The IW1788-46 is a highly integrated AC/DC controller from Renesas Electronics America designed for efficient and compact power supply solutions. This controller incorporates advanced features to optimize power factor correction (PFC) and constant current (CC) or constant voltage (CV) regulation, making it ideal for a variety of applications.

Applications:

• LED Lighting Drivers
• Offline Power Adapters
• Battery Chargers
• Auxiliary Power Supplies
• Consumer Electronics Power Supplies

Features:

• Advanced PFC Control: 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.
• Open-Loop Protection: Detects and protects against open-loop conditions.
• Thermal Shutdown Protection (OTP): Prevents overheating by shutting down the controller.

Benefits:

• High Efficiency: Reduces power consumption and heat generation, resulting in energy savings.
• Simplified Design: Primary-side regulation reduces component count and simplifies circuit design.
• Reduced BOM Cost: Eliminates the need for 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 IW1788-46 leverages advanced control techniques to achieve high efficiency and power factor correction in a compact and 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. Cycle-by-cycle current limiting and leading-edge blanking further enhance its stability and reliability.