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reference designTPS23731 | Demoboard PMP22806

Texas Instruments TPS23731 | Demoboard PMP22806

Class 4 PoE PD isolated-flyback converter (12 V, 2.1 A) primary side regulation reference design

Overview

TopologyLAN / POE
Input voltage52.5-57 V
Output 112 V / 2.1 A

Description

This reference design implements a Power over Ethernet (PoE) Power Device (PD) flyback converter with 12-V and 2.1-A output. TPS23731 PD and PWM controller provides all necessary functions to implement the PoE PD control and PWM control for the flyback converter. TPS23731 uses primary side regulation (PSR) that eliminates the need for optocoupler feedback.

Features

  • Combined PD and PWM controller
  • Primary side regulation (no optocoupler)
  • Optional 48-V adapter input
  • Frequency dithering for improved EMI

Typical applications

  • Redundant Power Feeds or Power Sharing
  • Barcode reader, WLAN, Wi-Fi® access point, IP network camera
  • IP network camera

More information

Products

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Order Code
Data­sheet
Simu­lation
Downloads
Status
Product series
C
Tol. C
Size
DF(%)
RISO
Ceramic Type
L(mm)
W(mm)
H(mm)
Fl(mm)
Packaging
IR(mA)
ISAT(A)
fres(MHz)
LR(nH)
ISAT,10%(A)
ISAT,30%(A)
RDC(mΩ)
Material
Z @ 100 MHz(Ω)
Zmax(Ω)
Test Condition Zmax
IR 2(mA)
RDC max.(Ω)
Type
Winding Style
Number of windings
L1(µH)
IR(mA)
RDC max.(Ω)
VR(V (DC))
Data rate
Ports
PoE
Improved CMRR
Operating Temperature
VT(V (AC))
Mount
L(µH)
LSmin.(nH)
SamplesAvailability & Sample
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885012206083
SPECWCAP-CSGP MLCCs 50 V(DC), 1 nF, ±10%
Simu­lation
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Downloads9 files

Status Activei| Production is active. Expected lifetime: >10 years.
Product seriesWCAP-CSGP MLCCs 50 V(DC)
Capacitance1 nF
Capacitance±10% 
Size0603 
Dissipation Factor2.5 %
Insulation Resistance10 GΩ
Ceramic TypeX7R Class II 
Length1.6 mm
Width0.8 mm
Height0.8 mm
Pad Dimension0.4 mm
Packaging7" Tape & Reel 
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Rated Voltage50 V (DC)
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Operating Temperature -55 °C up to +125 °C
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885012206087
SPECWCAP-CSGP MLCCs 50 V(DC), 4.7 nF, ±10%
Simu­lation
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Downloads9 files

Status Activei| Production is active. Expected lifetime: >10 years.
Product seriesWCAP-CSGP MLCCs 50 V(DC)
Capacitance4.7 nF
Capacitance±10% 
Size0603 
Dissipation Factor2.5 %
Insulation Resistance10 GΩ
Ceramic TypeX7R Class II 
Length1.6 mm
Width0.8 mm
Height0.8 mm
Pad Dimension0.4 mm
Packaging7" Tape & Reel 
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Rated Voltage50 V (DC)
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Operating Temperature -55 °C up to +125 °C
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885012206071
SPECWCAP-CSGP MLCCs 25 V(DC), 100 nF, ±10%
Simu­lation
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Downloads9 files

Status Activei| Production is active. Expected lifetime: >10 years.
Product seriesWCAP-CSGP MLCCs 25 V(DC)
Capacitance100 nF
Capacitance±10% 
Size0603 
Dissipation Factor3.5 %
Insulation Resistance5 GΩ
Ceramic TypeX7R Class II 
Length1.6 mm
Width0.8 mm
Height0.8 mm
Pad Dimension0.4 mm
Packaging7" Tape & Reel 
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Rated Voltage25 V (DC)
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Operating Temperature -55 °C up to +125 °C
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885012206076
SPECWCAP-CSGP MLCCs 25 V(DC), 1 µF, ±10%
Simu­lation
Availability
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Downloads9 files

Status Activei| Production is active. Expected lifetime: >10 years.
Product seriesWCAP-CSGP MLCCs 25 V(DC)
Capacitance1 µF
Capacitance±10% 
Size0603 
Dissipation Factor10 %
Insulation Resistance0.5 GΩ
Ceramic TypeX7R Class II 
Length1.6 mm
Width0.8 mm
Height0.8 mm
Pad Dimension0.4 mm
Packaging7" Tape & Reel 
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Rated Voltage25 V (DC)
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Operating Temperature -55 °C up to +125 °C
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885012209028
SPECWCAP-CSGP MLCCs 25 V(DC), 10 µF, ±10%
Simu­lation
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Downloads9 files

