UCC28C43DR.pdf
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The UCC28C43DR is part of TI's high-speed PWM controller family optimized for efficient, low-power offline power designs. Below are the key engineering considerations that define its performance characteristics and application suitability.
The device uses peak current-mode control to provide superior line regulation, fast transient response and simplified loop compensation. It is ideal for flyback, forward and other isolated topologies.
Supports operation up to 1 MHz, enabling compact transformer designs and smaller output filter components. The fast response makes it suitable for dynamic industrial and communication power rails.
The controller features a low startup current of typically 50 μA and reduced standby consumption, helping meet modern energy-efficiency standards.
Includes cycle-by-cycle current limiting, under-voltage lockout (UVLO), output saturation control and protection against excessive duty cycle, ensuring stable operation under fault or overload conditions.
Designed for harsh operating environments, offering stable characteristics across a wide temperature range and varying input conditions. Suitable for industrial-grade and offline AC/DC applications.
Packaged in the standard SOIC-8 (DR) outline, the device supports easy PCB layout, reliable automated assembly and compatibility with existing power-supply footprints.
| Input Supply Voltage | 7.6 V – 30 V (typical operating range) |
|---|---|
| Switching Frequency | Up to 1 MHz, set by external timing components |
| Startup Current | ≈ 50 μA (very low power) |
| Operating Current | 2.3 mA (typ., at 52 kHz switching) |
| UVLO Threshold | Turn-on: 16 V, Turn-off: 10 V (typ.) |
| Control Method | Peak current-mode control |
| Package | SOIC-8 (DR), RoHS compliant |
| Temperature Range | −40 °C to +105 °C (industrial) |
The UCC28C43DR's 8-pin SOIC layout includes these main functions:
• COMP – Error amplifier output / compensation
• VFB – Feedback input
• CS – Current-sense input
• RC – Oscillator timing network
• GND – Ground
• OUT – Gate driver output to MOSFET
• VCC – Supply input
• REF – 5 V reference output (for biasing and control circuits)
The UCC28C43DR is packaged in the widely used SOIC-8 (DR) package, offering mechanical stability, low thermal resistance and compatibility with automated production processes.
Designers should follow TI's recommended land pattern and thermal guidelines to ensure reliable solder joints and stable performance in high-frequency switching applications.
Flyback, forward and quasi-resonant supplies used in consumer electronics, industrial modules, monitors, printers and power adapters.
Provides efficient auxiliary rails for larger power systems, especially where low standby power is required.
PLCs, motor drives, automation equipment and general-purpose offline converters requiring stable PWM operation.
Used in telecom base stations, networking power modules and distributed DC systems needing high-speed switch-mode control.
Similar devices to UCC28C43DR include other current-mode PWM controllers from TI such as the UCC28C4x family, as well as comparable controllers from onsemi, Microchip and STMicroelectronics.
Texas Instruments is a globally recognized leader in power management ICs, offering long-term support, comprehensive documentation and reliable supply for industrial and commercial applications.
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