Infineon Technologies ICE3A0365FKLA1

Overview

ICE3A0365FKLA1 from Infineon Technologies is a current-mode off-line SMPS controller integrating a 650V depletion CoolMOS™ power transistor and startup cell in a single PG-DIP-8 package. It delivers 22W continuous input power at 230VAC ±15%, operates at fixed 100kHz switching frequency, achieves <100mW standby power via Active Burst Mode, and targets AC/DC adapters and auxiliary power supplies for consumer electronics.

For engineers reviewing the ICE3A0365FKLA1 datasheet, ICE3A0365FKLA1 pinout, ICE3A0365FKLA1 application, or ICE3A0365FKLA1 equivalent, this device is selected for low-standby, high-reliability flyback converters requiring integrated high-voltage switching, precise peak current limiting (<±5%), and robust auto-restart protection under overload, overvoltage, overtemperature, and VCC undervoltage conditions.

Technical Context

The ICE3A0365FKLA1 implements a fixed-frequency (100kHz) current-mode PWM control architecture with internal oscillator, leading-edge blanking, and propagation delay compensation to ensure stable operation during fast load transients. Its integrated 650V CoolMOS™ enables direct connection to universal AC input (85–265VAC) without external HV startup resistor.

Active Burst Mode dynamically modulates switching pulses at light load to suppress output ripple (<1%) while maintaining immediate response to load jumps-eliminating blackouts common in traditional burst-mode controllers. Protection logic triggers Auto Restart Mode on VCC UVLO, overtemperature, open-loop, or overvoltage faults.

Key Specifications

Pinout & Package

ICE3A0365FKLA1 uses the PG-DIP-8 package (8-pin dual in-line plastic), with pins 4 and 5 internally shorted as common Drain terminals. The package provides reinforced creepage distance suitable for Class II isolation and meets RoHS requirements with Pb-free lead plating.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar off-line flyback controller applications.

Compared with ICE3B0365FKLA1, the ICE3A0365FKLA1 offers higher switching frequency for smaller transformers but requires more careful EMI filtering; versus ICE3A0565FKLA1, it trades 3W input power headroom for lower R_DS(on)-related cost and thermal simplicity in 20–22W applications.

Availability

ICE3A0365FKLA1 is available at Aetrix Electronics and suitable for USB-C wall adapters, smart TV auxiliary supplies, IoT gateway power supplies, and LED driver auxiliary circuits requiring stable component supply, long-term lifecycle support, and RoHS-compliant manufacturing.

Supply support for ICE3A0365FKLA1 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 R&D and manufacturing infrastructure.

The CoolSET™-F3 product line delivers integrated HV SMPS controllers targeting cost-sensitive, high-efficiency offline power supplies-designed specifically for universal-input flyback converters in consumer and industrial auxiliary power applications.

FAQ

What is the purpose of the n.c. pin (Pin 6) in the PG-DIP-8 package?

Pin 6 is explicitly designated as "Not Connected" in the datasheet and must remain unconnected on the PCB. Internally, it is electrically isolated from all circuitry. Connecting it risks disrupting internal bias networks or causing undefined behavior during startup or fault conditions, potentially leading to erratic switching or failure to enter Active Burst Mode.

How does the integrated 650V startup cell eliminate the need for an external HV resistor?

The startup cell uses a depletion-mode CoolMOS™ transistor that conducts current from the rectified AC line directly into the V_CC capacitor during initial power-up. Once V_CC reaches its turn-on threshold (~12.5V), the controller activates and the auxiliary winding takes over supply-rendering the external HV resistor obsolete and improving startup reliability across wide input voltage ranges.

Can ICE3A0365FKLA1 be used in continuous conduction mode (CCM) flyback designs?

No-ICE3A0365FKLA1 is optimized for discontinuous conduction mode (DCM) and quasi-resonant (QR) operation. Its 72% max duty cycle, fixed 100kHz oscillator, and current-sense architecture lack CCM-specific features like slope compensation or variable frequency control. Using it in CCM risks instability, inaccurate current limiting, and premature overcurrent shutdown.

What is the role of the adjustable blanking window, and how is it configured?

The blanking window disables current-sense comparison for a user-defined duration after each PWM pulse starts, preventing false OCP triggering from parasitic ringing at the CS pin. It is configured using an external RC network between SoftS and GND: a 100kΩ resistor and 100pF capacitor yields ~100ns blanking, scalable per application noise profile and transformer layout.