IRS20957STRPBF - Protected Class D Audio Driver | Infineon
MPN: IRS20957STRPBF ✗ End of LifeIRS20957STRPBF Overview
A Class D audio driver is a gate-drive IC positioned between a PWM audio controller and the power MOSFETs of a half-bridge or full-bridge output stage. Within the broader hierarchy, it belongs to the power MOSFET driver category and the wider power-management IC family. Unlike a complete Class D audio amplifier, the IRS20957STRPBF does not directly reproduce an audio output; it drives external power transistors at the voltage and current levels required by the loudspeaker stage.
The IRS20957STRPBF combines a floating PWM input with two gate-driver outputs, high-voltage and high-speed operation, short-circuit protection, programmable bidirectional over-current protection, and self-reset behavior. Its 10 V to 15 V operating supply range supports conventional Class D audio power stages, while the floating input architecture helps simplify the interface between a PWM modulator and externally powered MOSFETs.
The device is intended to provide protection and controlled gate drive around externally selected power MOSFETs. Programmable dead time helps establish a non-overlap interval between high-side and low-side conduction, reducing the risk of shoot-through. The protected over-current function can interrupt operation following a fault and automatically restore the driver after the fault condition clears, although the final protection thresholds and timing must be established from the manufacturer datasheet and power-stage design.
Typical uses include mono and multichannel Class D loudspeaker amplifiers, subwoofer amplifiers, compact consumer-audio systems, powered speakers, and industrial audio drivers. Its protected, high-speed gate-drive function is especially relevant where external MOSFETs require controlled switching, fault handling, and adequate dead time to prevent simultaneous conduction in a half bridge.
Designers should pay particular attention to the power-MOSFET selection, gate-drive layout, dead-time setting, and protection thresholds. The driver must be placed close to the external MOSFETs so that gate-drive traces remain short and robust against ringing. Input and output return paths should also be arranged carefully to prevent high-current switching loops from disturbing the PWM input reference.
This page consolidates verified distributor information, cross-reference candidates, package details, pricing context, and practical design guidance. It distinguishes a same-package cross-reference from a confirmed drop-in replacement and avoids presenting packaging-only order codes as distinct engineering alternatives.
Drop-in alternatives for IRS20957STRPBF — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with IRS20957STRPBF (same form factor and footprint) — differing in Over-Current Protection, Product Type.
L6393D
✅ Drop-In📋 Reference alternative (not in catalog)
L6389EDTR
✅ Drop-In📋 Reference alternative (not in catalog)
IRS20957STRPBF Maximum Ratings & Electrical Characteristics
| Product Type | Protected Class D audio MOSFET driver |
| Output Configuration | 1-channel mono Class D driver |
| Driver Output Type | 2 outputs: high-side and low-side |
| Supply Voltage Range | 10 V to 15 V |
| PWM Input | Floating PWM input |
| PWM Logic | Inverting or non-inverting |
| Over-Current Protection | Programmable bidirectional protection with self-reset |
| Dead-Time Control | Programmable preset dead time |
| Short-Circuit Protection | Supported |
| Architecture | High-voltage, high-speed MOSFET driver |
| Package | 16-SOIC narrow package |
| Package Width | 3.90 mm (0.154 inch) |
| Operating Temperature | -40 °C to 125 °C ambient |
| Mounting Type | Surface mount |
| Shipping Package | Tape and reel |
| Country of Origin | China or Thailand |
IRS20957STRPBF tape and reel Pin Configuration Guide
Pin configuration for IRS20957STRPBF (tape and reel package). This power device features gate, drain, and source terminals. For non-polarized packages, refer to the manufacturer datasheet for exact pin 1 orientation and footprint details. Common applications include power supply design, motor driving, and load switching.
No detailed pinout data available for IRS20957STRPBF.
Refer to the datasheet for full pin configuration.
Typical Applications
IRS20957STRPBF is suitable for 6 applications: Class D Subwoofer Power Stage, Powered Speaker Amplifier, Multichannel Consumer Audio Amplifier, Industrial Audio Signal Amplifier, Digital Audio Preamplifier Output Stage, Audio Monitoring and PA System.
Class D Subwoofer Power Stage
The IRS20957STRPBF is suitable for a protected external-MOSFET subwoofer power stage because it combines a floating PWM input with high-side and low-side gate outputs. Its verified 10 V to 15 V operating range fits conventional Class D power-stage supplies, while programmable dead time helps prevent the output transistors from conducting simultaneously. The protected driver also includes programmable bidirectional over-current handling with self-reset, which is valuable when a loudspeaker load faults or an output transistor develops abnormal conduction. The MOSFETs, gate resistors, protection thresholds, and output filter still require separate engineering selection; the driver does not replace them.
