltage until the load current drops back to a safe level. This helps to prevent the IC, the load, and the power switch from damage due to overloading.

Conclusion

The E-UC3843BD1013TR is a high-efficiency current-mode PWM IC that is suitable for use in a wide variety of off-line and DC-to-DC converter applications. It provides several protection features to protect the IC, the load, and the external power switch from damage. With its wide input voltage range, fixed-frequency oscillator, and low start-up and shutdown current, the E-UC3843BD1013TR is an excellent choice for most DC-to-DC converter applications.

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