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UCD9240

Features: • Controls up to 8 power stages and up to 4 voltage feedback control loops.• Supports PMBus version 1.1.• Flexible configuration, device can control: o Four single or dual power stages, o Two 4-phase power stages, or o One 2,4,6, or 8-phase power stage.• Supports ...

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UCD9240: Features: • Controls up to 8 power stages and up to 4 voltage feedback control loops.• Supports PMBus version 1.1.• Flexible configuration, device can control: o Four single or dua...

UCD9240 Data Sheet

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Part Number:
UCD9240
Supply Ability:
5000

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  • 1~5000
  • Unit Price
  • Negotiable
  • Processing time
  • 15 Days
Total Cost: $ 0.00

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Product Details

Description



Features:

• Controls up to 8 power stages and up to 4 voltage feedback control loops.
• Supports PMBus version 1.1.
• Flexible configuration, device can control:
  o Four single or dual power stages,
  o Two 4-phase power stages, or
  o One 2,4,6, or 8-phase power stage.
• Supports switching frequencies up to 2MHz.
• Supports conversion ratio of 12 to 1 at 2MHz with 250 psec duty-cycle resolution.
• +/-1mV feed-back resolution.
• Hardware accelerated digital 3-pole/3-zero compensator.
• Internal regulator drives an external pass element, giving a wide supply voltage range.
• 12-bit digital monitoring of power supplyparameters, including:
  o Vin,
  o Vout, each rail,
  o Iout, each power stage (phase),
  o External Temperature, each stage.
• Multiple levels of current fault protection:
  o External current fault inputs,
  o Fast analog comparators monitor current sense voltage,
  o Digital current sense monitor of average current.
• Eight Synchronous Rectifier Enable (SRE) outputs.
• Able to synchronize PWM clocks betweenmultiple UCD9240 devices.
• Enhanced non-volatile memory with ECC
• Programmable soft start and soft stop rampsunder closed loop control.
• Supports multiple soft-start and soft-stop configuration including pre-bias start-up.
• Supports voltage tracking.
• Supports current sharing on multi-phasepower stages.
• Supports phase shedding on multi-phase power stages based on average current.
• Programmable fan control outputs.
• Programmable margining and sequencing.
• Power+ Designer, a full featured PC based design tool to simulate, configure, andmonitor power supply performance.


Application

• Industrial / ATE
• Networking Equipment
• Servers
• Storage Systems
• Telecommunications Equipment


Specifications

Voltage applied at V33D to DVss                        -0.3 V to 3.6 V
Voltage applied at V33A to AVss                        -0.3 V to 3.6 V
Voltage applied to any pin (see NOTE)  -0.3 V to V33D + 0.3 V
Storage temperature, TSTG                                 -40C to 150C


Description

The UCD9240 is a digital synchronous buck PWM controller that can control up to 8 power stages in multi-phase configuration or up to 4 feedback outputs with two phases per output. This device provides enhanced configurability and control for point of load (POL) applications. The device is configured via PMBus with the Power+ Designer GUI.

The switching frequency, output configuration and feedback compensation are programmed through the Power+ Designer. This allows the UCD9240 to support multiple converter arrangements and to meet dynamic converter performance for a broad range of POL applications.

Each high speed digital control loop has a dedicated 3-pole/3-zero compensator and 250ps PWMs. This architecture enables wide input to output voltage
conversion ratio's at switching frequency of up to 2MHz.

Additionally, the UCD9240 is able to monitor and manage power supply operating conditions and report the status to the host system through thePMBus. The management parameters are configurable through the Power+ Designer. The design tool allows the power supply designer to easily configure the control loop characteristics and generate the expected performance by displaying Bode plots for each controlled power stage. On multi-phase power stage outputs, the UCD9240 incorporates current balancing. The average current in each phase is monitored and the duty cycle for each phase adjusted to balance the average current.

In addition, the UCD9240 supports "shedding" one or more phases (ganged power stages) commanded through PMBus or by average current demand. When a phase is dropped or added the UCD9240 automatically adjusts the phase of each PWM output to minimize output ripple as well as any needed change in loop compensation.




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