dm00113368

AN4473
Application note
PoE synchronous flyback, IEEE802.3at compliant, 5V - 4A PD
converter based on the PM8803 controller
Antonio Rotta
Introduction
This document describes a reference design for a POE+, high efficiency, 5 V - 4 A flyback
converter based on the PM8803 PoE controller.
The PM8803 is a highly integrated device embedding an IEEE802.3at compliant “Powered
Device” (PD) interface together with a PWM controller and support for auxiliary sources.
The STEVAL-TSP004V2 reference design is based on an isolated flyback topology CCM
converter with synchronous rectification with a gate driver transformer. The same PCB can
be populated in different ways to support various configurations and topologies (the flyback
with diode rectification, synchronous flyback with or without an active clamp, self-driven
synchronous flyback).
Figure 1. STEVAL-TSP004V2 evaluation board photo
May 2015
DocID026206 Rev 1
1/30
www.st.com
Contents
AN4473
Contents
1
Main characteristics and circuit description . . . . . . . . . . . . . . . . . . . . . 3
2
Schematics for 5 V at 4 A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
3
4
2.1
Schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2.2
Bill of material . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Measurements results . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
3.1
Efficiency comparison with three rectification bridge options . . . . . . . . . . 13
3.2
Converter efficiency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
3.3
Voltage ripple . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
3.4
Startup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
3.5
Primary side waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
3.6
Secondary side waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
3.7
Load transients . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
3.8
PoE to auxiliary switchover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
3.9
Gloop . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Supporting material . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
4.1
PCB layers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
5
Electrical diagram general . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
6
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
2/30
DocID026206 Rev 1
AN4473
1
Main characteristics and circuit description
Main characteristics and circuit description
The main characteristics (reference and electrical specifications) of the converter are listed
inTable 1 and Table 2.
Table 1. Reference
Reference code
Device
PM8803
Evaluation board
STEVAL-TSP004V2
Table 2. Electrical specification
Parameter
Specifications
Input voltage supplies VIN [VDC]
From 40 to 60 V
Auxiliary input voltage range
From 30 to 60 V
Output voltage Vout [VDC]
5 VDC ± 5% at 4 A
Peak-to-peak output ripple
< 30 mVpp
Efficiency DC-DC at full load
> 92%
Efficiency overall at full load
> 89%
Transient response ΔVoutpk to 50% load step
< 180 mV
ΔVout in load line case
< 0.5%
GLOOP bandwidth
> 3 kHz
GLOOP phase margin at 0dB
> 70 deg.
GLOOP dB margin at 0 deg.
> 10 dB
This document details the characteristics and performances of the PM8803 evaluation kit
STEVAL-TSP004V2, which has been designed to cover a broad range of Power over
Ethernet (PoE) applications.
The PM8803 is a highly integrated device embedding an IEEE802.3af/at compliant powered
device (PD) interface together with a PWM controller and support for auxiliary sources.
Even though the PM8803 device can be configured to work in several isolated topologies,
self-driven or a transformer gate driven; this application note focuses on a high efficiency
isolated flyback converter topology with synchronous rectification, 5 V output voltage with
a 4 A output current capability.
Auxiliary sources can be connected to the board on 2 different input connectors. One input
(AUX II) allows prevalence of the auxiliary sources with respect to the PoE, while the other
input (AUX I) allows the usage of a wall adaptor with voltage lower than the internal PoE
UVLO threshold and still benefits from the inherent inrush and DC current limit.
DocID026206 Rev 1
3/30
30
Main characteristics and circuit description
AN4473
The possible configurations supported by the PM8803 demonstration kit as options on the
same PCB are:
•
Alternative input bridge rectification: 4 possible options including standard diode
bridges, discrete schottky diode bridges, half active bridges and full active bridges;
schottky diode bridges are mounted on this eval board.
•
Optional 4 pairs detection circuit, to detect if power is provided on 2 pairs or on 4 pairs
by a high power PSE source; this circuit is not used on this eval board.
•
Optional booster circuit, to increase the max. input current over 1 A; this circuit is not
used on this eval board.
•
Diode or synchronous rectification; 4 package options for the diode and 2 package
options for the MOSFET.
•
Primary side snubber; 3 options included an active clamp: a simple R-C snubber is
used on this eval board.
•
Power transformer; 3 size options for transformer gate driven solutions and 2 size
options for self-driven applications.
The bill of material (BOM) in Table 3 provides the list of components to be mounted to obtain
a flyback CCM converter with a gate transformer driven synchronous rectifier, with 5 V
output at a 4 A evaluation board.
