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What is Digital Power?

Digital power is an energy conversion system in which digital control techniques are applied to power management applications where monitoring, communication and supervisor functions come as an extension of the main digital control loop or in conjunction of the main analog control loop.

From low- to high-power applications, digital power management and control, mainly applied to Switched-Mode Power Supplies (SMPS), increases power density, enables faster control loops, better system-level integration and design flexibility, improves system-level reliability, monitoring and safety, and helps reduce time-to-market. Overall, digital power control enhances system efficiency.

ST's offering

ST's extensive digital power portfolio meets the requirements of digital power designs. Our offering includes MCUs specifically designed to address digital power conversion applications with a full digital control approach, as well as ASICs and ASSPs addressing semi-digital (mixed analog-digital signal) control and digital controllers with a dedicated ROM memory for software control algorithms.

ST's power discretes optimized for soft switching resonant and hard switching converters maximize system efficiency for low-power and high-power applications.

ST's digital power solutions can be implemented using dedicated evaluation boards, reference designs,  technical documentations, and eDesignSuite software configurator and design tools.

Digital Power vs Analog Power

    • Digital power

      • Immune to environmental conditions (temperature, drift, etc)
      • SW programmable and flexible solution (i.e. one design for different solutions)
      • Advanced control possible (non-linear, multi variable)
      • Failure prediction (integration of communication / monitoring functions and control algorithm in the same IC)

      Analog power

      • High bandwidth and resolution
      • Cost-efficient solution
      • Well-known theory
    • Digital power

      • Bandwidth limitations (sampling loop)
      • PWM frequency and resolution limits (not for HRTIMER)
      • Quantization issues
      • Bias power supplies, interface requirements

      Analog power

      • Component drift / aging / tolerance
      • Hardware-based: lack of flexibility
      • Limited to classical control theory only
      • No smart control over performance
      • Limited number of power stages / topologies
    • Digital power

      • External gate driver required
      • Auxiliary supply with different voltages:
        • 3.3 and 5 V for MCUs (impacting on level translation of external sensing)
        • 5 to 20 V for gate drivers (also negative)

      Analog power

      • Gate driver usually implemented in IC
      • Power can directly be supplied from HV startup, rather than from auxiliary winding after startup
00 Files selected for download

Technical Documentation

    • Description Version Size Action
      AN5118
      12 V – 150 W power supply based on STNRG011 digital combo and SRK2001 adaptive synchronous rectifier controller
      1.1
      5.26 MB
      PDF
      AN4656
      Bootloading procedure for STLUX™ and STNRG™ digital controllers
      3.1
      588.34 KB
      PDF
      AN5497
      Buck current mode with the B-G474E-DPOW1 Discovery kit
      1.0
      9.96 MB
      PDF
      AN5496
      Buck voltage mode with the B-G474E-DPOW1 Discovery kit
      1.0
      8.83 MB
      PDF
      AN5119
      How to design an application from draft with STNRG011
      1.1
      343.91 KB
      PDF
      AN5118

      12 V – 150 W power supply based on STNRG011 digital combo and SRK2001 adaptive synchronous rectifier controller

      AN4656

      Bootloading procedure for STLUX™ and STNRG™ digital controllers

      AN5497

      Buck current mode with the B-G474E-DPOW1 Discovery kit

      AN5496

      Buck voltage mode with the B-G474E-DPOW1 Discovery kit

      AN5119

      How to design an application from draft with STNRG011

Publications and Collaterals

    • Description Version Size Action
      STNRG011 - Digital multi-mode PFC and LLC resonant half-bridge controller 04.2018
      960.71 KB
      PDF
      STNRGPF01 - Shift into high gear with digital power 03.2017
      714.28 KB
      PDF
      eDesignSuite-The smart way to design your application 1.0
      842.88 KB
      PDF

      STNRG011 - Digital multi-mode PFC and LLC resonant half-bridge controller

      STNRGPF01 - Shift into high gear with digital power

      eDesignSuite-The smart way to design your application

    • Description Version Size Action
      Digital Controller Eases Design Of Interleaved PFC For Multi-kilowatt Converters by Rosario Attanasio, Giuseppe Di Caro, Sebastiano Messina, and Marco Torrisi, STMicroelectronics, Schaumburg, Ill and Catania, Italy 1.0
      1.96 MB
      PDF

      Digital Controller Eases Design Of Interleaved PFC For Multi-kilowatt Converters by Rosario Attanasio, Giuseppe Di Caro, Sebastiano Messina, and Marco Torrisi, STMicroelectronics, Schaumburg, Ill and Catania, Italy

eDesignSuite

Converter

Input

V This option is required. And must be less than or equal to Volt. Max [V]
V This option is required. And must be greater than or equal to Volt. Min [V]

Output Power

V This option is required and must be a number.
A This option is required and must be a number.