Overview
The STCS2ASPR, produced by STMicroelectronics, is a BiCMOS constant current source designed to provide a precise constant current from a varying input voltage source. It is primarily intended to replace discrete component solutions for driving LEDs in low voltage applications such as 5 V, 12 V, or 24 V, offering benefits in terms of precision, integration, and reliability. The device supports up to 2 A output current and operates within an input voltage range of 4.5 V to 40 V, making it suitable for various LED lighting applications.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Input Voltage Range | 4.5 to 40 | V |
| Output Current Range | 1 to 2000 | mA |
| Voltage Overhead | V | |
| Feedback Voltage | 90 to 110 | mV |
| Quiescent Current (On Mode) | 450 to 750 | µA |
| Quiescent Current (Shutdown Mode) | 1 to 3 | µA |
| Dropout Voltage (VDRAIN to GND) | 0.12 to 0.9 | V |
| Junction Temperature Range | -40 to 150 | °C |
| Storage Temperature Range | -55 to 150 | °C |
| Thermal Resistance Junction-Ambient | 50 to 12 | °C/W |
Key Features
- Slope control with external capacitor to reduce EMI and avoid current spikes at turn-on.
- LED disconnection diagnostic via an open-drain pin output.
- PWM dimming pin for adjustable brightness control.
- Shutdown pin for power management.
- Less than 0.5 V voltage overhead.
- Up to 2 A output current with ±10% precision set by an external resistor.
Applications
- LED constant current supplying for varying input voltages.
- Low voltage lighting applications.
- Small appliances LED lighting.
- Car LED lights.
Q & A
- What is the input voltage range of the STCS2ASPR? The input voltage range is from 4.5 V to 40 V.
- What is the maximum output current of the STCS2ASPR? The maximum output current is up to 2 A.
- How is the current set in the STCS2ASPR? The current is set with an external sensing resistor connected to the FB pin, with a feedback voltage of 100 mV.
- Does the STCS2ASPR support PWM dimming? Yes, it has a dedicated PWM dimming pin.
- How does the STCS2ASPR handle LED disconnection? It provides an open-drain pin output for LED disconnection diagnostic.
- What is the quiescent current in shutdown mode? The quiescent current in shutdown mode is between 1 to 3 µA.
- What is the thermal resistance junction-ambient of the STCS2ASPR? The thermal resistance junction-ambient ranges from 50 to 12 °C/W depending on the configuration.
- What is the storage temperature range of the STCS2ASPR? The storage temperature range is from -55 to 150 °C.
- How can EMI be reduced in the STCS2ASPR? EMI can be reduced by using an external capacitor for slope control.
- What are some common applications of the STCS2ASPR? Common applications include low voltage lighting, small appliances LED lighting, and car LED lights.
