Infineon Technologies ICE3BS02L

Overview

ICE3BS02L from Infineon Technologies is an off-line SMPS current-mode PWM controller with integrated 500V startup cell, latched-off protection, and active burst mode for <100mW standby power. It operates at a fixed 67kHz switching frequency, supports up to 72% duty cycle, and delivers precise peak current limiting (<±5% tolerance) for universal AC input (85–270VAC) flyback converters in low-power AC/DC adapters.

For engineers reviewing the ICE3BS02L datasheet, ICE3BS02L pinout, ICE3BS02L application, or ICE3BS02L equivalent, key selection criteria include its latched-off response to overtemperature/overvoltage/short-winding faults, adjustable blanking window for load-jump immunity, and internal soft-start with auto-restart capability - all critical for reliable, low-standby consumer power supplies.

Technical Context

The ICE3BS02L implements current-mode control with leading-edge blanking (220ns), propagation-delay compensation, and a dedicated control unit managing active burst mode via FB signal feedback. Its oscillator fixes f_SW at 67kHz, while the PWM latch (FF1) and gate driver deliver precise timing and 0.72 max duty cycle enforcement.

Protection logic includes dual-tier fault handling: latched-off mode (non-self-recovering, requires AC disconnect) for catastrophic events (T_j >140°C, V_VCC <6V, CS overthreshold), and auto-restart mode (self-resetting) for overload, open-loop, or V_VCC undervoltage (8.5V cutoff).

Key Specifications

Pinout & Package

ICE3BS02L is housed in PG-DIP-8-6 package (8-pin plastic dual in-line, 6.35mm pitch, pins 4 and 5 internally shorted). This through-hole package supports high-voltage isolation and robust thermal performance in cost-sensitive offline SMPS designs.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar off-line current-mode controller applications.

Compared with ICE3B03L and UC3842BD1R2G, the ICE3BS02L uniquely integrates 500V startup, latched-off fault response, and sub-100mW active burst mode - making it the sole choice for Energy Star-compliant consumer adapters requiring zero-maintenance safety shutdown and minimal external components.

Availability

ICE3BS02L is available at Aetrix Electronics and suitable for USB wall adapters, set-top box standby supplies, and smart home hub power systems requiring stable component supply, long-term lifecycle support, and RoHS-compliant manufacturing.

Supply support for ICE3BS02L includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Infineon Technologies AG is a German semiconductor manufacturer specializing in power management, automotive, and industrial control ICs, with global R&D and manufacturing infrastructure.

The ICE3x family targets cost-optimized, high-reliability offline SMPS controllers for consumer electronics, emphasizing integrated protection, ultra-low standby power, and simplified board-level design.

FAQ

What is the purpose of the dual HV pins (pins 4 and 5) on ICE3BS02L?

Pins 4 and 5 are internally shorted within the PG-DIP-8-6 package to distribute high-voltage current and improve thermal dissipation from the integrated 500V startup cell. This dual-pin configuration reduces current density at the HV interface and enhances reliability under sustained 270VAC input conditions without requiring external derating.

How does the adjustable blanking window on SoftS pin improve system robustness?

The external capacitor on SoftS sets both soft-start duration and blanking window length. During high di/dt load steps, this window disables current-limit detection for a user-defined period (e.g., 1–10µs), preventing false triggering of auto-restart mode caused by transient current spikes - ensuring uninterrupted operation during real-world load transients.

Can ICE3BS02L be used in continuous conduction mode (CCM) flyback designs?

No - ICE3BS02L is optimized for discontinuous conduction mode (DCM) and transition mode (TM) operation. Its 67kHz fixed frequency, 72% max duty cycle, and current-sense architecture assume DCM waveforms; CCM use would cause instability due to right-half-plane zero effects and insufficient current-sense bandwidth.

What happens during latched-off mode, and how is it reset?

When latched-off mode activates (e.g., due to overtemperature >140°C or V_VCC <6V), the Gate output is forced low and all internal circuitry halts. Recovery requires complete removal of AC input voltage to discharge HV and VCC capacitors - no software or signal-based reset is possible, ensuring fail-safe behavior in hazardous fault conditions.