IPD80R2K4P7
Infineon
the 800V 2.5A n-channel MOSFET IPD80R2K4P7 from Infineon® is selected as the primary MOSFET.
Design DocumentAnalog
MAXREFDES1182: 3.5W 3.3V Offline DCM Flyback Converter Reference Design
Reference design for a 3.5W offline DCM flyback converter using the MAX17595 controller, delivering 3.3V at 1.06A from a 176V to 284V AC input range.
Overview
This design document details the MAXREFDES1182, an offline flyback converter operating in discontinuous conduction mode (DCM). The design utilizes the Analog Devices MAX17595 peak-current-mode controller to convert a wide AC input (176V to 284V) into a regulated 3.3V DC output at 1.06A. It features secondary-side synchronous rectification using the MAX17606 MOSFET driver and a customized Wurth Elektronik transformer. The system operates at a 125kHz switching frequency with a peak efficiency of 82%. Key features include programmable frequency dithering for low EMI, soft-start, input overvoltage protection, and hiccup-mode overcurrent protection.
Use Cases
- Isolated AC-DC power supplies
- Telecom DC-DC power modules
- Industrial control systems
- Universal input offline converters
Topics
MAX17595
MAX17606
Flyback Converter
DCM
Offline Power Supply
AC-DC Converter
Synchronous Rectification
Reference Design
Power Management
Referenced Parts
S1KL
Taiwan Semiconductor
An 800V, 1A diode S1KL from Taiwan Semiconductor is selected as the snubber diode for this design.
SIR836DP-T1-GE3
Vishay
a 40V, 19A, MOSFET SIR836DP-T1-GE3 from Vishay® is selected as a secondary MOSFET.
MAX17595
Analog
The MAX17595 is a peak-current-mode controller for designing wide input-voltage flyback regulators.
MAX17606
Analog
Here we are using synchronous rectification using the MAX17606 MOSFET driver at the secondary side.
TLV431BFTA
Diodes Inc.
In this design a 1.24V, 0.5% shunt regulator TLV431BFTA from Diodes Inc. is selected.
750317612
Wurth Elektronik
A customized transformer 750317612 from Würth Electronik is used in this design.
| IPD80R2K4P7 | Infineon | the 800V 2.5A n-channel MOSFET IPD80R2K4P7 from Infineon® is selected as the primary MOSFET. |
| S1KL | Taiwan Semiconductor | An 800V, 1A diode S1KL from Taiwan Semiconductor is selected as the snubber diode for this design. |
| SIR836DP-T1-GE3 | Vishay | a 40V, 19A, MOSFET SIR836DP-T1-GE3 from Vishay® is selected as a secondary MOSFET. |
| MAX17595 | Analog | The MAX17595 is a peak-current-mode controller for designing wide input-voltage flyback regulators. |
| MAX17606 | Analog | Here we are using synchronous rectification using the MAX17606 MOSFET driver at the secondary side. |
| TLV431BFTA | Diodes Inc. | In this design a 1.24V, 0.5% shunt regulator TLV431BFTA from Diodes Inc. is selected. |
| 750317612 | Wurth Elektronik | A customized transformer 750317612 from Würth Electronik is used in this design. |