Light-emitting diode (LED) applications are spreading in consumer and automotive markets worldwide as a replacement for fluorescent lighting. This trend has penetrated the medical field and LEDs are now widely used for medical equipment such as in vitro diagnostic (IVD) systems, endoscopes, surgical operating rooms and so forth. In consumer and automotive applications, dimming LEDs generally use pulse width modulation (PWM) mode to save energy and make lighting comfortable for human eyes. There are countless LED drivers in the market with the PWM dimming function to meet market requirements. However, unlike consumer and automotive applications, medical applications often require an analog dimming design to avoid the banding effect and stroboscopic effect. The second issue is that medical applications can require high output current (about 40A) to drive large capacity LEDs but most LED drivers in the market cannot output large currents. This application note introduces several ways to use TI products to drive LEDs to meet the requirements of medical applications.