The IW1790-12B is a highly integrated AC/DC power supply controller developed by Renesas Electronics America. It is designed for applications requiring high efficiency, power factor correction (PFC), and a compact design. This controller integrates advanced features that simplify the design process for offline power supplies and LED lighting drivers, resulting in a reduced bill of materials (BOM) and improved overall system performance.

Applications:

• LED Lighting Drivers
• AC/DC Power Adapters
• Offline Power Supplies
• Battery Chargers
• Consumer Electronics Power Supplies

Features:

• High Power Factor Correction (PFC): Ensures high power factor and low total harmonic distortion (THD).
• Primary-Side Regulation (PSR): Eliminates the need for secondary-side feedback components, reducing BOM cost.
• Constant Current (CC) and Constant Voltage (CV) Control: Supports both CC and CV operation modes.
• Valley Switching Operation: Improves efficiency by reducing switching losses.
• Low Startup Current: Minimizes inrush current during startup.
• Over-Voltage Protection (OVP): Protects against output voltage surges.
• Over-Current Protection (OCP): Limits output current to prevent damage.
• Short-Circuit Protection (SCP): Shuts down the controller in case of a short circuit.
• Thermal Shutdown Protection (OTP): Prevents overheating by shutting down the controller.
• Open-Loop Protection: Detects and protects against open-loop fault conditions.

Benefits:

• High Efficiency: Reduces power consumption and heat generation, leading to energy savings.
• Simplified Design: Primary-side regulation streamlines the design process.
• Reduced BOM Cost: Eliminates secondary-side feedback components.
• Compact Size: Enables smaller and more compact power supply designs.
• Enhanced Reliability: Comprehensive protection features ensure robust operation.
• Precise Output Regulation: Provides stable and accurate output voltage and current.
• Improved Power Factor: Meets regulatory requirements for power factor correction.
• Longer Lifespan: Protects the system from various fault conditions, extending its lifespan.

Additional Details:

The IW1790-12B uses advanced control techniques to achieve high efficiency and power factor correction in a cost-effective solution. Its primary-side regulation removes the requirement for optocouplers and other secondary-side feedback components, simplifying the design and lowering the overall BOM cost. The controller is designed to operate over a wide range of input voltages and is available in a compact package. Cycle-by-cycle current limiting and leading-edge blanking are included for enhanced stability and reliability. These built-in protections guarantee a long and dependable operating life for the application.