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Isolated Auxiliary Power Supply 20-75W

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In the 20 to 75W power range, the need to meet increasingly tight efficiency and stand-by requirements for auxiliary power supplies has pushed the use of quasi-resonant topologies replacing more mainstream fly-back based designs.

We offer a range of power MOSFETs, diodes as well as primary PWM controllers together with an extensive range of hardware and software evaluation and development tools including reference designs to help design high-efficiency auxiliary switch mode power supplies (SMPS). 

isolated auxiliary smps 24v block diagram

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Application Notes (5 of 16)

Resource title
Latest update
AN3089 19 V - 65 W quasi-resonant flyback adapter using L6566B and TSM1014 2.0
13 Sep 2018
13 Sep 2018
AN3089 19 V - 65 W quasi-resonant flyback adapter using L6566B and TSM1014 2.0
AN5335 35W transition-mode flyback converter with ultra-low THD based on HVLED007 1.2
19 Dec 2019
19 Dec 2019
AN5335 35W transition-mode flyback converter with ultra-low THD based on HVLED007 1.2
AN5442 45W USB Type-Câ„¢ PD adapter board with controllers STCH03 QR flyback,SRK1001 adaptive synchronous rectifier and STUSB4761 USB Type-Câ„¢ PD 1.1
27 Mar 2020
27 Mar 2020
AN5442 45W USB Type-Câ„¢ PD adapter board with controllers STCH03 QR flyback,SRK1001 adaptive synchronous rectifier and STUSB4761 USB Type-Câ„¢ PD 1.1
AN1768 ADMISSIBLE AVALANCHE POWER OF SCHOTTKY DIODES 1.1
24 Mar 2020
24 Mar 2020
AN1768 ADMISSIBLE AVALANCHE POWER OF SCHOTTKY DIODES 1.1
AN2025 CONVERTER IMPROVEMENT USING SCHOTTKY RECTIFIER AVALANCHE SPECIFICATION 1.1
13 Sep 2018
13 Sep 2018
AN2025 CONVERTER IMPROVEMENT USING SCHOTTKY RECTIFIER AVALANCHE SPECIFICATION 1.1
AN604 Calculation of conduction losses in a power rectifier 3.2
24 Mar 2020
24 Mar 2020
AN604 Calculation of conduction losses in a power rectifier 3.2
AN4021 Calculation of reverse losses in a power diode 1.0
24 Mar 2020
24 Mar 2020
AN4021 Calculation of reverse losses in a power diode 1.0
AN4381 Current sharing in parallel diodes 1.0
24 Mar 2020
24 Mar 2020
AN4381 Current sharing in parallel diodes 1.0
AN4604 Evaluation board for the SEA01 constant voltage and current controller with online digital trimming 1.0
13 Sep 2018
13 Sep 2018
AN4604 Evaluation board for the SEA01 constant voltage and current controller with online digital trimming 1.0
AN1453 NEW FAMILY OF 150V POWER SCHOTTKY 1.1
24 Mar 2020
24 Mar 2020
AN1453 NEW FAMILY OF 150V POWER SCHOTTKY 1.1
AN5046 Printed circuit board assembly recommendations for STMicroelectronics PowerFLAT packages 4.0
24 Mar 2020
24 Mar 2020
AN5046 Printed circuit board assembly recommendations for STMicroelectronics PowerFLAT packages 4.0
AN5088 Rectifiers thermal management, handling and mounting recommendations 2.0
24 Mar 2020
24 Mar 2020
AN5088 Rectifiers thermal management, handling and mounting recommendations 2.0
AN533 SCRs, TRIACs, and AC switches, thermal management precautions for handling and mounting 3.6
24 Mar 2020
24 Mar 2020
AN533 SCRs, TRIACs, and AC switches, thermal management precautions for handling and mounting 3.6
AN443 SERIES OPERATION ON FAST RECTIFIERS 2.1
24 Mar 2020
24 Mar 2020
AN443 SERIES OPERATION ON FAST RECTIFIERS 2.1
AN1542 THE THERMAL RUNAWAY LAW IN SCHOTTKY USED IN OR-ING APPLICATION 1.1
13 Sep 2018
13 Sep 2018
AN1542 THE THERMAL RUNAWAY LAW IN SCHOTTKY USED IN OR-ING APPLICATION 1.1
AN869 Tj max limit of Schottky diodes 2.2
24 Mar 2020
24 Mar 2020
AN869 Tj max limit of Schottky diodes 2.2
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Presentations (1)

Resource title
Latest update
Primary side regulation controllers portfolio
21 Jun 2018
21 Jun 2018
Primary side regulation controllers portfolio

Flyers (4)

Resource title
Latest update
1200-1700V MDmesh K5 SERIES: Ideal for high input voltage auxiliary power supply systems 1.0
24 Nov 2020
24 Nov 2020
1200-1700V MDmesh K5 SERIES: Ideal for high input voltage auxiliary power supply systems 1.0
800-1050V MDmesh™ K5 ST’s first super-junction VHV MOSFET Series 1.0
06 Feb 2020
06 Feb 2020
800-1050V MDmesh™ K5 ST’s first super-junction VHV MOSFET Series 1.0
800-1700 V MDmesh K5 STPOWER MOSFET very high voltage super-junction series 1.0
06 Oct 2020
06 Oct 2020
800-1700 V MDmesh K5 STPOWER MOSFET very high voltage super-junction series 1.0
SOD128Flat power Schottky diodes for improved cost and space-savings 1.0
10 Sep 2018
10 Sep 2018
SOD128Flat power Schottky diodes for improved cost and space-savings 1.0

All tools & software

    • Part number
      		Status
      		Description
      		Type
      		Supplier

      ST Diode Finder
      Active

      Diode product finder application for Android and iOS

      		 Finders Apps ST

      ST Voltage Regulator Finder
      Active

      Linear and switching voltage regulators and voltage reference applications for smartphones and tablets

      		 Finders Apps ST
      ST Diode Finder

      Description:

      Diode product finder application for Android and iOS
      ST Voltage Regulator Finder

      Description:

      Linear and switching voltage regulators and voltage reference applications for smartphones and tablets

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.