L6571AD

Overview

The L6571AD is a high-voltage half-bridge gate driver manufactured by STMicroelectronics, designed for driving external N-channel power MOSFETs and IGBTs. It features a built-in programmable oscillator with frequency set by external components and supports direct logic signal input. The device includes internal dead-time control to prevent cross-conduction, under-voltage lockout with hysteresis, and ESD protection. It operates within a supply voltage range of 10V to 16.6V and withstands high-voltage rails up to 600V. Available in SOIC-8 surface-mount packaging, it functions reliably across temperatures from -40°C to +125°C.

Feature Summary

• High-voltage capability supporting rails up to 600V with dV/dt immunity up to ±50V/ns
• Integrated programmable oscillator allowing frequency adjustment via external resistor and capacitor
• Internal dead-time generation prevents simultaneous conduction of power devices
• Under-voltage lockout with hysteresis ensures stable operation during startup and fault conditions

Applications

• Electronic ballast control for fluorescent lamps
• Half-bridge resonant converter topologies
• High-voltage motor drive systems
• Induction heating applications

Procurement Notes

Verify component authenticity through authorized STMicroelectronics distributors or certified partners. Confirm the specific suffix indicates the correct package variant and temperature grade. Check for recent product discontinuation notices as availability may be limited. Ensure storage conditions comply with moisture sensitivity level requirements before soldering.

Selection Notes

Select this driver for applications requiring robust high-side switching with integrated timing control. Compare the L6571A and L6571B variants based on required dead-time specifications. Ensure the external oscillator components match the desired switching frequency. Verify that the peak output current capabilities meet the gate charge requirements of the target power devices.

Part Context

The L6571 belongs to STMicroelectronics' portfolio of high-voltage half-bridge drivers intended for offline and high-power applications. It simplifies design by integrating oscillator, dead-time, and bootstrap functions. This series is commonly used in lighting control and power conversion where reliability and compactness are critical.

Replacement Considerations

Public confirmed substitute part numbers: L6571AD013TR, L6571A, L6571B.