4/30
DocID026206 Rev 1
10
9
Chassis
1
2
3
R26
DocID026206 Rev 1
R37
0R0
R32
15K
0805
1206
1206
SMC
STTH302S
SP
D7
SMA
STPS2H100A
D14
SMA
STPS2H100A
SMA
STPS2H100A
D9
SMA
D13
SMA
STPS2H100A
SMA
STPS2H100A
D12
SMA
STPS2H100A
SMA
STPS2H100A
D17
D8
STPS2H100A
D4
ETH1-460
24
23
0603
R7
0603
75R
75R
75R
75R
0603
0603
R5
R2
R1
Chassis
TP23
BLACK
Red
C16
1nF 10%
0805
100V
0R0
1206
TP22
BLACK
TP24
R125
C9
2.2nF
2KV
1812
R43
0R0
1206
1206
R17
0R0
VSS
POE+F
C18
0.1uF 10%
0805
100V
Chassis
SMA
SMAJ58A
D11
Chassis
1
2
3
4
5
6
7
8
J4
VSS
C21
1nF 10%
0603
100V
RTN
C14
1nF 10%
0603
100V
POE+F
DATA OUTPUT
Schematic
0R0
D1
2
1
22
21
20
19
18
17
16
15
14
13
2.1
TP3
BLACK
TP2
Red
Chassis
C12
2.2nF
2KV
1812
C8
10nF 10%
0603
100V
C7
75R
0603
R13
10nF 10%
0603
100V
75R
0603
R12
T1
Schematics for 5 V at 4 A
Auxiliary input frontal or AUXI
AUX 1
C6
10nF 10%
0603
100V
75R
0603
75R
0603
C5
10nF 10%
0603
100V
R11
R10
3
4
5
6
8
7
9
10
11
12
2
SP
J2
DATA & POWER INPUT
J3
1
2
3
4
5
6
7
8
10
9
Chassis
AN4473
Schematics for 5 V at 4 A
Figure 2. STEVAL-TSP004V2 evaluation board: electrical schematic (1/2)
5/30
30
27k
R27
C19
10nF
R38
1k
C69
10nF
R101
24.9K 1%
1%
R64
0R0
T2P
R51
15K
0805
MMBT3904LT1
SOT23
Q18
R49
R9
1K 1%
R0603
1%
R0805
R72
120K 1%
1%
R54
1206
0R0
0R0
1206
C23
470nF 10%
50V
0603
24.9K 1%
R95
30R9 1%
R131
TP8
BLACK
TP7
Red
NOTE
The ARTN is a dedicated plane of signal ground that will be connected
to the RTN power ground plane close to pin 4 and 9 of PM8803
NOTE for Resistors
Where not indicated the body is 0603 and tolerance 5%
NOTE for Capacitors
Where not indicated the body is 0603 and the voltage is 50V
VSS
SP
POE+F
SA
1
2
3
TP11
BLACK
11
12
13
14
15
16
17
18
19
20
R70
10K 1%
1%
VDD
VDD
DET
SP
CLS
DCCL
SA
DT
FRS
T2P
HTSSOP20-LARGE
PM8803
SA
Ex Pad
21
VC
0805
VSS
RTN
ARTN
GAT2
100V
C60
1nF
RTN
CS
VB
CTL
U1
GAT1
R65
1K
R58
27K
SMC
C41
1uF
25V
0603
L5
10uH
R103
R66
10R
ARTN
SOD323
MM3Z15VT1
D32
RTN
D57
R0805
R92
10R
C39
1uF
25V
0603
2.2u
1210
100V
2.2u
1210
100V
RTN
C29
C28
TP9
Red
10
9
ARTN
VC
510R
RTN
Power circuit
SOD323
C54
470p
R89
3.3K
C40
1uF
25V
1206
Input Filter
C26
33uF 20%
100V
10x10.2
2
BAT46J
C53
1uF
ARTN
SOD323
BAT46J
D52
2.2u
1210
100V
C64
1
MSS7341-103ML
8
TP14
Red
TP4
Red
7
6
5
4
3
2
1
10nF
C38
STTH302S
D21
D28
SOD323
BAT46J
R107
10K
0R0
R84
10R
R62
TP15
Red
1206
R21
220R
C30
68pF
0805
100V
TP19
BLACK
RTN
R108
0.30 ohm 1%
1206
TP18
Red
4
Red
TP16
R23
100R
1206
Q17
RTN
SO8
Si4848DY
0.1uF
C45
VSS
SP
R109
0.30 ohm 1%
1206
5
6
7
8
1
2
3
J1
3
3
TBD
2KV
1812
T5
9
10
7
6
T8
Jumper-doppio
JM2
Jumper-doppio
JM1
6
4
1
1
3
1
COILCRAFT DA2319-AL
COILCRAFT HA3691-AL
5
4
2
1
C22
2
DocID026206 Rev 1
2
R45
24.9K
0.1uF
R80
20R
2
1
Fairchild FOD817AS
U2
3
4
D36
BAT46J
SOD323
BAT46J
SOD323
D34
8
7
6
5
0805
C31
1.5nF
NOTE for Jumpers JM1 and JM2
Move the short on both jumpers at the same time:
- short between pin 1 and 2 when used AUX2 input
- short between pin 2 and 3 when used AUX1 input.