Recommended
Powered Speaker Amplifier
The IRS20957STRPBF can drive external power MOSFETs in a powered-speaker Class D output stage. Its high-voltage, high-speed driver architecture is intended to convert a PWM command into controlled gate-drive signals for a half-bridge or full-bridge arrangement. The floating PWM input supports integration with an audio modulator, while the high-side and low-side outputs support symmetrical gate control. Programmable dead time is particularly important in a compact PCB where excessive propagation delay or unequal gate loops could create shoot-through. Suitable MOSFETs, output inductors, and an LC filter must be designed around the amplifier’s required power and bandwidth.
Recommended
Multichannel Consumer Audio Amplifier
Multiple IRS20957STRPBF channels can be used in a multichannel consumer-audio amplifier when each channel requires protected, independent external-MOSFET drive. The mono Class D driver architecture allows a PWM controller to feed a floating input while separate high-side and low-side outputs control the external transistors. Its protected over-current operation with self-reset is useful in systems where channel wiring or loudspeaker loads may be exposed to faults. Board planning should keep every gate-drive loop compact and provide independent decoupling close to the device. The exact supply arrangement and channel synchronization strategy should be established from the complete amplifier reference design.
Recommended
Industrial Audio Signal Amplifier
The IRS20957STRPBF can serve as the protected MOSFET gate driver in an industrial audio amplifier that must drive external transistors rather than a low-power integrated output. Its operating temperature record of -40 °C to 125 °C ambient makes it relevant to equipment exposed to a broad industrial environment, subject to correct PCB thermal design and external-MOSFET selection. Programmable dead time supports controlled half-bridge switching, and the self-reset over-current response helps limit fault duration. Protection settings must be tuned to the actual transistor and load characteristics rather than copied without verification, because excessive sensitivity could interrupt normal audio peaks.
Recommended
Digital Audio Preamplifier Output Stage
A digital-audio preamplifier can use the IRS20957STRPBF when the final output stage requires protected MOSFET drive at higher voltage or power than the audio converter can provide directly. The device accepts a floating PWM signal and generates separate high-side and low-side drive outputs for external switching transistors. This separation allows the digital signal-processing section and analog output power stage to use appropriate supply domains. The floating input arrangement can simplify PWM routing, but common-mode and return-path behavior must be checked against the chosen modulator and gate-drive circuitry. Very short gate loops and a carefully partitioned high-current ground path remain essential for stable operation.
Recommended
Audio Monitoring and PA System
The IRS20957STRPBF is applicable to powered audio-monitoring and public-address systems that use external power MOSFETs and require controlled half-bridge or full-bridge switching. Its floating PWM input permits connection to a suitable digital audio modulator, while protected gate-drive outputs help contain startup and overload conditions. Programmable dead time provides an adjustable non-overlap region for the external transistors, reducing shoot-through risk in a multi-channel amplifier. In installation equipment, however, the designer must still account for load transients, cable faults, thermal conditions, and the correct selection of power devices. The 10 V to 15 V device supply range must be reconciled with the external MOSFET gate-drive requirements.
Recommended
Recommended Products Summary
Engineering reference data for IRS20957STRPBF — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | L6393D | L6389EDTR |
|---|---|---|---|
| Brand | Infineon Technologies | STMicroelectronics | STMicroelectronics |
| Package | 16-SOIC narrow package | 16-SOIC | 16-SOIC |
Key Differentiators
- Verified protected audio-driver feature set (vs L6393D)
- Documented operating range (vs L6389EDTR)
- Purpose-built Class D gate-drive architecture (vs L6393D)
Design Notes
Place the IRS20957STRPBF close to the external MOSFETs and keep the high-side and low-side gate loops short, compact, and symmetrical. Avoid routing the floating PWM input alongside gate-drive or power-current paths. The external MOSFET gate resistance, gate charge, and switching frequency must be checked against the driver's published drive capability before finalizing the layout.
Configure programmable dead time and over-current thresholds from the manufacturer datasheet and the selected MOSFETs rather than from generic guidance. Verify that the 10 V to 15 V operating range supports the gate-drive amplitude and supply arrangement used by the power stage. The protection threshold must remain above normal load transients while still responding quickly to a genuine short circuit.
Do not treat IRS20957SPBF and IRS20957STRPBF as different drop-in alternatives because the distinction primarily concerns ordering and packaging. Likewise, a 16-SOIC outline alone does not prove that an alternative is pin-compatible. Confirm every lead name, pin number, supply requirement, PWM polarity, fault behavior, and timing characteristic before substituting L6393D or L6389EDTR.
Compliance Information
The supplied excerpts identify an estimated EOL date of 2022, country of origin as China or Thailand, and an ambient operating range of -40 °C to 125 °C. No explicit RoHS, REACH, lead-free, halogen-free, or conflict-minerals declaration was provided.
