IR21531STRPBF - 600V Self-Oscillating Half-Bridge Driver | Infineon
MPN: IR21531STRPBF ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $1.42 | $1.42 |
| 10 | $1.21 | $12.10 |
| 100 | $0.98 | $98.00 |
| 500 | $0.82 | $410.00 |
| 1,000 | $0.7 | $700.00 |
Drop-in alternatives for IR21531STRPBF — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
IRS2153DSPBF
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View Datasheet →IRS2153DSTRPBF
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View Datasheet →IR21271STRPBF
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View Datasheet →IR2011STRPBF
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View Datasheet →IR21064STRPBF
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View Datasheet →IR2127STRPBF
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View Datasheet →IRS2184STRPBF
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View Datasheet →IR21531STRPBF Maximum Ratings & Electrical Characteristics
| Configuration | Half-Bridge |
| Driver Type | High-side and Low-side, self-oscillating |
| Number of Outputs | 2 (high-side, low-side) |
| Supply Voltage (VCC) | 10 V to 20 V |
| Internal VCC Clamp | 15.6 V |
| High-Side Offset Voltage | up to 600 V |
| Peak Source/Sink Current | 250 mA |
| Rise Time | 80 ns |
| Fall Time | 45 ns |
| Dead-Time | 0.6 microseconds (typical) |
| Oscillator | External RC programmable |
| Bootstrap Diode | Integrated |
| Input Logic | CMOS Schmitt-trigger (RC timing) |
| Operating Temperature | -40C to +125C |
| Package | 8-pin SOIC (SO-8) |
| Mounting Type | Surface Mount |
| Lead Finish | Pb-free (PBF suffix) |
| RoHS Status | Compliant (ROHS3) |
IR21531STRPBF Pin Configuration
| Pin 1 | VCC — Logic and low-side gate-drive supply (10 V to 20 V, internal 15.6 V clamp) |
| Pin 2 | RT — Oscillator timing resistor connection |
| Pin 3 | CT — Oscillator timing capacitor connection |
| Pin 4 | COM — Low-side gate-drive return (ground) |
| Pin 5 | LO — Low-side gate-drive output |
| Pin 6 | VS — High-side floating supply return (half-bridge switching node) |
| Pin 7 | HO — High-side gate-drive output |
| Pin 8 | VB — High-side floating supply (bootstrap) |
Safe Operating Area (SOA) & Thermal Characteristics
No official SOA curve available for this component. Always operate within absolute maximum ratings specified in the datasheet. Ensure adequate cooling and derate as needed.
Typical Applications
IR21531STRPBF is suitable for 7 applications: HID and Fluorescent Electronic Ballasts, DC-DC Half-Bridge Converters, Class-D Audio Amplifier Half-Bridge, Small Motor Driver Half-Bridge, Resonant and LLC Converter Drivers, LED Driver Half-Bridge Stages, Induction Heating Cooktop Half-Bridge.
HID and Fluorescent Electronic Ballasts
The IR21531STRPBF is purpose-built for HID and fluorescent electronic ballasts operating directly from rectified mains up to 600 V on the high-side rail. Its self-oscillating RC-timed half-bridge stage replaces an entire PWM controller plus gate-driver circuit, eliminating 10 to 15 discrete components while the integrated bootstrap diode removes the external bootstrap diode typically required in older IR2151 designs. The 0.6 microsecond built-in dead-time prevents MOSFET shoot-through in the resonant tank, and the 15.6 V VCC clamp protects the device against supply transients common in dimming circuits. With 80 ns rise / 45 ns fall times, switching losses stay low enough for typical ballast frequencies of 30 to 100 kHz, enabling high-efficiency lighting designs in 25 W to 150 W luminaires.
Recommended
DC-DC Half-Bridge Converters
For low-to-medium power isolated and non-isolated DC-DC half-bridge converters in the 50 W to 500 W range, the IR21531STRPBF's self-oscillating gate-driver stage simplifies the primary-side drive while the 600 V high-side rating tolerates 400 V bus voltages with substantial transient margin. The internal 15.6 V VCC clamp protects the IC from voltage spikes produced by auxiliary-winding leakage inductance, while the 250 mA peak gate current drives most 200 V to 600 V MOSFETs without external buffers. Designers set the operating frequency with a single RT/CT pair, making it straightforward to coordinate the converter with downstream resonant magnetics. Compared to a controller-plus-driver solution, this IC cuts BOM cost, PCB area, and qualification effort for compact telecom and industrial bus converters.