Status Activei| Production is active. Expected lifetime: >10 years.
Product seriesWCAP-CSGP MLCCs 25 V(DC)
Capacitance10 µF
Capacitance±10% 
Size1210 
Dissipation Factor5 %
Insulation Resistance0.01 GΩ
Ceramic TypeX7R Class II 
Length3.2 mm
Width2.5 mm
Height2 mm
Pad Dimension0.3 mm
Packaging7" Tape & Reel 
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Rated Voltage25 V (DC)
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Operating Temperature -55 °C up to +125 °C
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742792641
SPECWE-CBF SMT EMI Suppression Ferrite Bead, –, –
Simu­lation
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Downloads9 files

Status Activei| Production is active. Expected lifetime: >10 years.
Product seriesWE-CBF SMT EMI Suppression Ferrite Bead
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Size0603 
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Length1.6 mm
Width0.8 mm
Height0.8 mm
Pad Dimension0.3 mm
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Rated Current1500 mA
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Impedance @ 100 MHz300 Ω
Maximum Impedance450 Ω
Maximum Impedance250 MHz 
Rated Current 22000 mA
DC Resistance0.15 Ω
TypeHigh Current 
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Number of windings1 
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Rated Current2000 mA
DC Resistance [1]0.15 Ω
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Operating Temperature -55 °C up to +125 °C
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MountSMT 
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744272251
SPECWE-SL5 SMT Common Mode Line Filter, –, –
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Downloads9 files

Status Activei| Production is active. Expected lifetime: >10 years.
Product seriesWE-SL5 SMT Common Mode Line Filter
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Length10 mm
Width8.7 mm
Height6.5 mm
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Rated Current2800 mA
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Impedance @ 100 MHz800 Ω
Maximum Impedance1200 Ω
Maximum Impedance20 MHz 
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DC Resistance0.035 Ω
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Winding Stylesectional 
Number of windings2 
Inductance [1]250 µH
Rated Current2000 mA
DC Resistance [1]0.035 Ω
Rated Voltage80 V (DC)
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Operating Temperature -40 °C up to +125 °C
Insulation Test Voltage1000 V (AC)
MountSMT 
Inductance250 µH
Leakage Inductance [min.]1500 nH
–Check availability
744042003
SPECWE-TPC SMT Tiny Power Inductor, –, –
Simu­lation
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Downloads9 files

Status Activei| Production is active. Expected lifetime: >10 years.
Product seriesWE-TPC SMT Tiny Power Inductor
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Size4818 
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Length4.8 mm
Width4.8 mm
Height1.8 mm
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Rated Current1950 mA
Saturation Current1.8 A
Self Resonant Frequency80 MHz
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DC Resistance0.065 Ω
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Number of windings9.5 
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Operating Temperature -40 °C up to +125 °C
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MountSMT 
Inductance3.3 µH
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744302015
SPECWE-HCM SMT High Current Flat Wire Inductor, –, –
Simu­lation
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Status Activei| Production is active. Expected lifetime: >10 years.
Product seriesWE-HCM SMT High Current Flat Wire Inductor
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Size7050 
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Length7.15 mm
Width7 mm
Height5 mm
Pad Dimension2.5 mm
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Rated Current30000 mA
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Self Resonant Frequency55 MHz
Rated Inductance125 nH
Saturation Current @ 10%30 A
Saturation Current @ 30%35 A
DC Resistance0.235 mΩ
MaterialMnZn 
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Number of windings1 
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Operating Temperature -40 °C up to +125 °C
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MountSMT 
Inductance0.15 µH
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749022016
SPECWE-LAN LAN Transformer, –, –
Simu­lation
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Downloads4 files

Status Activei| Production is active. Expected lifetime: >10 years.
Product seriesWE-LAN LAN Transformer
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Length18.16 mm
Width16 mm
Height10.16 mm
Pad Dimension13.97 mm
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Data rate1000BASE-T 
Ports1 
PoEPoE+ (up to 1150 mA) 
Improved Common Mode RejectionNo 
Operating Temperature 0 °C up to +70 °C
Insulation Test Voltage1500 V (AC)
MountSMT 
Inductance350 µH
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