The IW1790-08B is a highly integrated AC/DC power supply controller designed by Renesas Electronics America. It is optimized for applications requiring high efficiency, power factor correction, and compact size. This controller integrates advanced features to simplify the design of offline power supplies and LED lighting drivers.

Applications:

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

Features:

• High Power Factor Correction (PFC): Achieves high power factor and low total harmonic distortion (THD).
• Primary-Side Regulation (PSR): Simplifies design and reduces component count.
• Constant Current (CC) and Constant Voltage (CV) Control: Supports both CC and CV operation modes.
• Valley Switching: 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: Protects against open-loop fault conditions.

Benefits:

• High Efficiency: Reduces power consumption and heat generation.
• Simplified Design: Primary-side regulation eliminates secondary-side feedback components.
• Reduced BOM Cost: Minimizes the number of external components required.
• 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.

Additional Details:

The IW1790-08B utilizes advanced control algorithms to achieve high efficiency and power factor correction in a cost-effective solution. Its primary-side regulation eliminates the need for optocouplers and other secondary-side feedback components, simplifying the design and reducing the overall BOM cost. The controller is designed to operate over a wide range of input voltages and is available in a compact package. The device also features cycle-by-cycle current limiting and leading-edge blanking for enhanced stability and reliability. The built in protections ensure a long and trouble free operating life.