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Energy Saving Products
101 N.Sepulveda Blvd, EL Segundo 90245 California, USA
IRAC27951-220W
IRS27951 Evaluation Board
User Guide
Rev. 4.0
5/22/2010
International Rectifier
Page 1 of 16
PROPRIETARY INFORMATION - This document and the information contained therein are proprietary and are not to be reproduced, used or disclosed
INTERNATIONAL RECTIFIER.
to others for manufacture or any other purpose except as specifically authorized in writing by
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Summary of Contents for International Rectifier IRS27951
- Page 1 Energy Saving Products 101 N.Sepulveda Blvd, EL Segundo 90245 California, USA IRAC27951-220W IRS27951 Evaluation Board User Guide Rev. 4.0 5/22/2010 International Rectifier Page 1 of 16 PROPRIETARY INFORMATION - This document and the information contained therein are proprietary and are not to be reproduced, used or disclosed INTERNATIONAL RECTIFIER.
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Page 2: Table Of Contents
3.6 Bill of Materials ........................8 EVALUATION BOARD OPERATING PROCEDURE ..............9 4.1 Load Connection........................9 4.2 AC/DC Input ......................... 10 4.3 IRS27951 DC Supply Voltage ....................10 4.4 Power-up Sequence ......................10 SYSTEM PERFORMANCE CHARACTERIZATION ..............11 5.1 Steady-State and Start-up Waveforms ................. 11 5.2 Short Circuit Protection ...................... -
Page 3: Introduction
MOSFET, the IRS2795 eliminates the need for an additional current sensing resistor, filter and current-sensing pin. This protection feature is latched and the thresholds are fixed at 2V for IRS27951 and 3V for IRS27952. Finally, the controller IC also features a micro power startup current (I <100µA) and a user initiated sleep... -
Page 4: Evaluation Board Specifications
The downstream converter is a multi-resonant half bridge LLC converter whose control is implemented with the IRS27951 (U1) controller HVIC. The controller drives the two half-bridge MOSFETs with a 50 percent fixed duty cycle with dead-time, changing the frequency according to the feedback signal in order to regulate the output voltages against load and input voltage variations. -
Page 5: Schematic
Vbus Rstart1 Rstart2 Rstart3 Rvcc V30100S 270k 270k 270k STF13NM50N 1N4148 1N4148 3.3uH/10A MURS160 GBU4J-BPMS-ND Cout1 Cout2 Cout3 Cout4 Rgs1 RNTC 265VAC Cout5 Rprl1 t° + C4 220nF Jumper 0.33uF/630V CT/SD 22nF/1kV 270uF/450V Rdisch CVcc1 RMAX Header 6 510K STF13NM50N V30100S Header 3 CVcc2... -
Page 6: Evaluation Board Picture
3.4 Board Component Placement Figure 3 – Evaluation Board Component Placement Rev. 4.0 5/22/2010 International Rectifier Page 6 of 16 PROPRIETARY INFORMATION - This document and the information contained therein are proprietary and are not to be reproduced, used or disclosed INTERNATIONAL RECTIFIER. -
Page 7: Board Pcb Layout
3.5 Board PCB Layout Figure 4 - Board Bottom Layer Copper Rev. 4.0 5/22/2010 International Rectifier Page 7 of 16 PROPRIETARY INFORMATION - This document and the information contained therein are proprietary and are not to be reproduced, used or disclosed INTERNATIONAL RECTIFIER. -
Page 8: Bill Of Materials
DIGIKEY RHM22. 0FCT-ND Rx1, Rx2 1206 SMD Film RED 1/4W 1% DIGIKEY 311-4.70FRCT-ND Resonant Power Transformer ETD49 PRECISION INC 019-4974-00R IRS27951 Control IC IRS27951S Phot ocoupler TRANS-OUT 4-DIP TLP621 DIGIKEY TLP621FT-ND Programmable Voltage Regulator SOT23-3 TL431 DIGIKEY 296-17328-1-ND Jumper for Primary Current Sensing Loop AWG20 Rev. -
Page 9: Evaluation Board Operating Procedure
A minimum load has been added on both the output rails to ensure tight voltage regulation for both output rails from no load to full load. Rev. 4.0 5/22/2010 International Rectifier Page 9 of 16 PROPRIETARY INFORMATION - This document and the information contained therein are proprietary and are not to be reproduced, used or disclosed INTERNATIONAL RECTIFIER. -
Page 10: Ac/Dc Input
4.3 IRS27951 DC Supply Voltage The board is self-supplied by startup circuit and auxiliary winding of transformer. The startup circuit starts to work once AC or DC input voltage applies to the board. -
Page 11: System Performance Characterization
Full Load Start-up No Load Start-up Rev. 4.0 5/22/2010 International Rectifier Page 11 of 16 PROPRIETARY INFORMATION - This document and the information contained therein are proprietary and are not to be reproduced, used or disclosed INTERNATIONAL RECTIFIER. to others for manufacture or any other purpose except as specifically authorized in writing by... -
Page 12: Short Circuit Protection
5.2 Short Circuit Protection IRS27951 uses high-voltage technology to sense the current in the low-side MOSFET. The voltage at the VS node is sensed when the low-side device is turned ON and the system shuts off when a load short-circuit condition is sensed (i.e. -
Page 13: Dynamic Load Response & Output Voltage Regulation
Iout (A) Figure 7 - Output voltage regulation plot Rev. 4.0 5/22/2010 International Rectifier Page 13 of 16 PROPRIETARY INFORMATION - This document and the information contained therein are proprietary and are not to be reproduced, used or disclosed INTERNATIONAL RECTIFIER. -
Page 14: User Initiated Sleep Mode
5.4 User Initiated SLEEP Mode The CT/SD pin of IRS27951 can be used to disable the IC and enter sleep mode in which the IC power consumption is highly minimized. The IC enters this mode when the CT/SD pin is externally pulled to COM. -
Page 15: Thermal Data
90.0 110.0 130.0 150.0 170.0 190.0 210.0 Output Power (W) Figure 8 - Efficiency plot 5.6 Thermal Data The thermal performance of IRS27951 demo board is tested at 400Vdc input and 220W full load under room temperature. Part Case Temperature (°C) MOSFET Q1 44.5... -
Page 16: Electrical Diagram
Sec. D LITZ - dia. 0.20x40 Rev. 4.0 5/22/2010 International Rectifier Page 16 of 16 PROPRIETARY INFORMATION - This document and the information contained therein are proprietary and are not to be reproduced, used or disclosed INTERNATIONAL RECTIFIER. to others for manufacture or any other purpose except as specifically authorized in writing by...
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