Περιγραφή
OZ8119LNOZ811 is DC/DC controller for the next generation of microprocessor power supplies, their peripherals and chipsets. OZ811 steps down the high battert voltage to low ouput voltages in the range of 0.5V to 2.75V. High efficiency, DC accuracy and excellent transient response make OZ811 the perfect choice for supplying low voltage CPU peripherals, chipset cores, and graphics processors. OZ811 is a constant ripple-current buck controller with powerful integrated drivers able to drive output currents up to 30A.Voltage Feed-Forward compensation assures high rejection of input voltage transient typically accuring when the AC adapter is plugged in or removed.Over Voltage Protection (OVP) acts when the output voltage exceeds the set voltage by more than 125mV. This protection condition is latched and initiates a ramp down of the output voltage.Under Voltage Protecction (UVP) acts when the output voltage falls below the set voltage by more than 133mV. This protection condition is latched and initiates a ramp down of the output voltage.After OVP or UVP are triggered, the ON/SKIP pin should be toggled or VDDA/VIN cycled to restart the circuit.The output is protected against overload by valley current type, cycle-by-cycle Over Current Protection (OCP) circuits.The Under Voltage LOCK Out circuit monitors both, VDDA and VIN and allows controller operation only if VDDA> 4.3V and VIN> 2.5V.The Power Good signal is high as long as the ouput voltage is within +125mV/-133mV of the set voltage. At startup the output voltage ramps up in a controlled manner with a typical slew rate of 2V/ms and at shutdown the output voltage is ramped down in a controlled manner with the same slew rate, recovering the energy stored on the output capacitor and extending battery life.