Recommended
Class-D Audio Amplifier Half-Bridge
Self-oscillating class-D audio amplifiers use the IR21531STRPBF as a simple output-stage gate driver for the output half-bridge, particularly in lower-power open-loop designs where audio quality is dominated by output filter design rather than PWM control. The matched propagation delays and 0.6 microsecond dead-time limit shoot-through losses, while the 600 V rating permits use with high-bus-voltage rails in 200 W to 400 W amplifiers. The 80 ns rise / 45 ns fall times reduce switching losses that would otherwise degrade THD+N. For closed-loop class-D designs the IR21571STR variant is preferred because it accepts an external PWM modulator; the IR21531STRPBF is best for simple self-oscillating topologies such as hobby audio amplifiers and powered subwoofer modules.
Recommended
Small Motor Driver Half-Bridge
Brush-type DC motor and small three-phase motor drives benefit from the IR21531STRPBF in simple half-bridge or H-bridge configurations, where the integrated timing and dead-time generation replace dedicated motor-controller ICs in cost-sensitive designs. The 250 mA gate-drive current supports most sub-100 V, sub-20 A motor MOSFETs directly without external gate buffers. The 600 V high-side rating allows operation from rectified mains in industrial motion-control appliances up to several horsepower. Programmable frequency via RT and CT lets the designer trade off acoustic noise against switching loss for a given motor inductance. For bidirectional motor control, two IR21531STRPBF stages can be paralleled or paired with a low-side half-bridge companion.
Recommended
Resonant and LLC Converter Drivers
Resonant and LLC converters operating above 100 kHz can use the IR21531STRPBF for primary-side half-bridge driving where the converter's natural resonant behavior defines the switching frequency, reducing the need for a dedicated resonant-mode controller. The IC's 80 ns rise and 45 ns fall times minimize dead-time losses that directly impact LLC efficiency at high frequency. The integrated bootstrap diode and dead-time simplify the layout of high-density 1U telecom and server power bricks. Designers select RT and CT to place the operating frequency slightly above resonance for zero-voltage switching. For very high-power (>1 kW) LLC stages, a dedicated resonant controller such as the Infineon ICE2HS01G is typically preferred.
Recommended
LED Driver Half-Bridge Stages
High-power LED driver designs using the IR21531STRPBF in the input PFC or LLC stage benefit from the integrated oscillator and dead-time generation that minimize component count in compact driver modules. The 600 V high-side rating handles 400 V PFC bus voltages with comfortable margin, while the 15.6 V VCC clamp protects against inductive transients on the auxiliary winding. The 0.6 microsecond dead-time prevents shoot-through in the half-bridge, keeping switching losses low across the wide load range required for LED dimming. The 8-pin SOIC package enables small driver PCBs suitable for space-constrained downlight and street-light fixtures operating from universal mains.
Recommended
Induction Heating Cooktop Half-Bridge
Induction heating cooktops in the 1 kW to 3 kW range use the IR21531STRPBF as a low-cost self-oscillating driver for the resonant heating coil half-bridge, taking advantage of the integrated dead-time and bootstrap functions to simplify the cooktop power electronics. The 600 V high-side rating easily supports the rectified 220 V AC bus, while the 80 ns/45 ns switching speeds keep switching losses manageable at 20 to 50 kHz cooking frequencies. The RC-timed oscillator aligns naturally with the resonant tank behavior, producing clean zero-voltage switching across the cooking-load range. Compared to a digital controller solution, the IR21531STRPBF reduces BOM cost and EMI debug time in cost-sensitive consumer appliances.
