L6491D

Overview

The L6491D is a high-voltage half-bridge gate driver manufactured using BCD6 OFF-LINE technology, designed for N-channel power MOSFETs and IGBTs. It features a floating high-side section supporting voltage rails up to 600 V. The device provides 4 A source/sink current capability with switching times of 15 ns rise/fall under a 1 nF load. Logic inputs are CMOS/TTL compatible down to 3.3 V. It includes an integrated bootstrap diode, adjustable deadtime, interlocking functions, and a smart shutdown feature. The package is a 14-pin SO tube.

Feature Summary

• High voltage rail support up to 600 V with dV/dt immunity of ± 50 V/ns across the full temperature range.
• Integrated comparator for fast fault protection against over-current and over-temperature conditions.
• Smart shutdown function combined with adjustable deadtime and interlocking mechanisms for enhanced system safety.
• CMOS/TTL logic inputs compatible down to 3.3 V, facilitating direct interfacing with microcontrollers and DSPs.

Applications

• Industrial motor control systems
• Power supply designs utilizing off-line technologies
• Inverter circuits driving N-channel power MOSFETs or IGBTs

Procurement Notes

Verify the specific ordering suffix when purchasing. The 'D' suffix indicates a tube package, whereas 'TR' denotes a reel. Ensure the component matches the required package type for your PCB layout. Confirm RoHS compliance status as per the latest manufacturer documentation. Cross-reference the datasheet revision to ensure all electrical parameters align with your design requirements before finalizing procurement orders.

Selection Notes

Select this component for applications requiring robust high-side drive capabilities in industrial environments. The integrated bootstrap diode simplifies circuit design by reducing external component count. Consider the 4 A peak current capability for driving larger power switches. The adjustable deadtime and interlocking functions are critical for preventing shoot-through in half-bridge configurations. Ensure the input logic levels match your controller's output voltage.

Part Context

The L6491D belongs to STMicroelectronics' portfolio of high-voltage gate drivers. It is part of a series designed for demanding industrial applications where reliability and compactness are paramount. The device leverages advanced BCD technology to integrate high-voltage and low-voltage circuits on a single chip, offering a complete solution for half-bridge driving needs.

Replacement Considerations

The L6491DTR is the tape-and-reel version of the same functional device. Verify pinout compatibility if substituting with other half-bridge drivers from different manufacturers. Check voltage ratings and current capabilities to ensure equivalent performance in the target application.

FAQ

What is the maximum voltage rating for the high-side floating section?

The high-side (floating) section is designed to withstand a voltage rail up to 600 V.

Does the L6491D include an internal bootstrap diode?

Yes, the device features an integrated bootstrap diode to simplify the external circuit design.

How does the device handle fault protection?

It includes an integrated comparator for fast protection against over-current and over-temperature, along with a smart shutdown function.