STCS1APHR STMicroelectronics

STCS1A 1.5 A max constant current LED driver Features Up to 40 V input voltage Less than 0.5 V voltage overhead Up to 1.5 A output current PWM dimming pin Shutdown pin DFN8 (3 x 3 mm) Power SO-8 LED disconnection diagnostic Slope control with external cap Applications The current is set with external resistor up to 1.5 LED constant current supplying for varying A with a 10 % precision a dedicated pin allows input voltages implementing PWM dimming. An external Low voltage lighting capacitor allows setting the slope for the current rise from tens of microseconds to tens of Small appliances LED lighting milliseconds allowing reduction of EMI. Car LED lights An open-drain pin output provides information on load disconnection condition. Description The STCS1A is a BiCMOS constant current source designed to provide a precise constant current starting from a varying input voltage source. The main target is to replace discrete components solution for driving LEDs in low voltage applications such as 5 V, 12 V or 24 V giving benefits in terms of precision, integration and reliability. Table 1. Device summary Order codes Packages Packaging STCS1APUR DFN8 (3 x 3 mm) 3000 parts per reel STCS1APHR Power SO-8 2500 parts per reel July 2008 Rev 2 1/19 www.st.com 19Contents STCS1A Contents 1 Application diagram . 3 2 Pin configuration . 4 3 Maximum ratings 5 4 Electrical characteristics . 6 5 Timing . 7 6 Typical performance characteristics 8 7 Detail description 10 7.1 Current setting . 10 7.2 Enable . 10 7.3 PWM Dimming . 10 7.4 Diagnostic . 11 8 Application information . 12 8.1 Reverse polarity protection 12 8.2 Thermal considerations 12 9 Package mechanical data 14 10 Revision history . 18 2/19