Recommended
Recommended Products Summary
Engineering reference data for IR21531STRPBF — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | IRS2153DSPBF | IRS2153DSTRPBF | IR21271STRPBF | IR2011STRPBF | IR21064STRPBF | IR2127STRPBF | IRS2184STRPBF |
|---|---|---|---|---|---|---|---|---|
| Brand | Infineon | Infineon | Infineon | Infineon | Infineon | Infineon | Infineon | Infineon |
| Package | 8-SOIC | 8-SOIC - same | 8-SOIC - same | 8-SOIC - same | 8-SOIC - same | 8-SOIC - same | 8-SOIC - same | 8-SOIC - same |
| High-Side Offset Voltage | 600 V | 600 V | 600 V | 500 V | 200 V | 600 V | 600 V | 600 V |
| Self-Oscillating (Internal RC Timer) | Yes | Yes | Yes | No (externally driven) | No (externally driven) | No (externally driven) | No (externally driven) | No (externally driven) |
| Internal Bootstrap Diode | Yes | Yes | Yes | Yes | No (external required) | Yes | Yes | Yes |
| Dead-Time | 0.6 microseconds | 0.6 microseconds | 0.6 microseconds | Programmable / external | [DATA_NEEDED] | [DATA_NEEDED] | [DATA_NEEDED] | Programmable / external |
| Peak Gate Current (source/sink) | 250 mA | 250 mA | 250 mA | 1 A | 1 A | 360 mA | [DATA_NEEDED] | 1.9 A / 2.3 A |
| VCC Supply Range | 10 V to 20 V (15.6 V clamp) | 10 V to 20 V (15.6 V clamp) | 10 V to 20 V (15.6 V clamp) | [DATA_NEEDED] | [DATA_NEEDED] | [DATA_NEEDED] | [DATA_NEEDED] | 10 V to 20 V |
| Recommended for New Designs (per Infineon) | Yes (legacy, IRS2153D preferred) | Yes (preferred replacement) | Yes (preferred replacement) | Yes | Yes | Yes | Yes | Yes |
Key Differentiators
- Integrated 600 V level shifter with internal bootstrap diode (vs IR2011STRPBF)
- Self-oscillating RC timer eliminates external PWM controller (vs IR21271STRPBF)
- Pin-compatible preferred replacement for new designs (vs IRS2153DSPBF)
Design Notes
Bootstrap capacitor sizing is critical for reliable high-side switching. The bootstrap capacitor (VB to VS) must be sized large enough to supply the high-side gate charge plus quiescent current during the high-side on-time, and to recharge quickly during the low-side on-time. A 1 microfarad to 10 microfarad ceramic capacitor with low ESR is typical for ballast and resonant applications; verify with the IC's gate-charge specification and your maximum on-time.
Estimated: At 250 mA peak gate current and 1 MHz operation into a 50 nC gate charge, gate-drive losses are approximately 12.5 mW per switch (P = Qg x Vgs x fsw). The 8-SOIC package has theta_JA around 150 C/W on a standard 1 oz JEDEC test board, giving a junction temperature rise below 2 C at this power level. The dominant thermal concern is internal VCC clamp conduction during supply over-voltage events, not gate-drive losses. Provide adequate copper pour on the COM pin to dissipate any clamp current.
Keep the high-side switching node (VS) loop area minimal to limit EMI and voltage transients on the bootstrap supply. Place the bootstrap capacitor and VCC bypass capacitor as close as possible to the IC pins, and route the high-side gate-drive loop away from low-level timing components (RT, CT). Use a ground plane beneath the IC to provide low-inductance COM return, and keep the switching node traces short and wide to minimize ringing.
Do not exceed the 600 V high-side offset rating during transient events such as inductive load turn-off or load dump on rectified AC rails. The internal 15.6 V VCC clamp activates at 15.6 V but is not designed to dissipate continuous power - use a regulated 12 V to 15 V supply for normal operation. The oscillator RT and CT values must be selected to keep frequency above the audio band (>20 kHz) to avoid audible noise in motor and ballast applications.
Separate the analog timing section (RT, CT, COM) from the high-voltage switching section (VB, VS, HO) with a ground plane split if necessary, and use a star-ground connection at the COM pin. Place the VCC bypass capacitor (typically 0.1 microfarad ceramic in parallel with 1 microfarad to 10 microfarad bulk) immediately at the VCC pin. Avoid running signal traces beneath the high-voltage switching node to prevent capacitive coupling and noise injection into the timing section.
Compliance Information
PBF suffix denotes Pb-free finish and RoHS3 compliance per Infineon product page. AEC-Q100 qualification not stated in available data. REACH compliance standard for Infineon power management ICs.
