The AIC2517 buck constant-current high brightness LED driver, with an internal switch, provides a cost effective solution for driving single or multiple LEDs in series up to a total of 1.2A output current. Applications cover indicators and signage lighting, automotive lighting, LED lighting (such as MR16 and other LED illumination application) with input voltages ranging from 7V to 36V. Depending upon supply voltage and external components, it can provide up to 25W of output power. Various dimming method available on demand, includes DC dimming and PWM dimming for design flexibility to add customer specific features. An on-chip LED protection circuit also allows output current to be reduced linearly above a predetermined threshold temperature using an external thermistor at the TH pin.
The operation of AIC2517 is based on a hysteretic PFM control scheme resulting in the operation frequency varies with different load and input voltage. A hysteretic PFM control scheme ensures excellent input-supply rejection and fast response during load transients and PWM dimming. It is allowing for small PCB size, competitive cost/ performance, high power conversion efficiency and maximum LED brightness/reliability.
The AIC2517 operates over -40°C to +85°C automotive temperature range and is available in SOT23-6 and SOP-8 exposed pad package.
