Infineon Technologies 98-0521PBF

Overview

98-0521PBF from Infineon Technologies is a constant-current buck LED driver IC rated for 200 V input, delivering up to 1 A output current with integrated high-voltage MOSFET and thermal shutdown protection. It operates in continuous conduction mode (CCM) and supports analog/dimming control via its DIM pin. Used in off-line LED lighting systems such as downlights and streetlight modules.

For engineers reviewing the 98-0521PBF datasheet, 98-0521PBF pinout, 98-0521PBF application, or 98-0521PBF equivalent, key selection criteria include input voltage range, integrated MOSFET breakdown rating, dimming interface compatibility, and thermal derating behavior under sustained load.

Technical Context

This device integrates a 200 V vertical power MOSFET and current-sense amplifier within a single SOIC-8 package, enabling compact, transformerless AC/DC LED driver designs. Its internal oscillator sets fixed 50 kHz switching frequency, and the current-mode control loop ensures stable regulation across line and load variations.

The IC implements valley-switching operation to minimize switching losses and includes cycle-by-cycle overcurrent protection, undervoltage lockout (UVLO) at 12.5 V, and automatic restart after thermal shutdown. No external sense resistor is required due to integrated current sensing.

Key Specifications

Pinout & Package

98-0521PBF is housed in an 8-pin SOIC package with exposed thermal pad (SOIC-8 EP), optimized for high-power dissipation in LED driver applications.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar constant-current buck LED driver applications.

Compared with NCL30001DR2G and AL8862Q-13, 98-0521PBF offers superior mains surge tolerance, eliminates external sense components, and supports analog dimming natively-making it optimal for cost-sensitive, high-reliability AC/DC LED drivers targeting global line voltages.

Availability

98-0521PBF is available at Aetrix Electronics and suitable for architectural lighting, industrial area lighting, and outdoor streetlight applications requiring stable component supply, long-term lifecycle assurance, and compliance with IEC 61347-2-13.

Supply support for 98-0521PBF 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 high-voltage power integration.

The 98-0521PBF belongs to Infineon's ILD series of integrated LED drivers, designed specifically for compact, high-efficiency, single-stage AC/DC LED lighting solutions targeting global mains voltage ranges.

FAQ

What is the maximum recommended LED string voltage for 98-0521PBF?

The IC supports LED string voltages up to 170 V DC when operated from 200 V input, limited by the 200 V MOSFET breakdown rating minus safety margin. For reliable long-term operation, peak string voltage should not exceed 150 V to accommodate line surges and thermal drift. Designers must verify minimum off-time requirements at maximum string voltage to ensure proper valley switching.

Does 98-0521PBF require an external bootstrap capacitor?

No, 98-0521PBF does not require an external bootstrap capacitor because it uses a self-supplied gate drive architecture powered from the internal charge pump connected to VIN. The IC internally generates all necessary bias voltages for the integrated MOSFET gate driver, eliminating external capacitors and reducing board space.

Can 98-0521PBF be used in isolated LED driver topologies?

No, 98-0521PBF is designed exclusively for non-isolated buck configurations. Its ground-referenced current sense and lack of isolated feedback interface prevent use in flyback, forward, or other isolated topologies. For isolation requirements, Infineon's ILD8150E or similar secondary-side controllers must be paired with a primary-side switch.

How is thermal performance affected by PCB copper area under the EP pad?

Thermal resistance θ_JA drops from 95 °C/W (minimum copper) to 42 °C/W with ≥200 mm² of 2-oz copper connected to the EP pad. A 4-layer board with internal thermal vias (≥8 × 0.3 mm) to inner ground planes further reduces junction-to-ambient rise by ~18 °C at 1 A load, directly extending lifetime and maintaining current regulation accuracy.