Texas Instruments TPS2373-4EVM-758 User Manual
User's Guide
SLUUBJ1A–February 2017–Revised June 2017
TPS2373-4EVM-758 Evaluation Module
This user’s guide describes the TPS2373-4 evaluation module (TPS2373-4EVM-758). The TPS23734EVM-758 contains evaluation and reference circuitry for the TPS2373-4. The TPS2373-4 device is an
IEEE 802.3bt-compliant, powered-device (PD) controller optimized for isolated converter topologies. The
TPS2373-4EVM-758 is designed for high-efficiency, 70-W, PD solutions.
Contents
1 Introduction ................................................................................................................... 2
2 Electrical Specifications..................................................................................................... 2
3 Description.................................................................................................................... 3
4 Schematic..................................................................................................................... 4
5 General Configuration and Description ................................................................................... 6
6 TPS237xEVM-758 Performance Data .................................................................................... 8
7 EVM Assembly Drawings and Layout Guidelines ....................................................................... 9
8 Bill of Material............................................................................................................... 14
List of Figures
1 TPS2373-4EVM-758 PD Front-End Schematic.......................................................................... 4
2 TPS2373-4EVM-758 PD and DC/DC Converter Schematic........................................................... 5
3 Startup Response to Full Load (14 A) for a 48-V Input................................................................. 8
4 Transient Response from 7 A to 14 A for a 48-V Input................................................................. 8
5 Efficiency of the TPS2373-4EVM-758, V
6 Top Side Component Placement.......................................................................................... 9
7 Top Side Routing........................................................................................................... 10
8 Layer 2 Routing............................................................................................................. 10
9 Layer 3 Routing............................................................................................................. 11
10 Bottom Side Routing....................................................................................................... 11
11 Bottom Component Placement........................................................................................... 12
= 48 V....................................................................... 9
IN
1 TPS2373-4EVM-758 Electrical and Performance Specifications at 25°C............................................ 2
2 Connector Functionality..................................................................................................... 6
3 Test Points.................................................................................................................... 6
4 Jumper Descriptions......................................................................................................... 7
5 TPS237xEVM-758 BOM .................................................................................................. 14
Trademarks
All trademarks are the property of their respective owners.
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List of Tables
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TPS2373-4EVM-758 Evaluation Module
1
Introduction
1 Introduction
The TPS2373-4EVM-758 allows reference circuitry evaluation of the TPS2373-4. It contains input and
output power connectors and an array of on-board test points for circuit evaluation.
1.1 Features
The TPS2373-4EVM-758 features include:
• High-efficiency active clamp-forward converter
• Class 8, 5-V, 14-A, 70-W, DC output
1.2 Applications
The TPS2373-4EVM-758 can be used in the following applications:
• Voice over internet protocol – IP telephones
• Wireless LAN – wireless access points
• Security – wired IP cameras
• IoT applications
2 Electrical Specifications
Table 1 lists the EVM electrical specifications.
Table 1. TPS2373-4EVM-758 Electrical and Performance Specifications at 25°C
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Parameter Test Conditions Min Typ Max Unit
PD Power Interface
Input Voltage Applied to the power pins of connectors J2 or J4 0 57 V
Input UVLO, PoE inputJ2Rising input voltage 36 V
Falling input voltage 30 V
Detection Voltage At device terminals 3 10 V
Classification Voltage At device terminals 10 23 V
Classification Current RclassA = 63.4 Ω 38 42 mA
RclassB = 90.9 Ω 26.5 29.3 mA
Inrush Current-Limit 275 395 mA
Operating Current-Limit 1.9 2.5 A
DC/DC Converter (UCC2897A)
Output Voltage VIN= 48 V, I
Output Current 41.2 ≤ VIN≤ 57 V 14 A
Output Ripple Voltage
Peak-to-Peak
Efficiency, End-to-End
Switching Frequency 200 kHz
VIN= 48 V, I
VIN= 48 V, I
VIN= 48 V, I
VIN= 48 V, I
≤ I
LOAD
LOAD
LOAD
LOAD
LOAD
(max) 5.17 5.22 V
LOAD
= 14 A 100 mV
= 1 A 73 %
= 6 A 92 %
= 14 A 91 %
2
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3 Description
The TPS2373-4EVM-758 enables full evaluation of the TPS2373-4 device. Refer to the schematic shown
in Figure 1 and Figure 2. Ethernet power is applied from J1 and is dropped to the FET bridge rectifier. At
the output of the FET bridge is the EMI and EMC filter and transient protection for the TPS2373-4.
