NSL21611-Q1HMSR

Overview

The NSL21611-Q1HMSR is an automotive-grade single-channel linear constant current LED driver with a maximum output current capability of 450 mA. It features a wide supply voltage range from 5 V to 40 V, enabling direct connection to automotive battery systems. The device utilizes a unique thermal balancing design that establishes an automatic power balancing loop between the internal output channel and an external shunt resistor. This architecture directs the majority of power dissipation to the external resistor, effectively overcoming thermal limitations associated with high-current linear drivers. It supports PWM dimming and includes comprehensive diagnostic functions such as LED open-load and short-to-ground detection.

Feature Summary

• Implements a unique thermal balancing design with an automatic power balancing loop between the output channel and an external shunt resistor to manage heat dissipation.
• Provides full diagnostic capabilities including LED open-load detection with auto-recovery and LED short-to-ground detection with auto-recovery.
• Offers flexible fault bus connection options allowing for either 'all off if one fails' or 'others remain on if one fails' logic.
• Supports PWM dimming control for adjustable brightness applications.

Applications

• Automotive exterior rear lighting: position lights, fog lights, stop lights, and taillights
• Automotive miscellaneous exterior lighting: center high-mounted stop lamps, daytime-running lamps, turn indicators, door handles, and blind spot detection indicators
• Automotive interior lighting: reading lamps and overhead consoles

Procurement Notes

Verify the specific suffix HMSR corresponds to the required tape-and-reel packaging configuration for automated assembly lines. Confirm that the AEC-Q100 Grade 1 qualification meets the thermal requirements for your specific application environment, ranging from -40°C to +125°C. Ensure the external shunt resistor selection aligns with the thermal balancing design specifications to maintain optimal performance and reliability.

Selection Notes

Select this component when driving high-current LEDs directly from a 40 V automotive supply where thermal management is critical. The integrated thermal balancing feature allows for higher current densities compared to standard linear drivers by shifting power dissipation externally. Consider the diagnostic flexibility for safety-critical lighting systems requiring specific fault response behaviors via the FAULT pin configuration.

Part Context

This part belongs to the NSL21610/1 series of automotive linear LED drivers manufactured by NOVOSENSE. The series is designed specifically for robust performance in harsh automotive environments. The NSL21611 variant distinguishes itself through its enhanced current handling and thermal balancing capabilities, making it suitable for demanding exterior and interior lighting applications that require high reliability and comprehensive fault diagnostics.

Replacement Considerations

The NSL21610 is the related counterpart within the same series. Verify if the specific current or thermal balancing requirements necessitate the NSL21611 over the NSL21610. No other direct substitute part numbers are confirmed in the provided documentation.