This document describes the features and characteristics of the STCS2A 2A constant current LED driver, including input voltage range, output current, PWM dimming pin, shutdown pin, LED disconnection diagnostic, etc. The driver is designed for LED constant current supply and can be used with varying input voltages, providing benefits in terms of precision, integration, and reliability.
The STCS2A is a BiCMOS constant current source designed to provide a precise constant current starting from a varying input voltage source. It is 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 precision, integration, and reliability. The device sets the current with an external resistor up to 2 A with a ±10% precision.
| Supply voltage range | 4.5 to 40 V |
|---|---|
| Feedback voltage | 90 to 110 mV |
| Quiescent current (On Mode) | 450 to 750 µA |
| Dropout voltage (IO = 100 mA) | 0.12 to 0.16 V |
| Thermal Protection Shutdown temperature | 155 °C |
The current is set with an external sensing resistor connected to the FB pin, where the feedback voltage is 100 mV.
The maximum dimming frequency is limited by the minimum rise/fall time of the current, which is around 4 µs each.
When the enable pin is low, the device is completely off, reducing current consumption to less than 1 µA.