Infineon Technologies ICE2B765I

Overview

ICE2B765I from Infineon Technologies is an off-line SMPS current mode controller with integrated 650V CoolMOS™, designed for high-efficiency AC/DC flyback converters in open-frame power supplies. It delivers 240W maximum practical continuous power at Ta=75°C, operates at 67kHz fixed switching frequency, features adjustable peak current limiting via external resistor, and supports low-power standby mode compliant with European Commission requirements.

For engineers reviewing the ICE2B765I datasheet, ICE2B765I pinout, ICE2B765I application, or ICE2B765I equivalent, key selection considerations include its TO-220-6 package thermal performance (R_thCA = 2.7K/W), isolated drain configuration, ±5% overall current limiting tolerance, and Auto Restart Mode behavior under overload/open-loop faults.

Technical Context

The ICE2B765I integrates a 650V avalanche-rugged CoolMOS™ transistor with a current-mode PWM controller featuring leading-edge blanking, propagation delay compensation, and precise peak current sensing via the Isense pin. Its oscillator supports fixed 67kHz operation with frequency reduction to 20–21.5kHz in standby to suppress audible noise.

Protection is implemented through a dedicated unit enabling Auto Restart Mode during overvoltage (no-load open loop), overload (short-circuit), or thermal shutdown events. The SoftS pin serves dual function-initiating soft-start at power-up and controlling Auto Restart timing after fault clearance-while VCC operates from 8.5V to 21V with overvoltage disable at >16.5V during startup.

Key Specifications

Pinout & Package

ICE2B765I uses the PG-TO220-6-46 package with isolated drain terminals and copper tab for direct heatsinking. The package provides increased creepage distance and eliminates need for insulating垫片 in primary-side mounting.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ICE2A765I, ICE2B765I reduces EMI and audible noise via 67kHz operation but increases transformer size; versus ICE2B765P2, it shares identical performance but differs only in mechanical footprint-making -46 the default choice for new designs requiring TO-220 compatibility.

Availability

ICE2B765I is available at Aetrix Electronics and suitable for industrial AC/DC power supplies, open-frame LED drivers, and white goods auxiliary power systems requiring stable component supply, long lifecycle support, and consistent parametric performance across production batches.

Supply support for ICE2B765I 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™-F2 product line targets high-efficiency, low-standby-power offline SMPS designs-specifically engineered for cost-sensitive, thermally constrained flyback converters up to 250W.

FAQ

What is the maximum continuous output power achievable with ICE2B765I in an open-frame design?

The ICE2B765I delivers 240W maximum practical continuous power and 130W at Ta = 75°C with R_thCA = 2.7 K/W, as specified in the datasheet's "Maximum power rating" table. This assumes optimized PCB copper area, forced-air cooling, and proper heatsink mounting to the isolated drain tab. Derating applies above 75°C ambient.

How does the SoftS pin function during fault recovery?

The SoftS pin controls Auto Restart timing after fault detection: an external capacitor discharges slowly post-fault, delaying restart until voltage falls below threshold. This creates a fixed retry interval-typically ~1 s per 100 nF-preventing rapid cycling during persistent overvoltage or short-circuit conditions.

Can ICE2B765I operate without an external heatsink?

Yes-ICE2B765I achieves 130W continuous output at Ta = 75°C without an external heatsink when mounted on a PCB with ≥6 cm² copper area and using the isolated drain tab for thermal conduction. For 240W operation, a heatsink is required to maintain T_j ≤ 125°C under full load and worst-case ambient.

What protection functions trigger Auto Restart Mode versus latch-off?

Auto Restart Mode activates for overload (short-circuit), open-loop (no-load overvoltage), and thermal shutdown-each causing periodic restart attempts. Latch-off does not occur; the device never permanently disables without external intervention. Overvoltage during startup (>16.5 V on VCC) disables the driver temporarily but does not initiate Auto Restart.