The PT16752 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 compensation, and soft-start timing. A unique spread-spectrum modulation (SSM) can reduce emission (EMI) at the switching frequency and its harmonics.

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 -40°C to 140°C and output voltage range of 3V to 65V.

This LED controller can independently modulate LED current using either analog or PWM dimming techniques (PT16752 only). Linear analog dimming response with 15:1 range is obtained by varying the voltage from 284mV to 2.272V across the high impedance analog adjust (IADJ) input. PWM dimming of LED current is achieved by modulating the DIM input pin with the desired duty cycle. PDRV gate driver output can be used to enable series FET dimming functionality to get over 1000:1 contrast ratio (fPWM=400Hz).

The PT16752 supports continuous LED status check through the current monitor (IMON) output. It also includes an open drain fault indicator output to indicate LED overcurrent, output overvoltage and output under-voltage conditions.