Infineon Technologies ICE2QR4780GXUMA2

Overview

ICE2QR4780GXUMA2 from Infineon Technologies is a quasi-resonant AC-DC controller IC integrating an 800 V avalanche-rugged CoolMOS™ transistor, digital frequency reduction, active burst mode, and built-in startup cell in a PG-DSO-12 package. It delivers up to 37 W at 230 VAC ±15% and 22 W across universal input (85–265 VAC), targeting compact offline SMPS in consumer adapters and auxiliary supplies.

For engineers reviewing the ICE2QR4780GXUMA2 datasheet, ICE2QR4780GXUMA2 pinout, ICE2QR4780GXUMA2 application, or ICE2QR4780GXUMA2 equivalent, this device offers verified zero-crossing detection, cycle-by-cycle current limiting, foldback point correction, digital soft-start (12 ms), and auto-restart protections for VCC OVP/UVP, overload, and overtemperature - critical for reliable low-standby-power designs.

Technical Context

The IC implements peak-current-mode quasi-resonant control with digital zero-crossing detection and an up/down counter that adjusts switching frequency based on feedback voltage (VFB) in 48 ms intervals. It uses a time-delayed auxiliary winding signal at the ZC pin to determine optimal MOSFET turn-on timing after transformer demagnetization.

Digital frequency reduction lowers switching loss under light load by dynamically scaling off-time; active burst mode reduces standby power to <100 mW via controlled pulse trains. Protection logic includes cycle-by-cycle current limiting, maximum on/off time clamping, and latch-off for adjustable output overvoltage and transformer short-winding detection.

Key Specifications

Pinout & Package

Package: PG-DSO-12 (12-pin, exposed drain pad, RoHS-compliant, halogen-free mold compound).

Key Features

Applications

Equivalent & Alternatives

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

Compared with ICE2QR4780GXUMA2, the ICE2QR4765GXUMA2 trades 800 V ruggedness and 37 W capability for lower R_DS(on) cost, while LD7575G increases component count and layout complexity but offers greater topology flexibility and repairability.

Availability

ICE2QR4780GXUMA2 is available at Aetrix Electronics and suitable for adapter/charger, set-top box, Blu-ray/DVD player, and server auxiliary power supply designs requiring stable component supply, long-term lifecycle support, and RoHS-compliant manufacturing.

Supply support for ICE2QR4780GXUMA2 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.

The CoolSET™-Q1 product line integrates high-voltage power switches with digital quasi-resonant controllers specifically for cost-sensitive, low-standby-power offline SMPS in consumer and computing auxiliary applications.

FAQ

What is the purpose of the ZC pin and how is it used in quasi-resonant operation?

The ZC pin receives a time-delayed signal from the transformer auxiliary winding to detect demagnetization completion. Internally, it feeds a zero-crossing detector that determines optimal MOSFET turn-on timing-minimizing switching loss and voltage stress. It also serves as the input for output overvoltage protection by comparing V_ZC against an internal threshold.

How does Active Burst Mode achieve <100 mW standby power?

Active Burst Mode disables switching cycles in controlled bursts while maintaining regulation via feedback monitoring. The IC enters this mode when load drops below a VFB threshold, then activates short PWM trains only when output voltage droops beyond tolerance. This eliminates continuous switching loss and reduces average input current to sub-mA levels.

Can ICE2QR4780GXUMA2 operate without an optocoupler?

No - the FB pin requires feedback from a TL431-based optocoupler circuit to regulate output voltage. While the IC integrates primary-side sensing and control logic, secondary-side voltage sensing and isolation are mandatory for tight regulation and safety compliance in offline SMPS topologies.

What thermal design considerations apply to the PG-DSO-12 package?

The four Drain pins (5–8) are electrically and thermally tied to the CoolMOS™ die and must be connected to ≥232 mm² of 2 oz copper on the PCB to achieve rated 37 W output at 50°C ambient. Thermal vias under the exposed pad and proper copper fill around Drain pins are essential to maintain junction temperature ≤125°C under full load.