Infineon Technologies ICE2AS01GHUMA1

Overview

ICE2AS01GHUMA1 from Infineon Technologies is a fixed-frequency, current-mode PWM controller IC for off-line SMPS applications, featuring 100 kHz switching frequency, ±5% peak current limiting tolerance, soft-start with auto-restart protection, and 8.5–21 V VCC operating range. It enables low-standby-power designs compliant with Blue Angel requirements in AC/DC adapters and auxiliary power supplies.

For engineers reviewing the ICE2AS01GHUMA1 datasheet, ICE2AS01GHUMA1 pinout, ICE2AS01GHUMA1 application, or ICE2AS01GHUMA1 equivalent, key selection criteria include its integrated leading-edge blanking, frequency reduction to 21.5 kHz in standby mode, latched thermal shutdown, adjustable current limit via external Rsense, and PG-DSO-8 RoHS-compliant package.

Technical Context

This controller implements an enhanced current-mode architecture where duty cycle is determined by comparing the amplified sense voltage (gain = 3.65) against feedback voltage (FB), with propagation delay compensation and internal 200 ns leading-edge blanking to suppress switching noise. The oscillator supports normal operation at 100 kHz and automatic reduction to 21.5 kHz during light-load standby.

Power management includes undervoltage lockout (13.5 V turn-on / 8.5 V turn-off hysteresis), internal 6.5 V bandgap reference, and soft-start controlled by external capacitor on SoftS pin. Protection functions-overload, open-loop, overvoltage, and thermal shutdown (>140 °C)-trigger auto-restart mode with controlled recovery timing.

Key Specifications

Pinout & Package

ICE2AS01GHUMA1 is housed in a PG-DSO-8 (RoHS-compliant, lead-free plating) surface-mount package with exposed pad for thermal enhancement.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ICE2BS01GHUMA1, ICE2AS01GHUMA1 delivers tighter regulation at light loads due to higher 100 kHz base frequency and optimized voltage-ramp assist; versus UC3842BD1G, it integrates critical protection and soft-start functions that reduce component count and improve reliability in modern low-standby designs.

Availability

ICE2AS01GHUMA1 is available at Aetrix Electronics and suitable for AC/DC wall adapters, set-top box auxiliary supplies, and industrial control module PSUs requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for ICE2AS01GHUMA1 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 manufacturing and quality certifications including CECC approval.

ICE2AS01GHUMA1 belongs to the CoolSET™ family of integrated SMPS controllers designed specifically for energy-efficient, low-standby-power offline power supplies meeting international eco-label standards.

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 external soft-start capacitor to control gate drive ramp-up at power-on, and acts as the auto-restart control node during fault conditions. During startup, a capacitor between SoftS and GND sets the soft-start duration; during overload or open-loop events, the internal protection unit discharges this capacitor to initiate controlled restart cycles. No pull-up or pull-down resistors are required-design relies solely on capacitor value.

Does ICE2AS01GHUMA1 support direct connection to an optocoupler without additional bias components?

Yes-the FB pin includes an internal 10 kΩ pull-up resistor to 6.5 V, enabling direct connection to the cathode of a standard PC817-type optocoupler. The phototransistor collector connects to VCC through a current-limiting resistor, and emitter ties to FB. This configuration forms a complete secondary-side regulation loop without external biasing networks or level-shifting circuitry.

How does the current-sense architecture handle switching noise on the Isense pin?

The IC incorporates 200 ns internal leading-edge blanking synchronized to each gate pulse, suppressing false triggering from MOSFET drain-source voltage spikes during turn-on. Combined with propagation delay compensation and a 3.65× gain stage optimized for low-voltage sensing, this eliminates the need for external RC filters or Schottky clamps-reducing component count and improving noise immunity across temperature and line conditions.

Can ICE2AS01GHUMA1 operate safely with input voltages exceeding 270 VAC?

No-the device is rated for universal AC input up to 270 VAC (≈380 VDC peak). Operation beyond this violates absolute maximum ratings for internal structures and may cause premature failure of the VCC clamp or gate driver. For 305 VAC or 400 VDC applications, Infineon recommends ICE2QS03G or other high-voltage variants with extended input rating and reinforced isolation design.