Input power can also be applied at J3 from a DC source when power at J1 is not present or when the
DC/DC converter is being evaluated and not the PoE front end.
The TPS2373-4 (U1) PD controller is shown in Figure 1. R30 provides the detection signature while J7
and J10 allow user selection of the classification signature and desired power level. To the right of U1 is
the switched side of the PD controller. The TPS2373-4 RTN pin provides inrush, current limited turn on,
and charge of the bulk capacitor C28 and C62.
The DC/DC converter is a high-efficiency, active clamp-forward converter. The primary (Q16) switching
MOSFET is driven from the U2 OUT pin and the secondary (Q13/Q15) synch switching MOSFET is in a
self-driven configuration.
Output voltage feedback is provided with U3 and associated error amplifier (U4) circuitry. R55 provides a
means for error injection to measure the frequency response of the converter. This feedback circuit drives
the U2 FB pin which provides a voltage proportional to the output load current. As the output load current
decreases, the FB pin voltage decreases.
Description
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TPS2373-4EVM-758 Evaluation Module
3
0.01µF
100V
C1
0.01µF
100V
C2
0.01µF
100V
C3
0.01µF
100V
C4
75.0
R1
75.0R275.0R375.0
R4
ETHERNETPOWER
40-57VDC
45W MAX
DATA PORT
PR12 PR36 PR45 PR78
EARTH
TCT1
1
TD1+
2
TD1-
3
TCT2
4
TD2+
5
TD2-
6
TCT3
7
TD3+
8
TD3-
9
TCT4
10
TD4+
11
TD4-
12
MX4-
13
MX4+
14
MCT4
15
MX3-
16
MX3+
17
MCT3
18
MX2-
19
MX2+
20
MCT2
21
MX1-
22
MX1+
23
MCT4
24
T1
7490220122
PR12
PR36
PR45
PR78
TP1 TP2 TP3 TP4
PAIR12 PAIR36 PAIR45 PAIR78
EARTH
TP5
1000pF
C5
2
3
4
1
5
6
7
8
9
10
11
12
J1
2
3
4
1
5
6
7
8
9
10
11
12
J2
EARTH
EARTH
301k
R5
301k
R6
301k
R7
301k
R8
301k
R19
301k
R20
301k
R21
301k
R22
66.5k
R9
66.5k
R10
66.5k
R11
66.5k
R12
66.5k
R15
66.5k
R16
66.5k
R17
66.5k
R18
1000pF
C6
1000pF
C7
1000pF
C8
1000pF
C9
1000pF
C10
1000pF
C11
1000pF
C12
1000pF
C13
1000pF
C16
1000pF
C17
1000pF
C18
1000pF
C19
1000pF
C20
1000pF
C21
1000pF
C22
1000pF
C23
D13
100V
D14
100V
D15
100V
D16
100V
D19
100V
D20
100V
D21
100V
D22
100V
8.2V
D9
8.2V
D10
8.2V
D11
8.2V
D12
8.2V
D23
8.2V
D24
8.2V
D25
8.2V
D26
3
1
2
Q2
3
1
2
Q3
3
1
2
Q4
3
1
2
Q5
3
1
2
Q7
3
1
2
Q8
3
1
2
Q9
3
1
2
Q10
D18
100V
3
1
2
Q6
499k
R13
301k
R14
PR12
PR36
PR45
PR78
PR12 PR36 PR45 PR78
BR+
BR+
BR-
1000pF
100V
C14
1000pF
100V
C15
VDD
VSS1
2
1
58V
D17
300 ohm
L1
DNP
300 ohm
L2
DNP
BR-
Additional EMI filtering may be required
13
15
9
7
8
Q1C
14
16
4
5
6
Q1B
12
1013
1115
Q1D
1
214
316
Q1A
13
15
9
7
8
Q11C
14
16
4
5
6
Q11B
12
1013
1115
Q11D
1
214
316
Q11A
132
D1
100V
DNP
132
D2
100V
DNP
132
D3
100V
DNP
132
D4
100V
DNP
132
D5
100V
DNP
132
D6
100V
DNP
132
D7
100V
DNP
132
D8
100V
DNP
1.00k
R67
3
1
2
Q18
100k
R68
100pF
C66
ADPT
RTN
60 ohm
L8
60 ohm
L9
1
2
3
4
L10
75.0
R74
75.0
R71
75.0
R73
1000pF
C67
75.0
R72
EARTH
FDMQ8205Acan be used for an integrated FET bridge solution in space constrained applications
Copyright © 2017, Texas Instruments Incorporated
Schematic
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TPS2373-4EVM-758 Evaluation Module
4 Schematic
Figure 1 and Figure 2 illustrate the EVM schematic.
