ZHCSD61L July 2012 – May 2019 LP8556
PRODUCTION DATA.
LP8556 is a white LED driver featuring an asynchronous boost converter and six high-precision current sinks that can be controlled by a PWM signal or an I2C master.
The boost converter uses adaptive output voltage control for setting the optimal LED driver voltages as high as 43 V. This feature minimizes the power consumption by adjusting the voltage to the lowest sufficient level under all conditions. The converter can operate at three switching frequencies: 312, 625, and 1250 kHz pre-configured via EPROM or can be set through an external resistor. Programmable slew rate control and spread spectrum scheme minimize switching noise and improve EMI performance.
LED current sinks can be set with the PWM dimming resolution of up to 15 bits. Proprietary adaptive dimming mode allows higher system power saving. In addition, phase shifted LED PWM dimming allows reduced audible noise and smaller boost output capacitors.
The LP8556 device has a full set of safety features that ensure robust operation of the device and external components. The set consists of input undervoltage lockout, thermal shutdown, overcurrent protection, up to six levels of overvoltage protection, LED open, and short detection.