IRLR3110ZTRPBF
Infineon
For this application, we chose the Infineon® IRLR3110ZTRPbF 100V, 63A n-channel MOSFET as the primary MOSFET.
Reference DesignAnalog
MAXREFDES1227: 24W Miniature Isolated DCM Flyback Converter
12V output isolated power supply using the MAX17596 DCM flyback controller, delivering 2A load current with 17V to 60V input range.
Overview
The MAXREFDES1227 is a miniature 24W isolated DC-DC power supply providing a 12V output at up to 2A load current. The design employs the MAX17596 peak-current-mode controller in a discontinuous-conduction mode (DCM) flyback topology running at 125kHz. While the controller natively supports up to 36V, this design uses an extra transformer bias winding to extend the operating input range to 60V. It features 1500V RMS galvanic isolation between primary and secondary stages, with an optocoupler for secondary-side voltage regulation. The document provides full design equations, component selection criteria for the MOSFET and transformer, and performance specifications including a peak efficiency of 88.4%.
Use Cases
- Industrial automation power modules
- Isolated communication interfaces
- PLC I/O power supplies
- Process control equipment
- Distributed power architectures
Topics
MAX17596
Isolated Power Supply
DCM Flyback
DC-DC Converter
12V Output
24W Power
Galvanic Isolation
Peak-Current-Mode Control
750318221
MAXREFDES1227
Referenced Parts
TL431AQDBZRQ1
Texas Instruments
In this design, we selected a Texas Instruments® TL431AQDBZRQ1 2.5V shunt regulator.
SMD110PL
Micro Commercial Components
We selected the Micro Commercial Components® SMD110PL 100V, 1A diode as the snubber diode.
STPS30SM100SG
STMicroelectronics
We selected the STMicroelectronics® STPS30SM100SG 100V, 30A ultra-fast recovery diode as a secondary rectifier diode.
750318221
Würth Electronik
A customized transformer 750318221 from Würth Electronik is used in this design.
MAX17596
Maxim Integrated
The design employs the MAX17596 peak-current-mode controller in discontinuous-conduction mode (DCM) flyback topology running at 125kHz.
| IRLR3110ZTRPBF | Infineon | For this application, we chose the Infineon® IRLR3110ZTRPbF 100V, 63A n-channel MOSFET as the primary MOSFET. |
| TL431AQDBZRQ1 | Texas Instruments | In this design, we selected a Texas Instruments® TL431AQDBZRQ1 2.5V shunt regulator. |
| SMD110PL | Micro Commercial Components | We selected the Micro Commercial Components® SMD110PL 100V, 1A diode as the snubber diode. |
| STPS30SM100SG | STMicroelectronics | We selected the STMicroelectronics® STPS30SM100SG 100V, 30A ultra-fast recovery diode as a secondary rectifier diode. |
| 750318221 | Würth Electronik | A customized transformer 750318221 from Würth Electronik is used in this design. |
| MAX17596 | Maxim Integrated | The design employs the MAX17596 peak-current-mode controller in discontinuous-conduction mode (DCM) flyback topology running at 125kHz. |