The PX3540 Graphics Processor Digital Multiphase
Controller provides core power for today’s high current
graphic processors by driving up to six synchronous-rectified
buck-converter channels in parallel. Interleaved timing of the
channels results in a higher ripple frequency, reducing input
and output ripple. With up to six phases, each capable of up
to 2 MHz operation, the PX3540 can be used to build DC-DC
converters that provide up to 200A with excellent efficiency,
low ripple, and the lowest component count.
The PX3540 utilizes digital technology to implement all
control functions, providing the ultimate in flexibility and
stability. The PX3540 incorporates an industry standard I2Cbus
serial interface for control and monitoring. Through the
serial interface, the power supply designer can quickly
optimize designs and monitor system performance. The
interface allows the PX3540 to provide digitized information
for real time system monitoring and control.
The PX3540 provides intelligent phase detection capability
allowing the system to operate under the condition of up to 2
(of 3) missing 12V supplies. Autonomous phase control
circuitry will drop phases due to current balance or 12V faults
and add phases when the 12V supply returns. An I2C based
user phase control mode is also provided.