Product Overview: UC3845DTR from Texas Instruments

The UC3845DTR is a high-performance current mode pulse width modulator (PWM) controller from Texas Instruments, designed for off-line and DC-to-DC converter applications. This integrated circuit (IC) offers an optimal solution for power supply designs by providing all the necessary features to implement fixed-frequency, current-mode control schemes with minimal external components.

This device is an extension of the UC384x family of control ICs and provides several enhancements over its predecessors. With an operational temperature range of -40°C to 85°C, the UC3845DTR is suitable for various industrial applications. It comes in a compact surface-mount package, specifically the 14-pin SOIC (Small Outline Integrated Circuit) form factor, which is ideal for space-constrained applications.

Key Features:

• Enhanced Performance: The UC3845DTR features a trimmed oscillator for precise duty cycle control, a temperature-compensated reference, high gain error amplifier, current sensing comparator, and a high current totem pole output for driving a power MOSFET.
• Protection Mechanisms: Built-in under-voltage lockout with hysteresis, overcurrent protection via current sense comparator, and an automatic feed-forward compensation improve the reliability and safety of the power supply.
• High Flexibility: The device provides programmable output turn-on and turn-off delays, which allows for better control of the power stage and enables power-saving modes for increased efficiency.
• Wide Input Voltage Range: It is designed to operate with an input voltage range that accommodates variations in the supply voltage, making it versatile for use in a wide array of power systems.

Applications:

The UC3845DTR is widely used in various power conversion applications, including:

• Switch-mode power supplies (SMPS)
• DC-DC converters
• Power inverters
• Battery chargers
• LED drivers
• Telecom power systems
• Industrial power systems

With its robust design and comprehensive feature set, the UC3845DTR from Texas Instruments is a go-to PWM controller for designers looking to create efficient and reliable power supply systems.