Infineon Technologies ICE2QR0665XKLA1

Overview

ICE2QR0665XKLA1 from Infineon Technologies is a quasi-resonant PWM controller IC with integrated 650V CoolMOS® and startup cell in PG-DIP-8 package, designed for off-line SMPS in LCD monitors and DVD players. It delivers 50W output at 85–265 VAC input, features Active Burst Mode (<0.1W no-load standby), digital frequency reduction, and built-in foldback current limiting.

For engineers reviewing the ICE2QR0665XKLA1 datasheet, ICE2QR0665XKLA1 pinout, ICE2QR0665XKLA1 application, or ICE2QR0665XKLA1 equivalent, this page provides verified functional identity, validated DIP-8 pin mapping, confirmed quasi-resonant timing behavior, and real-world power-stage integration requirements for AC/DC flyback designs.

Technical Context

The ICE2QR0665XKLA1 implements peak-current-mode control with zero-crossing detection to enable valley-switching of its internal 650V CoolMOS®, reducing EMI and voltage stress on secondary rectifiers. Its digital up/down counter adjusts switching frequency dynamically based on feedback voltage (VFB), enabling quasi-resonant operation down to very low load.

It integrates a high-voltage startup cell that pre-charges VCC via the main drain node, eliminating external start-up resistors. Protection includes auto-restart for overtemperature, overload, and VCC over/under-voltage, plus latch-off for adjustable output overvoltage and transformer short-winding detection.

Key Specifications

Pinout & Package

Package: PG-DIP-8 (Plastic Dual In-line Package, 8-pin, 0.3 inch width, creepage ≥5.0 mm). Pins 4 and 5 are internally shorted as common Drain connection.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar quasi-resonant SMPS controller applications.

Compared with ICE2QR4765Z and LD7575PS, ICE2QR0665XKLA1 uniquely combines 650V integration, 50W capability, and validated Active Burst Mode - making it optimal for cost-sensitive, space-constrained 30–50W universal-input flyback systems where BOM count and layout simplicity are critical.

Availability

ICE2QR0665XKLA1 is available at Aetrix Electronics and suitable for LCD monitor power supplies, DVD player SMPS, and set-top box adapters requiring stable component supply, long-lifecycle support, and qualified industrial-grade sourcing.

Supply support for ICE2QR0665XKLA1 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 certification to ISO 9001 and IATF 16949.

The CoolSET®-Q1 product line was developed specifically for cost-optimized, high-efficiency off-line flyback converters in consumer electronics, integrating HV switching, control logic, and protection in single-package solutions.

FAQ

What is the maximum continuous output power achievable with ICE2QR0665XKLA1?

The ICE2QR0665XKLA1 is rated for 50W maximum output power at 50°C ambient temperature without heatsink copper area, per Infineon's datasheet Version 2.5. This assumes proper PCB layout with ≥4 cm² of 2-oz copper connected to Drain pins 4/5, and operation within 85–265 VAC input range. Derating applies above 50°C ambient or with reduced copper area.

Does ICE2QR0665XKLA1 require an external startup resistor?

No. The ICE2QR0665XKLA1 integrates a high-voltage startup cell within its CoolMOS® structure, which pre-charges the VCC capacitor directly from the Drain node. This eliminates the need for an external high-voltage start-up resistor, reducing BOM count and improving reliability in high-input-voltage applications.

How does the Active Burst Mode reduce no-load power consumption?

Active Burst Mode disables complete switching cycles while maintaining feedback loop monitoring. When output load drops below ~5%, the controller enters burst mode: it activates switching only in short trains until output voltage droops, then pauses until regulation error triggers next train. This achieves <0.1W input power by minimizing both switching and quiescent losses simultaneously.

Can ICE2QR0665XKLA1 be used in continuous conduction mode (CCM) flyback designs?

Yes - though optimized for discontinuous conduction mode (DCM) and quasi-resonant operation, the ICE2QR0665XKLA1 supports CCM via its current-mode architecture and programmable peak current limit. However, zero-crossing detection remains active, so valley switching occurs only when demagnetization completes; CCM operation requires careful transformer design to avoid ZC mis-triggering during incomplete reset.