Infineon Technologies IRS2552DSTRPBF

Overview

IRS2552DSTRPBF from Infineon Technologies (formerly International Rectifier) is a high-voltage half-bridge CCFL/EEFL ballast controller IC with integrated gate drivers, programmable ignition frequency (36.5–71 kHz), 500 ns–2 µs programmable deadtime, and dual-mode dimming (0–5 V analog or burst). It drives IGBT/MOSFET power stages in LCD backlight inverters requiring lamp current control and latched open-circuit protection.

For engineers reviewing the IRS2552DSTRPBF datasheet, IRS2552DSTRPBF pinout, IRS2552DSTRPBF application, or IRS2552DSTRPBF equivalent, key selection criteria include its 600 V high-side offset capability, ±50 V/ns dVS/dt immunity, 15.6 V VCC clamp, micro-power startup (300 µA), and support for multi-lamp topologies with soft-start per burst cycle.

Technical Context

The IRS2552DSTRPBF integrates a self-oscillating half-bridge driver with independent high-side (HO) and low-side (LO) outputs rated for 300 mA source / 450 mA sink, enabling direct drive of external power switches without external level shifters. Its oscillator uses CT/CR timing components to set ignition and run frequencies, while DT pin programming adjusts deadtime between HO/LO transitions to prevent shoot-through.

Lamp protection includes latched open-circuit detection via CS pin (0.6 V threshold), shutdown activation at SD pin (2.0 V threshold), and CD pin overvoltage-triggered fault latch. The internal bootstrap FET supports floating high-side supply with 13.5 V turn-on and 55 mA VB sourcing capability under 0.1 µF capacitor.

Key Specifications

Pinout & Package

IRS2552DSTRPBF is housed in a 16-lead SOIC (narrow body) package with standard JEDEC MS-012AC footprint and moisture sensitivity level MSL3.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar CCFL/EEFL ballast controller applications.

Compared with FAN7711MX and IRS2153DSTRPBF, the IRS2552DSTRPBF delivers integrated lamp management-combining ignition sequencing, analog/PWM dimming, and hardware-fault latching-reducing external component count by ≥7 parts and eliminating firmware-dependent protection logic.

Availability

IRS2552DSTRPBF is available at Aetrix Electronics and suitable for LCD backlighting, medical imaging displays, industrial HMIs, and avionics cabin displays requiring stable component supply and long-term lifecycle support.

Supply support for IRS2552DSTRPBF 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, sensing, and automotive ICs, with legacy expertise in high-voltage gate drivers from its acquisition of International Rectifier.

The IRS2552DSTRPBF belongs to Infineon's CCFL/EEFL ballast controller product line, engineered specifically for energy-efficient, flicker-free LCD backlight inverters with built-in safety and dimming intelligence.

FAQ

What is the maximum allowable dV/dt on the VS pin?

The IRS2552DSTRPBF specifies a maximum allowable dVS/dt of ±50 V/ns at the VS pin. Exceeding this rate risks false triggering of the high-side level shifter or latch-up due to capacitive coupling. Layout best practices include minimizing trace inductance between VS and the power switch source/emitter, using local 100 nF ceramic decoupling, and avoiding routing VS near noisy nodes.

How does the bootstrap FET function during startup?

During micro-power startup, the internal bootstrap FET activates when VCC rises above 10.5 V (UVLO+ threshold), sourcing up to 55 mA into the bootstrap capacitor (CBS). It maintains VB at ~13.5 V to power the high-side driver stage. Once running, VB is sustained by charge-pump action from HO switching, but the FET remains active during fault recovery and soft-start phases to ensure reliable high-side biasing.

Can the DIM pin accept PWM signals directly?

No-the DIM pin is designed exclusively for 0–5 V analog DC voltage input. Applying PWM causes erratic lamp current regulation due to internal RC filtering and lack of dedicated PWM demodulation circuitry. For PWM dimming, use the SD pin to gate entire inverter operation in burst mode, leveraging the built-in per-burst soft-start feature for flicker-free performance.

What happens during latched open-circuit fault?

When CS pin voltage falls below 0.6 V (indicating no lamp current), the IRS2552DSTRPBF immediately disables HO and LO outputs and asserts a latched fault state. Recovery requires cycling VCC power or pulling SD low then high. This prevents repeated high-voltage ignition attempts that could damage transformers or generate EMI, and eliminates need for external fault-handling logic.