L9856

Overview

The L9856 is a high-voltage driver manufactured using BCD "OFF-LINE" technology, designed to drive N-Channel Power MOS transistors. It features a floating upper section capable of operating with voltage rails up to 160V. The device includes CMOS/TTL compatible logic inputs for easy interfacing and provides a driver current capability of 500mA source and 500mA sink. It offers dV/dt immunity of ±50V/nsec across the full temperature range and switching times of 100ns rise/fall with a 2.5nF load.

Feature Summary

• High voltage rail operation up to 160V with floating upper section
• CMOS/TTL Schmitt trigger inputs with hysteresis for noise immunity
• Integrated reset circuitry and under voltage lock out protection
• Clamping on VCC and loading circuit for external bootstrap capacitor

Applications

• Driving N-Channel Power MOS transistors in offline applications
• High voltage interface circuits requiring robust dV/dt immunity
• Systems utilizing CMOS or TTL control logic for power stage driving

Procurement Notes

Verify the specific package variant, as the L9856 is documented in an SO-8 package. Confirm that the application requires the specified 160V floating rail capability and 500mA drive current. Ensure compatibility with the required CMOS/TTL input levels and check if the integrated bootstrap loading circuit meets the design requirements without additional external components.

Selection Notes

Select this component when a high-side driver with a 160V floating capability is required for N-Channel MOSFETs. It is suitable for designs needing strong dV/dt immunity and direct interfacing with standard digital logic. Consider the SO-8 package constraints and the internal bootstrap circuit integration when evaluating board space and component count.

Part Context

The L9856 belongs to STMicroelectronics' portfolio of high-voltage drivers built on BCD technology. It is distinct from general-purpose logic drivers by its ability to handle high voltage rails and provide substantial source/sink currents. The device integrates protection features like UVLO and clamping, making it suitable for demanding offline power conversion environments.

Replacement Considerations

No public confirmed substitute part numbers are available in the provided documentation.