The PT16750 is a Headlight LED controller for
automotive. The controller can support multiple DC-DC
topologies, such as Buck, Boost, SEPIC driver
topologies. The controller implements a
fixed-frequency peak current mode control technique,
integrated programmable switching frequency, slope
compensation, and soft-start timing. It incorporates a
high voltage (65 V) rail-to-rail current sense amplifier,
which can directly measure LED current using a
high-side series sense resistor. The amplifier is
designed to achieve better current accuracy than
±3%, in the junction temperature range of 25°C to
140°C and output common-mode voltage range
of 3 to 60 V.
LED current can be modulated using either analog
dimming or PWM dimming techniques. Adjust IADJ
input voltage from 140 mV to 2.25 V to realize linear
analog dimming. PWM dimming of LED current is
achieved by modulating the PWM input pin with the
desired duty cycle and frequency. DDRV gate driver
output can be used to enable series FET dimming
functionality to get over 1000:1 contrast ratio.
The PT16750 provides current monitor function, check
the LED status continuous through the IMON pin. This
allows for LED short circuit or open circuit detection
and protection. Additional fault protection features
include VCC UVLO, output OVP, switch cycle-by-cycle
current limit, and thermal protection.
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