ICW ICW4009B

ICW4009A/B is a high-efficiency, high-precision non-isolated buck switching power supply constant voltage control driver IC. It is suitable for non-isolated Buck and Buck-boost topologies with a full input voltage range of 85VAC to 265VAC, and is especially suited for driving power supplies in small appliances and white goods. It integrates an internal high-voltage power transistor and operates in constant voltage control mode, supporting both CCM and DCM operation. A proprietary PFM control scheme is employed to improve audio noise performance. The peripheral application circuit is simple with high reliability. Multiple protection features are included, such as VCC clamp/undervoltage protection, output short-circuit protection, inductor overcurrent protection, and over-temperature protection.

• Integrated 800V power transistor
• Constant voltage control, fixed 12V output voltage
• Built-in proprietary peak current control, no CS resistor required
• Built-in startup circuit, no startup resistor required
• Excellent dynamic performance
• Excellent EMI characteristics
• Excellent output load regulation
• Low standby power consumption <75mW
• Excellent audio performance across full load range
• Multiple protection features

• Open-frame power supplies for small appliances and white goods