Обзор

Особенности и преимущества

  • Controls supply voltages from 16 V to 80V
  • True High Voltage (80V) IPC-9592 compliant packaging
  • 500 ns response time to short circuit
  • FET energy monitoring for adaptable FET SOA protection
  • Gate boost mode for fast recovery from shutdown events
  • Programmable random start mode to stagger poweron
  • Disable PWRGD on detection of FET fault
  • Remote temperature sensing with programmable warning and shutdown thresholds
  • Programmable 10mV  to 30 mV system current/power limit
  • ±1% accurate current measurement with 12-bit ADC
  • I, VIN, VOUT, temperature, power, energy telemetry
  • Programmable startup current limit
  • Programmable linear output voltage soft start
  • 1% accurate UV and OV thresholds
  • Programmable 0-20 sec auto restart function
  • Two programmable GPIO pins
  • Reports power and energy consumption
  • Peak detect registers for current, voltage, and power
  • PMBus fast mode compliant interface
  • 48-lead 7x8 LFCSP

Подробнее о продукте

The ADM1272 is a hot swap controller that allows a circuit board to be removed from or inserted into a live backplane. It also features current, voltage, and power readback via an integrated 12-bit analog-to-digital converter (ADC), accessed using a PMBus interface. This device is able to standoff up to 120V which makes it very robust in surviving surges and transients commonly associated with high voltage systems, usually clamped using protection devices such as TVS, which can often exceed 100V.

The load current is measured using an internal current sense amplifier that measures the voltage across a sense resistor in the power path via the SENSE+ and SENSE− pins. A default current limit sense voltage of 30 mV is set, but this limit can be adjusted down, if required, using a resistor divider network from the VCAP regulator output voltage to the ISET pin. An additional resistor can also be placed from ISET to Vin (or Vout) to allow the current limit to track inversely with the rail voltage. This allows a quasi “system power” limit to be used.

The ADM1272 limits the current through the sense resistor by controlling the gate voltage of an external N-channel FET in the power path. The sense voltage, and therefore the load current, is maintained below the preset maximum. The ADM1272 protects the external FET by monitoring and limiting the energy transfer through the FET while the current is being controlled. This energy-limit is set by the choice of capacitor and resistors connected to the EFAULT pin for fault protection mode and ESTART pin during startup. Therefore different energy limits can be set for startup and normal fault conditions. During startup, inrush currents are maintained very low and different areas of the SOA curve are of interest, while at fault conditions the currents can be much higher. The controller uses the VDS voltage across the FET to set the current profile of the EFAULT/ESTART pins and therefore how much energy is allowed to be transferred in the FET. This will ensure the MOSFET remains within the SOA limits. An optional capacitor can be used on DVDT pin to set the output voltage ramp rate, if required. In case of a short-circuit event, a fast internal overcurrent detector responds in hundreds of ns and signals the gate to shut down. A 1500 mA pull-down device ensures a fast FET response. The gate will then recover control within 50us to ensure minimal disruption during conditions such as line steps and surges. The ADM1272 features overvoltage (OV) and undervoltage (UV) protection, programmed using external resistor dividers on the UVH, UVL and OV pins. The use of two pins for UV allow independent accurate rising and falling thresholds. The PWRGD output pin can be used to signal when the output voltage is valid and the gate is sufficiently enhanced. The validity of VOUT is determined using the PWGIN pin.

The 12-bit ADC can measure the voltage across the sense resistor, the supply voltage on the SENSE+ pin, the output voltage and the temperature using an external NPN/PNP device. A PMBus interface allows a controller to read data from the ADC. As many as 16 unique I2C addresses can be selected, depending on how the two ADR pins are connected. The ADM1272 will be available in a custom 48-lead LFCSP (7mm x 8mm) with a pinstrap mode that allows the device to be configured for automatic retry or latch-off when an overcurrent fault occurs.

Applications

  • +48V / +54V systems
  • Servers
  • Power monitoring and control/power budgeting
  • Central office equipment
  • Telecommunication and data communication equipment
  • Industrial Applications 

Статус продукта icon-recommended Рекомендовано для новых разработок

Данный продукт выпущен на рынок. Техническое описание содержит окончательные характеристики и рабочие параметры продукта. Для новых разработок ADI рекомендует применение данных продуктов.

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