Figure 1. TPS2373-4EVM-758 PD Front-End Schematic
VDD
1
DEN
2
CLS1
3
VSS
4
VSS
5
CLS2
6
REF
7
AMPS_CTL
8
MPS_DUTY
9
APD
10
RTN
11
RTN
12
PG
13
VC_OUT
14
VC_IN
15
UVLO_SEL
16
TPL
17
TPH
18
BT
19
NC
20
PAD
21
U1
TPS2373-4RGW
VDD
VSS1
TP9
TP17
VDD
VSS1
Port Current
0.1µF
C29
J11
24.9k
R30
63.4
R31
VSS
1.21k
R36
249
R35
140
R34
90.9
R33
Class3
Class2
Class1
Class0
63.4
R37
123456789
10
J10
Class4
4-Pair
90.9
R32
Class4
Class3
123
4
J7
49.9k
R40
2k
R39
1.00k
R38
TP16
AMPS_CTL
TP18
REF
AMPS_Connect
TP19
VSS
J12
TPH
TPL
BT
MPS_DUTY
RTN
100µF
C62
DNP
PG
RTN
TP14
TP15
TP10
VDD
MPS_DUTY
123
J5
VSS
53.6k
R25
VSS
TP7
MPS_DUTY
Yellow
D28
Yellow
D29
Yellow
D30
TPH TPL BT
3.74k
R26
3.74k
R27
3.74k
R28
TPH TPL BT
J4
TP11 TP12 TP13
BIAS
RTN
RTN
RTN
RTN
VCIN
GND
VOUT
RON
1
ROFF
2
VREF
3
SYNC
4
GND
5
CS
6
RSLOPE
7
FB
8
SS/SD
9
PGND
10
AUX
11
OUT
12
PVDD
13
VDD
14
LINEUV
15
LINEOV
16
NC
17
VIN
18
NC
19
RTDEL
20
EP
21
U2
UCC2897ARGPR
2.2µF
C31
2.2µF
C30
RTN
200kHz
VCOUT
VDD
RTNRTN
RTN
RTN
RTN
RTN
1000pF
C52
RTN GND
D33
1.4V
D35
1.4V
D36
1.4V
100µF
C35
RTN
4
7,8
1,2,3
5,6,
Q14
2.2µF
C33
2.2µF
C32
RTN
2,4
Q17
1
2
4
3
U3
HMHA2801A
RTN
RTN
RTN
150V
7,8
1,2,3
5,6,
Q16
2,4
Q12
D31
100V
10V
D32
511
R41
1.82k
R45
7,8
1,2,3
5,6,
Q15
0.033µF
C34
30V
7,8
1,2,3
5,6,
Q13
0.075
R47
2
1
3
U4
TLV431AIDBZR
VOUT
GND
665
R57
1µF
C60
3.3µH
L5
100µF
C36
470µF
C37
0.047µF
C47
GND
D34
0.88V
5V/14A
VCOUT
1.18k
R52
60.4k
R48
12.1k
R53
182k
R49
SS
SS
TP27
VIN
VCIN
VCOUT
0.1µF
C49
1µF
C55
RTN
10.0k
R43
0.1µF
C46
1.00k
R46
0.047µF
C50
1000pF
C53
20k
R50
100k
R51
90.9k
R54
100k
R56
1µF
C56
2.00k
R61
7.68k
R59
1µF
C57
50
R55
10.0k
R62
10.0k
R58
0.047µF
C58
20.0k
R63
1µF
C59
3.16k
R64
J13
1000pF
100V
C24
1000pF
100V
C25
40-57VDC
GND
300 ohm
L3
DNP
300 ohm
L4
DNP
J3
RTN
237k
R23
9.53k
R24
0.01µF
C26
APD
APD
APD
TP21
VDS
TP25
RTN
VCIN
TP24
TP26
FB
TP22
GATE
TP20
VOUT
TP23
GND
TP28
LOOP
0
R44
100µF
C28
47pF
C48
J6
APD_Connect
APD
1
3
2
D27
100V
4.9µH
L7
1
3
2
D38
30V
1000pF
C63
DNP
GND
R64 = 3.01k for 5.3V Output
R64 = 2.87k for 5.5V Output
470pF
C27
D37
100V
10
R42
7%DU TY11.2% DUTY
OPEN: 5.4%
Yellow
D39
GND
1.33k
R65
J15
LED
0.01µF
C64
0.1µF
C65
TP29
UVLO_SEL
0
R66
RTN
RTN
10.0k
R70
191k
R69
ADPT
250µH
1
2
3
4
L11
TP30
VCOUT
1mH
L6
0.1µF
C69
4700pF
C72
4700pF
C71
4700pF
C70
2.2µF
C68
8
6
11
10
2
5
3
4
7
1
T2
750343164
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Schematic
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TPS2373-4EVM-758 Evaluation Module
