TIUC2844AD8TR
Overview
The UC2844AD8TR is a high-performance current-mode PWM controller designed for off-line and DC-DC converter applications including Flyback and Boost topologies. It features a trimmed oscillator for precise duty cycle control, limited to a 50 percent maximum to prevent transformer saturation in single-ended converters. This controller is optimized for efficiency with a low start-up current of less than 0.5mA and includes a high-current totem pole output capable of driving MOSFET gates directly.
Why Choose This Part
The UC2844AD8TR offers enhanced load response characteristics and automatic feedforward compensation, which simplifies the design of stable feedback loops. Its integrated undervoltage lockout with hysteresis ensures reliable startup and shutdown transitions, while the double pulse suppression logic prevents multiple output pulses per oscillator cycle.
Applications
Key Specifications
Getting Started
Designers should begin by calculating the timing resistor and capacitor values to set the switching frequency up to 500kHz. Ensure the VDD supply remains between 11V and 30V for stable operation, and utilize the 8-SOIC footprint for compact surface-mount PCB layouts. Evaluation can be performed using standard current-mode PWM prototyping boards or by following the recommended application circuits in the TI datasheet.
