Infineon Technologies ICE5QR4780AZXKLA1

Overview

ICE5QR4780AZXKLA1 from Infineon is a quasi-resonant 800 V CoolSET™ integrated power IC combining a digital QR controller and avalanche-rugged CoolMOS™ in a single PG-DIP-7 package. It delivers up to 28 W at 220 VAC ±20%, supports <100 mW standby power via selectable Active Burst Mode, and features digital frequency reduction up to 10 zero crossings for EMI suppression - used in auxiliary power supplies for TVs and set-top boxes.

For engineers reviewing the ICE5QR4780AZXKLA1 datasheet, ICE5QR4780AZXKLA1 pinout, ICE5QR4780AZXKLA1 application, or ICE5QR4780AZXKLA1 equivalent, key selection criteria include its 800 V drain rating, 4.13 Ω R_DS(on), cascode fast-start architecture, robust line OVP/brownout protection, and DIP-7 thermal performance in open-frame AC/DC flyback designs.

Technical Context

This device implements a digitally controlled quasi-resonant flyback controller with integrated 800 V CoolMOS™, using zero-crossing (ZC) detection to gate-turn-on at valley points for reduced switching loss. Its proprietary digital frequency reduction adjusts switching frequency based on load and input voltage, maintaining low EMI across line variations.

The cascode configuration enables fast startup by pre-charging VCC through ZCD, while built-in soft-start and ringing suppression time control prevent audible noise during transient events. Protection logic includes auto-restart for VCC OVP/UVP, output OVP, overtemperature, CS short-to-GND, and line brownout/OVP - all implemented with dedicated analog comparators and digital counters.

Key Specifications

Pinout & Package

ICE5QR4780AZXKLA1 is housed in PG-DIP-7 (7-pin dual in-line plastic) package with creepage/clearance optimized for reinforced insulation in AC/DC auxiliary supplies.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ICE5QR4780AZXKLA1, ICE5QR4770AZ trades off 100 V breakdown margin and 1 W output for lower conduction loss at lighter loads, while ICE5QR2280AZ doubles output capability at the cost of higher die size and thermal footprint - enabling scalable design across 15–41 W auxiliary power tiers.

Availability

ICE5QR4780AZXKLA1 is available at Aetrix Electronics and suitable for TV auxiliary power supplies, set-top box power systems, and home appliance control boards requiring stable component supply, long-term lifecycle support, and RoHS-compliant manufacturing.

Supply support for ICE5QR4780AZXKLA1 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 is a German semiconductor manufacturer specializing in power management, automotive, and industrial control ICs, with leadership in silicon carbide and CoolMOS™ technologies.

This part belongs to the ICE5QRxxxxAx CoolSET™ family - designed specifically for high-efficiency, low-EMI quasi-resonant flyback converters in consumer and industrial auxiliary power applications.

FAQ

What is the maximum continuous output power supported by ICE5QR4780AZXKLA1?

At 220 VAC ±20% and Ta = 50°C on a 2 oz copper single-sided PCB, ICE5QR4780AZXKLA1 supports up to 28 W continuous output power. This rating assumes minimum drain pin copper area and open-frame design; actual power depends on heatsinking, transformer design, and ambient conditions.

How does the Active Burst Mode achieve sub-100 mW standby power?

Active Burst Mode uses feedback voltage threshold detection to disable switching cycles selectively while maintaining regulation. The enhanced implementation allows configurable entry/exit power levels and combines with digital frequency reduction to minimize both switching and conduction losses during no-load conditions.

Can ICE5QR4780AZXKLA1 operate without an auxiliary winding?

Yes - its cascode startup architecture uses the ZCD pin to pre-charge the VCC capacitor directly from the primary winding during initial demagnetization, eliminating dependency on an auxiliary winding and simplifying transformer design for space-constrained applications.

Which protection functions trigger auto-restart versus latched shutdown?

All protections - including VCC OVP/UVP, output OVP, overtemperature, CS short-to-GND, line OVP, and brownout - initiate auto-restart mode. After fault detection, the IC disables switching, waits a fixed timeout, then attempts recovery. No manual reset or power cycle is required for any protected condition.