Figure 2. TPS2373-4EVM-758 PD and DC/DC Converter Schematic
General Configuration and Description
5 General Configuration and Description
5.1 Physical Access
Table 2 lists the EVM connector functionality and Table 3 describes the test point availability. Table 4
describes the jumper selections of the EVM.
Table 2. Connector Functionality
Connector Label Description
J1 ETHERNET
POWER
J2 DATA Ethernet data passthrough. Connect to downstream Ethernet device.
J13 Output Output connector to load.
J3 DC/DC Input DC/DC converter input bypassing the PoE front-end. Connect a DC
Test Point Label Description
TP1 PAIR 12 Data pair from Pins 1 and 2 of J1
TP2 PAIR 36 Data pair from Pins 3 and 6 of J1
TP3 PAIR 45 Data pair from Pins 4 and 5 of J1
TP4 PAIR 78 Data pair from Pins 7 and 8 of J1
TP5 EARTH Connect to earth ground when available
TP7 MPS_DUTY MPS_DUTY pin of the TPS2373-4
TP9, TP10 VDD Input voltage of PD system
TP11 TPH TPH output of the TPS2373-4
TP12 TPL TPL output of the TPS2373-4
TP13 BT BT output of the TPS2373-4
TP14 PG Power Good output of the TPS2373-4
TP15, TP25 RTN Load side return voltage
TP16 AMPS_CTL AMPS_CTL output voltage
TP17 VSS1 EMI filter return side voltage
TP18 REF Reference pin output voltage of the TPS2373-4
TP19 VSS PD side return voltage
TP20 VOUT Converter output voltage
TP21 VDS Drain voltage of the primary FET of the converter
TP22 GATE Gate voltage of the primary FET of the converter
TP23 GND Secondary ground connection
TP24 VCIN Bias winding circuit output voltage
TP26 FB Feedback pin voltage of U2 PWM controller
TP27 VIN Startup input voltage of U2 (open circuited)
TP28 LOOP Feedback connection for frequency response measurements
TP29 UVLO_SEL Select UVLO of U1 (open circuited)
TP30 VCOUT Output voltage of advanced startup of U1
PoE input. Connect to PSE power and data source.
power supply 40-57.
Table 3. Test Points
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Jumper Description
J4 Jump to power TPH/TPL/BT through the bias winding. Or open to power through external circuit
J5 Automatic MPS duty cycle selection
J6 Jump for adapter priority
J7 CLSA selection
J10 CLSB selection
J11 Can be used to measure port current; otherwise, J11 should be shorted
J12 Jump to add auto MPS current
J15 Jump to power output LED
General Configuration and Description
Table 4. Jumper Descriptions
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