Infineon Technologies IR21593STRPBF

Overview

IR21593STRPBF from Infineon Technologies is a dimming electronic ballast controller and 600V half-bridge gate driver IC for fluorescent lamps. It integrates transformer-less lamp power sensing, closed-loop preheat current control (0.8–2.1 µA CPH charging), programmable ignition-to-dim time, and 0.5–5 VDC analog dimming interface. Used in single-lamp dimmable ballasts with SOIC-16 packaging.

For engineers reviewing the IR21593STRPBF datasheet, IR21593STRPBF pinout, IR21593STRPBF application, or IR21593STRPBF equivalent, key selection criteria include VCO frequency range (30–230 kHz), HO/LO deadtime (1.0 µs), internal 15.6 V zener-clamped VCC, lamp fault protection logic, and phase-control-based power regulation architecture.

Technical Context

The IR21593STRPBF implements a voltage-controlled oscillator (VCO) with externally programmable minimum frequency (via RFMIN resistor, 10–100 kΩ), enabling precise lamp frequency control from 30 kHz to 230 kHz. Its phase-control architecture enables transformer-less lamp power sensing by monitoring VS–COM offset during half-bridge switching.

Preheat, ignition, dim, and fault states are managed via internal state machine with dedicated pins: CPH (preheat timing), IPH (preheat current reference), SD (shutdown latch), and CS (current sense input with 1.2–1.9 V overcurrent threshold). The IC supports automatic restart after UVLO, thermal shutdown (165°C), or lamp removal detection.

Key Specifications

Pinout & Package

IR21593STRPBF is housed in a 16-pin narrow-body SOIC package (body width 3.9 mm, JEDEC MS-012AC), optimized for surface-mount assembly in compact ballast PCBs.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dimming ballast controller applications.

Compared with IR21592STRPBF and UCC3305D, the IR21593STRPBF delivers faster dimming transitions (via higher VCO bandwidth), tighter deadtime control (1.0 µs), and fully integrated preheat/ignition sequencing-reducing external component count by ≥4 passive devices in typical single-lamp designs.

Availability

IR21593STRPBF is available at Aetrix Electronics and suitable for commercial lighting ballasts, architectural dimmable fixtures, and industrial fluorescent control systems requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for IR21593STRPBF 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 global manufacturing and quality certification to ISO 9001 and IATF 16949.

The IR2159x series belongs to Infineon's fluorescent ballast controller product line, designed specifically for high-reliability, single-lamp dimmable electronic ballasts with integrated gate driving and comprehensive fault protection.

FAQ

What is the function of the CPH pin on the IR21593STRPBF?

The CPH pin serves as the preheat timing capacitor node. It is charged by a current sourced from the IPH pin (0.8–2.1 µA), and its voltage ramp determines preheat duration. When CPH reaches ~5.0 V, the IC transitions from preheat to ignition mode. External capacitor value directly sets preheat time, enabling precise filament warm-up before lamp strike.

How does the IR21593STRPBF detect successful lamp ignition?

Lamp ignition is detected by monitoring the CS pin voltage during the transition from preheat to ignition. After CPH reaches threshold, the IC enables current sensing. A rapid drop in CS voltage-indicating reduced lamp impedance post-strike-triggers the state machine to exit ignition mode and enter dim mode. This avoids repeated re-ignition attempts and protects filaments.

Can the IR21593STRPBF operate without a bootstrap capacitor?

No. The VB and VS pins require a bootstrap capacitor between VB and VS to supply the high-side gate driver (HO). Without it, HO cannot sustain gate voltage during high-side conduction, causing half-bridge failure. Typical value is 0.1–0.22 µF ceramic with low ESR; placement must minimize loop inductance to avoid voltage spikes.

What protection features are built into the IR21593STRPBF?

The IC integrates six protection mechanisms: undervoltage lockout (VCC <12.5 V), overcurrent (CS >1.9 V), thermal shutdown (TJ >165°C), lamp removal detection (SD >2.0 V), DC bus fault (VDC <3.0 V), and ignition failure detection (CS remains high >100 ms). All trigger fault-mode latching with 240 µA quiescent current and require SD pin reset or power cycle to recover.