UC3843BDTR

The UC3843BDTR is a high-performance, fixed-frequency current-mode PWM (Pulse Width Modulation) controller specifically designed for offline and DC-to-DC converter applications. It offers a cost-effective solution for designers by requiring minimal external components.

Key Features

1. High-Performance Current-Mode Control: The UC3843BDTR employs current-mode control techniques, providing fast transient response and excellent line and load regulation.
2. Fixed-Frequency Operation: The IC operates at a fixed frequency, typically 500 kHz, allowing for simpler filter design and reduced component count.
3. Trimmed Oscillator: The internal oscillator is trimmed for precise frequency control, ensuring stable operation over a wide range of conditions.
4. Undervoltage Lockout (UVLO): The UC3843BDTR features UVLO protection to prevent operation under unsafe voltage conditions, safeguarding both the IC and the load.
5. High-Current Totem Pole Output: The totem pole output stage is capable of sourcing or sinking high peak currents, making it ideal for driving N-channel MOSFETs.
6. Automatic Feed-Forward Compensation: The IC incorporates automatic feed-forward compensation, simplifying the design of the error amplifier compensation network.
7. Latching PWM for Cycle-by-Cycle Current Limiting: The latching PWM feature provides cycle-by-cycle current limiting, protecting the power supply and load from overcurrent conditions.
8. Package Type: The UC3843BDTR is packaged in a SOP-8 package, providing a compact and efficient footprint for PCB integration.

Applications

The UC3843BDTR is suitable for a wide range of applications, including:

• Offline power supplies
• DC-to-DC converters
• Battery chargers
• LED drivers
• Motor control systems

Operating Conditions

• Operating Voltage Range: Typically 10V to 30V, with specific UVLO thresholds ensuring safe operation.
• Maximum Operating Temperature: Up to +105°C (with derating above +70°C for some versions).
• Minimum Operating Temperature: Typically -40°C.

In summary, the UC3843BDTR is a versatile and high-performance PWM controller IC that offers a combination of features making it an excellent choice for a wide range of power supply and motor control applications. Its fixed-frequency operation, high-current output stage, and UVLO protection provide robust and reliable performance, while its compact package and low external component count make it easy to integrate into various systems.