Infineon Technologies ICE2QR1765GXUMA1

Overview

ICE2QR1765GXUMA1 from Infineon is a quasi-resonant AC-DC controller IC integrating a 650 V avalanche-rugged CoolMOS™ transistor and digital PWM control in PG-DSO-12 package. It delivers 49 W at 230 VAC ±15%, supports active burst mode (<100 mW no-load standby), and enables digital frequency reduction for efficiency optimization in offline SMPS for consumer adapters and auxiliary supplies.

For engineers reviewing the ICE2QR1765GXUMA1 datasheet, ICE2QR1765GXUMA1 pinout, ICE2QR1765GXUMA1 application, or ICE2QR1765GXUMA1 equivalent, key selection criteria include its integrated 650 V CoolMOS™, ZC-based quasi-resonant switching, active burst mode threshold, digital soft-start timing (12 ms), and cycle-by-cycle current limiting with foldback correction.

Technical Context

The IC implements peak-current-mode quasi-resonant control using a zero-crossing (ZC) detector to trigger MOSFET turn-on after transformer demagnetization, reducing EMI and voltage stress on secondary diodes. Its digital up/down counter adjusts switching frequency dynamically based on feedback voltage (VFB), enabling load-dependent frequency reduction down to burst mode.

Built-in protections include auto-restart for VCC over/under-voltage, overload, and over-temperature, plus latch-off for adjustable output over-voltage and transformer short-winding detection. The integrated startup cell provides controlled pre-charging of VCC via high-voltage current source (1.05 mA typical) independent of input voltage.

Key Specifications

Pinout & Package

Package: PG-DSO-12 (12-pin exposed-pad SOIC variant with thermal 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 ICE2QR0665G and ICE3BR0665J, ICE2QR1765GXUMA1 provides highest power density (49 W) and lowest system component count due to integrated startup cell and lower R_DS(on), making it optimal for space-constrained, high-efficiency adapter designs.

Availability

ICE2QR1765GXUMA1 is available at Aetrix Electronics and suitable for adapter/charger, set-top box, Blu-ray/DVD player, and auxiliary power supply applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant manufacturing.

Supply support for ICE2QR1765GXUMA1 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 and wide-bandgap power devices.

The CoolSET™-Q1 product line integrates high-voltage power transistors and digital control logic specifically for cost-sensitive, high-efficiency offline SMPS in consumer electronics and auxiliary power systems.

FAQ

What is the function of the ZC pin in ICE2QR1765GXUMA1?

The ZC (Zero-Crossing) pin receives a delayed signal from the transformer auxiliary winding and serves two critical roles: triggering MOSFET turn-on after demagnetization to enable quasi-resonant zero-voltage switching, and detecting output over-voltage by comparing V_ZC against an internal threshold. This dual functionality eliminates need for separate ZCD and OVP circuits.

How does the active burst mode reduce standby power below 100 mW?

Active burst mode disables switching cycles entirely during no-load conditions, allowing only periodic short bursts to maintain regulation. The IC monitors FB voltage to determine burst duration and interval, while internal digital control ensures minimal energy draw from VCC and tightly constrains output voltage ripple-achieving <100 mW without external bias winding regulation.

Can ICE2QR1765GXUMA1 operate without an auxiliary winding?

No. The auxiliary winding powers the VCC pin after startup and sustains IC operation under load. Although the integrated startup cell pre-charges VCC initially, sustained operation requires energy from the auxiliary winding. Omitting it causes VCC undervoltage lockout and automatic shutdown after soft-start completes.

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

The PG-DSO-12 uses an exposed thermal pad that must be soldered to a dedicated copper pour on the PCB for effective heat dissipation. With R_DS(on) = 1.70 Ω and 49 W output capability, junction-to-board thermal resistance depends heavily on pad area and via count; Infineon recommends ≥4 thermal vias under the pad and ≥250 mm² copper area for reliable operation at Ta = 50°C.