PT16751
DESCRIPTION
The PT16751 is a Headlight LED controller for automotive with high accuracy peak current mode. The device implements a fixed-frequency peak current mode control technique with programmable switching frequency, slope pensation, and soft-start timing. The controller is designed to support a range of step-up or step-down driver topologies. It incorporates a high voltage (65V) rail-to-rail current sense amplifier that can directly measure LED current using a high-side series sense resistor. The amplifier is designed to achieve low input offset voltage and attain better than ±4% LED current accuracy over junction temperature range of 25°C to 140°C and output mon-mode voltage range of 3V to 60V.
This LED controller can independently modulate LED current using either analog or PWM dimming techniques. Linear analog dimming response with 15:1 range is obtained by varying the voltage from 140 m V to 2.25 V across the high impedance analog adjust (IADJ) input. PWM dimming of LED...
