Infineon Technologies ICE1QS01

Overview

ICE1QS01 from Infineon Technologies is a quasiresonant flyback controller IC for AC-DC power supplies supporting primary-side regulation, PFC charge-pump integration, and standby power <1 W. It operates with digital frequency reduction down to 20 kHz, features mains-dependent foldback correction, and drives external MOSFETs via a dedicated gate driver output. Used in TV sets, DVD players, and SAT receivers up to ~300 W.

For engineers reviewing the ICE1QS01 datasheet, ICE1QS01 pinout, ICE1QS01 application, or ICE1QS01 equivalent, key selection criteria include quasiresonant zero-voltage switching capability, primary current simulation (PCS) input for leading-edge spike immunity, burst-mode operation without control signal, VCC undervoltage lockout, and integrated ringing suppression timing controlled by output voltage.

Technical Context

The ICE1QS01 implements digital frequency stepping-reducing switching frequency in discrete steps as load decreases-to maintain efficiency across 0–300 W while eliminating jitter under pulsed loads. Its zero-crossing detection (RZI pin) triggers switching only at transformer demagnetization points, enabling true quasiresonant operation.

Primary regulation is achieved via internal error amplifier or optocoupler feedback, with PCS input providing voltage proportional to primary current (V_PCS = 1.5 V + I_primary × R₂C₂/L_primary). Mains voltage-dependent foldback point correction adjusts overcurrent threshold dynamically using rectified line sensing.

Key Specifications

Pinout & Package

P-DIP-8 package: 8-pin dual in-line plastic package with 0.3 inch body width, through-hole mounting, RoHS-compliant lead finish.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar quasiresonant flyback controller applications.

Compared with ICE2QS03G, the ICE1QS01 offers tighter cost control and proven field reliability in high-volume consumer SMPS, while UCC28600 trades PCS functionality for simpler analog control-making ICE1QS01 preferable where primary-side sensing and ultra-low standby are mandatory.

Availability

ICE1QS01 is available at Aetrix Electronics and suitable for TV power supplies, DVD player adapters, and SAT receiver PSUs requiring stable component supply, long-lifecycle support, and compliance with international energy-efficiency standards.

Supply support for ICE1QS01 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 ICE1QS01 belongs to Infineon's ICE1x family of AC-DC controllers, designed specifically for cost-sensitive, high-efficiency consumer power supplies requiring quasiresonant operation and sub-1 W standby.

FAQ

What is the purpose of the PCS pin on the ICE1QS01?

The PCS (Primary Current Simulation) pin accepts a voltage derived from an RC network across the primary winding, producing a signal proportional to primary current without sensing diode spikes. This enables accurate primary-side regulation while eliminating the need for secondary-side current transformers or sense resistors, reducing cost and board space.

Does the ICE1QS01 require an optocoupler for regulation?

No-the ICE1QS01 supports both optocoupler-based and primary-side regulation. Its internal error amplifier can regulate directly from the SRC pin using feedback from an auxiliary winding, enabling isolated output control without optocoupler in many applications, though optocoupler use improves cross-regulation in multi-output designs.

How does the ICE1QS01 achieve <1 W standby power?

It enters burst mode automatically when load drops below threshold, disabling switching cycles entirely except for periodic sampling. Combined with ultra-low start-up current (~60 µA) and internal reference shutdown during idle periods, this reduces total system input power to under 1 W without external control signals or auxiliary circuitry.

Can the ICE1QS01 be used in PFC+flyback two-stage topologies?

Yes-it supports PFC charge-pump integration, where the PFC stage is implemented using a passive charge-pump network driven by the same controller. It is not intended for active boost-PFC stages; for those, a dedicated PFC controller like ICE2PCS01 must be paired externally.