Product Overview: UC3843D8TR

The UC3843D8TR is a high-performance current mode pulse width modulator (PWM) controller from Texas Instruments. This integrated circuit is designed to facilitate the development of a range of power supply applications, particularly those requiring a minimal number of external components for a compact and efficient design.

The UC3843D8TR operates at a fixed frequency which is set by an external resistor and capacitor. The device features an automatic feed-forward compensation and a latch for single pulse metering, which are both essential in maintaining stability and accuracy under a variety of conditions. Its trimmed oscillator discharge current helps in setting a consistent and precise duty cycle limit, which is critical for many power supply designs.

With an operating voltage range of 12V to 25V and a reference voltage of 5V±1%, the UC3843D8TR is versatile enough to handle a wide array of applications, from simple low-power converters to sophisticated switching power supplies. It also boasts a low startup current of less than 0.5mA, which makes it an energy-efficient choice for battery-operated devices.

Safety features are a paramount concern in power management, and the UC3843D8TR includes several protective measures. It has an under-voltage lockout with hysteresis, ensuring that the device operates only when the supply voltage is within an acceptable range. Additionally, the overcurrent protection is implemented via a current sensing comparator, which adds another layer of security for the connected components.

The UC3843D8TR comes in a compact 8-pin SOIC package, making it ideal for space-constrained applications. Its thermal shutdown feature ensures that the device operates within safe temperature limits, thereby prolonging its lifespan and reliability. Whether you are designing an AC-DC converter, a DC-DC converter, or a battery charger, the UC3843D8TR provides a robust foundation for your power management solution.

Key Features:

• Current mode operation
• Automatic feed-forward compensation
• Fixed-frequency PWM control
• Low startup current (
• Under-voltage lockout with hysteresis
• Overcurrent protection
• Trimmed oscillator for precise duty cycle control
• 5V reference voltage (±1% accuracy)
• Thermal shutdown
• 8-pin SOIC package