Overview
The NSI50350ADT4G is a linear constant current regulator (CCR) designed by onsemi to provide a cost-effective solution for regulating current in LEDs. This device is based on Self-Biased Transistor (SBT) technology and is capable of regulating current over a wide voltage range. It features a negative temperature coefficient to protect LEDs from thermal runaway at extreme voltages and currents. The CCR turns on immediately and reaches 20% of regulation with only 0.5 V across it, requiring no external components. It is suitable for high or low-side regulator configurations and is qualified to AEC-Q101 standard and UL94-V0 Certified, making it robust for various applications including automotive, industrial, and commercial signage.
Key Specifications
| Characteristic | Symbol | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| Anode-Cathode Voltage | Vak | 50 | V | ||
| Reverse Voltage | VR | 500 mV | |||
| Operating and Storage Junction Temperature Range | TJ, Tstg | -55 | +175 | °C | |
| Steady State Current @ Vak = 7.5 V | Ireg(SS) | 315 | 350 | 385 | mA |
| Voltage Overhead | Voverhead | 1.8 | V | ||
| Pulse Current @ Vak = 7.5 V | Ireg(P) | 376.5 | 424 | 474.5 | mA |
| Thermal Resistance, Junction-to-Ambient | RθJA | 23.5 - 36.2 | °C/W |
Key Features
- Robust Power Package: 11 W, capable of handling high power applications.
- Wide Operating Voltage Range: Supports a broad range of voltages, making it versatile for various applications.
- Immediate Turn-On: Turns on immediately and reaches 20% of regulation with only 0.5 V across it.
- Voltage Surge Suppressing: Protects LEDs from voltage surges common in automotive, industrial, and commercial signage applications.
- SBT (Self-Biased Transistor) Technology: Regulates current over a wide voltage range.
- Negative Temperature Coefficient: Reduces current as temperature rises to protect LEDs from thermal runaway.
- AEC-Q101 Qualified and PPAP Capable: Meets automotive standards for reliability and quality.
- UL94-V0 Certified: Ensures high safety standards for flammability.
- Pb-Free, Halogen Free/BFR Free, and RoHS Compliant: Environmentally friendly and compliant with regulatory standards.
Applications
- Automotive: Cluster and central console backlighting, navigation/audio systems, vanity mirror light, car door puddle light, ambience lighting, CHMSL, turn signals, side repeaters, tail lamps, brake lighting, and trailer lights.
- Display & Signage: Channel letters, display backlighting, neon bulb replacements, LED stripes & modules.
- Architectural Lighting: Decorative, task, exterior, landscape, and under-counter lighting.
- Computing and Industrial: Indicator lamps and backlights.
Q & A
- What is the maximum anode-cathode voltage rating for the NSI50350ADT4G?
The maximum anode-cathode voltage rating is 50 V.
- What is the typical steady-state current of the NSI50350ADT4G at 7.5 V?
The typical steady-state current is 350 mA.
- Does the NSI50350ADT4G require any external components to operate?
No, it does not require any external components to operate as a high or low-side regulator.
- What is the thermal resistance, junction-to-ambient, for the NSI50350ADT4G?
The thermal resistance, junction-to-ambient, ranges from 23.5 to 36.2 °C/W depending on the PCB configuration.
- Is the NSI50350ADT4G qualified for automotive applications?
Yes, it is AEC-Q101 qualified and PPAP capable, making it suitable for automotive applications.
- What is the maximum junction temperature for the NSI50350ADT4G?
The maximum junction temperature is 175°C.
- Can the NSI50350ADT4G 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 NSI50350ADT4G protect LEDs from thermal runaway?
The device has a negative temperature coefficient, which reduces the current as the temperature rises, protecting the LEDs from thermal runaway.
- Is the NSI50350ADT4G environmentally friendly?
Yes, it is Pb-Free, Halogen Free/BFR Free, and RoHS Compliant.
- What package type is the NSI50350ADT4G available in?
The NSI50350ADT4G is available in the TO-252-3 (DPAK) package.
