Infineon Technologies ICE2AS01

Overview

ICE2AS01 from Infineon Technologies is a fixed-frequency, current-mode PWM controller IC for off-line SMPS applications, featuring 100 kHz switching frequency, integrated soft-start, precise ±5% peak current limiting, and auto-restart protection. It operates from 85–270 VAC input via auxiliary winding-derived VCC, delivers gate drive for external MOSFETs, and supports low-standby-power "Blue Angel" compliance in standby mode with frequency reduction to 21.5 kHz.

For engineers reviewing the ICE2AS01 datasheet, ICE2AS01 pinout, ICE2AS01 application, or ICE2AS01 equivalent, this controller is selected for cost-sensitive, low-power AC/DC adapters, auxiliary supplies, and open-frame SMPS where accurate current sensing, thermal shutdown, undervoltage lockout, and EMI-optimized soft gate driving are critical design requirements.

Technical Context

The ICE2AS01 implements an improved current-mode control architecture with propagation delay compensation and internal leading-edge blanking (200 ns), enabling stable regulation across line and load variations. Its PWM comparator compares amplified sense voltage (gain = 3.65) against optocoupler-derived FB voltage, while the standby unit reduces oscillator frequency to 21.5 kHz under light load to minimize audible noise and standby dissipation.

Protection is managed by a dedicated unit triggering auto-restart on overload, open-loop, or overvoltage faults - not latch-off - with latched thermal shutdown at T_j > 140 °C. The driver output features soft gate driving for reduced EMI, and VCC supervision includes UVLO (13.5 V turn-on / 8.5 V turn-off) with hysteresis and overvoltage disable at 16.5 V during startup.

Key Specifications

Pinout & Package

ICE2AS01 is housed in an 8-pin PG-DIP-8 (plastic dual in-line package) with 2.54 mm pitch, RoHS-compliant lead finish, and creepage/clearance suited for reinforced insulation in Class II AC/DC converters.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ICE2BS01 and UC3842BD1G, the ICE2AS01 uniquely combines 100 kHz operation, ±5% current limit accuracy, and automatic standby frequency reduction - making it optimal for compact, low-noise, energy-certified AC/DC supplies where component count and regulatory compliance are prioritized.

Availability

ICE2AS01 is available at Aetrix Electronics and suitable for AC/DC adapter power supplies, set-top box auxiliary supplies, and open-frame industrial SMPS requiring stable component supply, long-term lifecycle support, and RoHS-compliant manufacturing.

Supply support for ICE2AS01 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 ICE2x01 family targets cost-effective, high-reliability off-line SMPS controllers - designed specifically for low-power standby applications demanding precision current sensing, integrated protection, and energy certification readiness.

FAQ

What is the purpose of the SoftS pin, and how is it used in circuit design?

The SoftS pin serves dual functions: it hosts the soft-start timing capacitor during power-up and controls auto-restart behavior after fault conditions. During startup, an external capacitor ramps voltage from 0 V to initiate gradual duty-cycle increase. After a fault-triggered auto-restart, SoftS voltage determines restart timing - its discharge path is internally managed to ensure consistent recovery intervals without external components.

Does ICE2AS01 support primary-side regulation without an optocoupler?

No - ICE2AS01 requires optocoupler-based feedback via the FB pin for closed-loop regulation. The FB input compares against an internal 4.0 V threshold and feeds both the PWM comparator and protection unit; no internal voltage reference or shunt regulator is provided for direct primary-side sensing, and the datasheet specifies optocoupler or transistor-based feedback only.

How does the ICE2AS01 achieve ±5% current limit accuracy despite external R_Sense tolerance?

The ±5% overall current limit tolerance includes contributions from internal gain (3.65×), comparator threshold (0.8 V), and propagation delay compensation - all factory-trimmed. While external R_Sense tolerance adds error, the specification reflects worst-case combined variation across temperature and process; typical designs use 1% R_Sense to meet the ±5% system-level limit under full operating conditions.

Can ICE2AS01 be used with CoolMOS™ transistors, and what layout considerations apply?

Yes - ICE2AS01's Gate output is rated for standard MOSFET gate drive and fully compatible with Infineon CoolMOS™ devices. Layout best practices include minimizing trace inductance between Gate and MOSFET, placing Isense resistor close to source pin with Kelvin connections, and separating power and signal grounds at single-point GND to avoid noise coupling into FB or Isense paths.