Infineon Technologies IRS2983STRPBF

Overview

IRS2983STRPBF from Infineon Technologies (formerly International Rectifier) is a flyback LED driver control IC operating in critical-conduction mode with primary-side constant power regulation, 1.00 V reference voltage, 1.54 V ZX-arm threshold, and 1.25 V CS over-current sense threshold-enabling isolated, optocoupler-free LED drivers for street lighting and commercial signage.

For engineers reviewing the IRS2983STRPBF datasheet, IRS2983STRPBF pinout, IRS2983STRPBF application, or IRS2983STRPBF equivalent, key selection criteria include its 60 ns turn-on rise time, 30 ns turn-off fall time, 200 mA source / 400 mA sink gate drive capability, micropower startup (150 µA), and open-load overvoltage protection at 5.15 V on the ZX pin.

Technical Context

The IRS2983STRPBF implements primary-side regulation via an internal multiplier with KMULT = 2.00 and VDC input range up to 6.0 V, eliminating secondary feedback while maintaining ±5% output power accuracy across line and load variations. Its CrCM/DCM operation ensures high power factor (>0.9) and low THD in single-stage flyback LED drivers fed from unsmoothed rectified AC.

Integrated protection includes blanking-timed current sensing (tBLANK = 200 ns), latch-immune fault recovery, and dual-threshold ZX pin comparator (VZX+ = 1.54 V, VOVTH = 5.15 V) for open-load detection and overvoltage shutdown-enabling robust operation without external supervision circuitry.

Key Specifications

Pinout & Package

IRS2983STRPBF is housed in an 8-lead SOIC (SO8N) package with standard JEDEC MS-012AC footprint, moisture sensitivity level MSL2, and lead temperature rating of 300°C for 10 seconds.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar flyback LED driver control applications.

Compared with UCC28810DR and NCP1083DR2G, IRS2983STRPBF uniquely combines primary-side constant power regulation, CrCM operation, and integrated open-load protection-making it optimal for isolated, high-reliability outdoor LED drivers where optocoupler elimination and robust fault handling are mandatory.

Availability

IRS2983STRPBF is available at Aetrix Electronics and suitable for street lighting, commercial signage, and industrial high-bay lighting requiring stable component supply, long-term lifecycle support, and RoHS-compliant manufacturing.

Supply support for IRS2983STRPBF 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 global semiconductor leader specializing in power management, automotive, and industrial control solutions, with legacy roots in International Rectifier's high-voltage analog IC expertise.

The IRS2983 product line was designed specifically for cost-effective, isolated LED driver topologies requiring primary-side regulation, high power factor, and comprehensive fault protection without secondary feedback.

FAQ

What is the function of the ZX pin on IRS2983STRPBF?

The ZX pin senses reflected voltage from the flyback transformer's auxiliary winding to detect zero-crossing for CrCM timing and monitor output overvoltage. It features dual thresholds: 1.54 V arm threshold for demagnetization detection and 5.15 V overvoltage threshold for open-load shutdown-enabling accurate timing and fail-safe protection without secondary sensing.

Can IRS2983STRPBF operate without an auxiliary winding?

No. The IRS2983STRPBF requires an auxiliary winding to sustain VCC after initial HV startup. While the HV pin provides micropower startup current (150 µA) from the rectified AC bus, the auxiliary winding must deliver ≥14 V to maintain regulation and gate drive-no internal LDO or charge pump replaces this requirement.

How does primary-side constant power regulation work in IRS2983STRPBF?

It uses a multiplier circuit that scales the error amplifier output (COMP) by the average rectified line voltage (VDC) and primary current (CS). With VPREF = 1.00 V and KMULT = 2.00, the loop forces average output power to remain constant across input voltage variations-achieving ±5% regulation without optocoupler or secondary shunt regulator.

What is the maximum recommended operating junction temperature?

The IRS2983STRPBF has a maximum junction temperature of +150°C per absolute ratings, but the recommended operating range is –25°C to +125°C. Thermal design must ensure RθJA ≤ 200°C/W under still-air conditions; exceeding TJ = 125°C triggers thermal foldback, reducing output power to protect the IC and external MOSFET.