ICE3BR1765J: A Comprehensive Technical Overview
The ICE3BR1765J stands as a prominent member of Infineon's CoolSET™ family, representing a highly integrated switching mode power supply (SMPS) controller IC. It is specifically engineered for offline power supplies, combining a robust current-mode PWM controller with a 700V CoolMOS™ power transistor. This integration is designed to significantly enhance energy efficiency, reduce component count, and simplify the design of power supplies for applications such as adapters, LCD TVs, and home appliances.
At the core of the ICE3BR1765J is its advanced control methodology. The current-mode control ensures excellent line and load regulation, providing a stable output voltage despite fluctuations in input voltage or output current. This is further augmented by built-in protections, including over-current protection (OCP), over-voltage protection (OVP), and over-temperature protection (OTP), which safeguard both the IC and the overall system from fault conditions, thereby improving long-term reliability.
A key feature of this IC is its quasi-resonant (QR) operation. Unlike conventional fixed-frequency PWM controllers, the QR mode allows the integrated MOSFET to switch on at the minimum drain-source voltage (valley switching). This technique drastically reduces switching losses and electromagnetic interference (EMI), leading to higher overall efficiency, especially under light-load conditions. This makes it an ideal solution for meeting stringent global energy efficiency standards like ENERGY STAR.
The device also incorporates a startup cell that draws power directly from the high-voltage DC bus, minimizing the need for external auxiliary components. Furthermore, its low operating current contributes to low standby power consumption. The integration of frequency shuffling to spread EMI spectrum and a comprehensive set of protection features into a single 8-pin DIP or SMD package exemplifies a design philosophy centered on miniaturization and cost-effectiveness.
The ICE3BR1765J is a highly integrated, efficient, and reliable SMPS controller IC from Infineon. Its combination of a 700V MOSFET, quasi-resonant operation for high efficiency, and a full suite of protection features makes it an exceptional choice for designing compact, robust, and energy-efficient offline power supplies.
Keywords:
1. Quasi-Resonant
2. Current-Mode Control
3. Integrated 700V MOSFET
4. Over-Current Protection (OCP)
5. Energy Efficiency
