Overview
The NSI50150ADT4G is an adjustable constant current regulator (CCR) and LED driver produced by onsemi. This device is designed to provide a cost-effective solution for regulating current in LEDs, leveraging Self-Biased Transistor (SBT) technology. It is capable of operating over a wide voltage range and features immediate turn-on, making it suitable for various applications including automotive, industrial, and commercial signage. The NSI50150ADT4G is qualified to the stringent AEC-Q101 standard, ensuring it is lead-free, RoHS compliant, and uses halogen-free molding compound.
Key Specifications
| Characteristic | Symbol | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| Anode-Cathode Voltage | Vak | 50 | V | ||
| Steady State Current @ Vak = 7.5 V | Ireg(SS) | 135 | 150 | 165 | mA |
| Voltage Overhead | Voverhead | 1.8 | V | ||
| Pulse Current @ Vak = 7.5 V | Ireg(P) | 140.5 | 158 | 175.35 | mA |
| Operating and Storage Junction Temperature Range | TJ, Tstg | -55 | 175 | °C | |
| Thermal Resistance, Junction-to-Ambient | RθJA | 60 | °C/W | ||
| Thermal Resistance, Junction-to-Tab | RψJ-TAB | 6.3 | °C/W |
Key Features
- Robust Power Package: 4.2 Watts, ensuring high power handling capability.
- Adjustable Current: Up to 350 mA, adjustable via the Radj pin.
- Wide Operating Voltage Range: Supports voltages up to 50 V.
- Immediate Turn-On: Device turns on immediately with only 0.5 V across it.
- Voltage Surge Suppressing: Protects LEDs from voltage surges.
- UL94-V0 Certified: Ensures high safety standards.
- SBT (Self-Biased Transistor) Technology: Provides efficient current regulation.
- Negative Temperature Coefficient: Reduces current as temperature rises, protecting LEDs from thermal runaway.
- No External Components Required: Can be designed as a high or low-side regulator without additional components.
- AEC-Q101 Qualified and PPAP Capable: Meets stringent automotive and industrial standards.
- Lead-Free, Halogen-Free/BFR Free, and RoHS Compliant: Environmentally friendly and compliant with regulatory standards.
Applications
- Automotive: Chevron side mirror markers, cluster, display & instrument backlighting, CHMSL, map light.
- AC Lighting Panels: Display signage, decorative lighting, channel lettering.
- Industrial and Commercial Signage: High and low side LED driver applications.
- Single LED String and Higher Current LED Strings: Can be used in series or parallel configurations to regulate current through LEDs.
- AC Applications with Full Wave Rectified AC: Can be used in AC circuits as shown in application notes AND8433/D and AND8492/D.
Q & A
- What is the maximum anode-cathode voltage the NSI50150ADT4G can handle?
The NSI50150ADT4G can handle up to 50 V of anode-cathode voltage.
- How is the current adjusted in the NSI50150ADT4G?
The current can be adjusted by attaching a resistor between the Radj pin and the cathode.
- What is the typical steady state current of the NSI50150ADT4G at 7.5 V?
The typical steady state current is 150 mA at 7.5 V.
- Is the NSI50150ADT4G compliant with automotive standards?
Yes, it is AEC-Q101 qualified and PPAP capable.
- What is the thermal resistance, junction-to-ambient, of the NSI50150ADT4G?
The thermal resistance, junction-to-ambient, is approximately 60 °C/W.
- Can the NSI50150ADT4G be used in AC applications?
Yes, it can be used with full wave rectified AC as described in application notes AND8433/D and AND8492/D.
- How does the negative temperature coefficient protect LEDs?
The negative temperature coefficient reduces the current as the temperature rises, protecting LEDs from thermal runaway.
- What is the maximum power dissipation of the NSI50150ADT4G?
The maximum power dissipation depends on the board design and layout but can handle up to 4.2 Watts.
- Is the NSI50150ADT4G environmentally friendly?
Yes, it is lead-free, halogen-free/BFR free, and RoHS compliant.
- Can the NSI50150ADT4G be used in high and low side configurations?
Yes, it can be designed as both a high or low side regulator without additional components.
