Infineon Technologies ICE2QR1765ZXKLA1

Overview

ICE2QR1765ZXKLA1 from Infineon Technologies is a quasi-resonant AC-DC PWM controller IC with integrated 650V avalanche-rugged CoolMOS® and startup cell in PG-DIP-7 package. It delivers 54.8W max input power at 230VAC ±15%, supports active burst mode (<100mW no-load standby), and enables digital frequency reduction for efficiency optimization in off-line SMPS for LCD monitors and Blu-ray DVD players.

For engineers reviewing the ICE2QR1765ZXKLA1 datasheet, ICE2QR1765ZXKLA1 pinout, ICE2QR1765ZXKLA1 application, or ICE2QR1765ZXKLA1 equivalent, key selection criteria include integrated high-voltage MOSFET rating (650V), quasi-resonant zero-crossing detection capability, active burst mode control logic, digital soft-start timing (12ms), and VCC pre-charge startup cell behavior under universal AC input (85–265VAC).

Technical Context

The ICE2QR1765ZXKLA1 implements peak-current-mode quasi-resonant control using a digital up/down counter synchronized to transformer demagnetization via ZC pin input. Its internal zero-crossing detector triggers switch-on only at valley points, reducing EMI and voltage stress on secondary rectifiers.

It integrates a BiCMOS-based controller with digital frequency reduction logic that scales switching frequency downward as load decreases, plus an analog current-sense comparator with cycle-by-cycle peak limitation and foldback correction - all operating within a 7–25V VCC supply range.

Key Specifications

Pinout & Package

ICE2QR1765ZXKLA1 uses the PG-DIP-7 (Plastic Dual-In-Line Package, 7-pin) with standard 0.3-inch body width and 2.54mm pitch. The package features creepage/clearance optimized for reinforced insulation in AC-DC applications.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ICE2QR4765Z and ICE3B0565J, ICE2QR1765ZXKLA1 uniquely combines 650V integration, quasi-resonant valley switching, and sub-100mW standby in one DIP-7 package - making it optimal for energy-compliant 40–60W consumer power supplies where efficiency, EMI, and component count are co-prioritized.

Availability

ICE2QR1765ZXKLA1 is available at Aetrix Electronics and suitable for LCD monitor power supplies, Blu-ray player SMPS, and set-top box adapters requiring stable component supply, long-term lifecycle support, and RoHS-compliant manufacturing.

Supply support for ICE2QR1765ZXKLA1 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 electronics, and industrial control ICs, with global R&D and manufacturing infrastructure.

This part belongs to the CoolSET®-Q1 product line - engineered specifically for high-efficiency, low-standby-power quasi-resonant flyback converters in consumer electronics power supplies.

FAQ

What is the purpose of the N.C. pin (Pin 4) on ICE2QR1765ZXKLA1?

Pin 4 is internally unconnected and must remain electrically floating - no external connection, pull-up, or pull-down is permitted. This pin exists for mechanical symmetry and package compatibility within the PG-DIP-7 footprint; routing or loading it may compromise isolation integrity or cause unpredictable behavior.

How does the integrated startup cell function during initial power-up?

The startup cell uses a high-voltage device inside the CoolMOS® die to pre-charge the VCC capacitor from the rectified bulk voltage. It delivers ~1.05mA constant current after initial linear charging, bringing VCC to the turn-on threshold (typically ~12.5V) before enabling soft-start - eliminating external HV resistors and associated power loss.

Can ICE2QR1765ZXKLA1 operate without an auxiliary winding?

No - the ZC pin requires a properly phased and scaled auxiliary winding signal to detect transformer demagnetization for valley switching. Without it, quasi-resonant operation fails, defaulting to fixed-frequency mode with degraded efficiency and increased EMI; the IC will not regulate correctly or enter Active Burst Mode.

What protection mechanisms trigger latch-off versus auto-restart behavior?

Latch-off occurs only for adjustable output overvoltage (via FB pin monitoring) and transformer short-winding detection (via CS pin during on-time). All other protections - VCC OVP/UVP, overload, and overtemperature - use auto-restart with fixed delay intervals to recover automatically after fault removal.