LED driver operates in high-reliability applications

Taiwan Semiconductor has launched its TS19503 single-channel, continuous conduction, hysteretic mode converter for driving single or multiple LEDs. Featuring a 4.5-75-V input range and 2-A output, the TS19503 LED driver offers up to 97% efficiency and 2% accuracy over a range of external conditions and applications.

Click for a larger image. (Source: Taiwan Semiconductor)

With the hysteretic (bang-bang) control technique, the AEC-Q100-qualified TS19503 provides high accuracy and reduced external parts count, said the company. Target automotive applications include high and low beam headlights, daytime running lights, turn indicators, position indicator lights, fog lights, and ATV and four-wheel drive high-brightness lamps. The LED driver also is well suited for DC input industrial and medical applications where SELV and line isolation considerations are a concern.

Key specifications include 25 watts of output power, a low R_ds(on) internal MOSFET that enables up to 97% efficiency, a 1000:1 dimming range, and an adjustable frequency up to 1 MHz. The operating temperature range is -40°C to 125°C.

TS19503 LED driver block diagram (Source: Taiwan Semiconductor)

The TS19503 integrated LED driver is priced at $1.85 in OEM quantities. Lead times are 20 weeks, ARO, and samples are in stock from Digi-Key and Mouser. Taiwan Semiconductor offers several design resources, including an online video, users’ manual (PDF download), and design calculator tool (download).