Infineon ICE2BS01: An Integrated SMPS Controller for High-Efficiency Low-Power Applications

The relentless drive for energy efficiency and miniaturization in consumer electronics, adapters, and auxiliary power supplies (AUX) demands highly integrated and optimized controller ICs. Addressing this need, the Infineon ICE2BS01 stands out as a monolithic, fixed-frequency Switched-Mode Power Supply (SMPS) controller engineered specifically for high-efficiency, low-power applications. This integrated circuit combines critical control, protection, and driving functions into a single 8-pin package, simplifying design and enhancing reliability.

At its core, the ICE2BS01 operates on a current-mode control architecture. This approach offers superior line regulation, inherent cycle-by-cycle current limiting, and simplified feedback loop compensation compared to voltage-mode control. The controller is designed for Discontinuous Conduction Mode (DCM) operation in flyback converter topologies, which is the standard for power levels up to approximately 25W. This mode of operation reduces switching losses in the main power MOSFET and minimizes reverse recovery issues in the output diode, contributing significantly to the overall high conversion efficiency.

A key feature of this IC is its high level of integration. The chip incorporates a built-in 700V avalanche-rugged power MOSFET, which dramatically reduces external component count. This integration not only saves valuable PCB space but also enhances system reliability by eliminating the need for external discrete MOSFET connections. Furthermore, the controller includes a startup cell, eliminating the necessity for an external startup resistor and further improving light-load efficiency.

The ICE2BS01 is engineered for robust and safe operation. It encompasses a comprehensive suite of built-in protection features including:

Overload Protection (OLP): Safeguards the converter during excessive load conditions.

Over-Voltage Protection (OVP): Protects the system from dangerously high output voltages.

Short-Circuit Protection (SCP): Automatically limits current in case of an output short.

Open-Loop Protection: Activates if the feedback loop is broken.

Over-Temperature Protection (OTP): Shuts down the IC if the junction temperature exceeds safe limits.

These protections are managed through an advanced fault management system that typically enters an automatic restart mode, allowing the power supply to recover automatically once the fault condition is removed.

The fixed-frequency operation, typically around 100 kHz, simplifies the design of EMI filters, which is crucial for passing electromagnetic compatibility (EMC) regulations. The device also employs frequency jittering, a technique that slightly modulates the switching frequency to spread the emitted noise spectrum, thereby reducing peak EMI and easing filter design.

ICGOODFIND: The Infineon ICE2BS01 is a highly integrated and robust SMPS controller IC that excels in low-power applications. By combining a current-mode controller, a high-voltage power switch, and extensive protection circuitry into a single package, it offers designers a compact, efficient, and reliable solution that simplifies the development of switch-mode power supplies for a wide range of consumer and industrial products.

Keywords:

1. SMPS Controller

2. Current-Mode Control

3. High Integration

4. Protection Features

5. Flyback Converter