RTN
SA
R83
10K
C44
TP10
Red
TP5
Red
Q12
R44
3K3
TP21
Red
D20
Aux det
Q16
MMBT3906LT1
SOT23
TP13
Red
PowerFLAT™ 5x6
RTN
C50
47nF
R90
1k5
22uF
1206
16V
C27
22uF
1206
16V
C37
U3
22uF
1206
16V
C67
22uF
1206
16V
C68
C61
2
3
T2P
VC
1812
2KV
SOD323
BAT46J
D39
1
4
2.2n
Fairchild FOD817AS
Auxiliary present
ARTN
STL60N3LLH5
3
2
1
0805
5R
R53
1
L6
0.33uH
2
R117
C59
1uF
25V
0603
5.1K
D40
2
4
1
R93
1K
22uF
1206
16V
C33
C56
47nF
22uF
1206
16V
C35
2
1
3
4
Fairchild FOD817AS
U7
Feedback circuit
SOT23-5
TS431AILT
U4
SOD323
BAT46J
47K
R99
C49
3.3nF
Output Filter
DO1813-331ML
3
6/30
5
48V AUX 2
100pF
C55
R104
R91
10R
C34
330uF
16V
8x10.2
Out det
TP20
Red
D44
T2P det
R112
15K 1%
1%
4.7K 1%
R119
3.3K
1%
C48
1uF
25V
0603
R96
0R0
D26
R52
3K3
T2P present
0R0
R122
R111
12.4K 1%
1%
R94
21K 1%
1%
C36
0.1u
2
1
BLACK
TP12
2
J5
Red
TP6
1
Schematics for 5 V at 4 A
AN4473
Figure 3. STEVAL-TSP004V2 evaluation board: electrical schematic (2/2)
4
AN4473
2.2
Schematics for 5 V at 4 A
Bill of material
Table 3. Bill of material
Item Ref.
Description
Value
PCB footprint
Supplier
Voltage
1
C5
Ceramic Capacitor
10 nF 10%
C0603
TDK
100 V
2
C6
Ceramic Capacitor
10 nF 10%
C0603
TDK
100 V
3
C7
Ceramic Capacitor
10 nF 10%
C0603
TDK
100 V
4
C8
Ceramic Capacitor
10 nF 10%
C0603
TDK
100 V
5
C9
Ceramic Capacitor
2.2 nF
C1812
AVX
2 kV
6
C12
Ceramic Capacitor
2.2 nF
C1812
AVX
2 kV
7
C14
Ceramic Capacitor
1 nF 10%
C0603
TDK
100 V
8
C16
Ceramic Capacitor
1 nF 10%
C0805
TDK
100 V
9
C18
Ceramic Capacitor
0.1 µF 10%
C0805
TDK
100 V
10
C19
Ceramic Capacitor
10 nF
C0603
Several
50 V
11
C21
Ceramic Capacitor
1 nF 10%
C0603
TDK
100 V
12
C22
Ceramic Capacitor
TBD
C1812
AVX
2 kV
13
C23
Ceramic Capacitor
470 nF 10%
C0603
Several
50 V
14
C26 Aluminium capacitor
33 µF 20%
C-POL8-10
Panasonic EEEFK2A330P
100 V
15
C27
Ceramic Capacitor
22 µF
C1206
Murata GRM31CR61C226
ME15L
16 V
16
C28
Ceramic Capacitor
2.2 µF
C1210
Murata GRM32ER72A225
KA35L
100 V
17
C29
Ceramic Capacitor
2.2 µF
C1210
Murata GRM32ER72A225
KA35L
100V
18
C30
Ceramic Capacitor
68 pF
C0805
TDK
100 V
19
C31
Ceramic Capacitor
1.5 nF
C0805
Several
50 V
20
C33
Ceramic Capacitor
22 µF
C1206
Murata GRM31CR61C226
ME15L
16 V
21
C34 Aluminium capacitor
330 µF
C-POL8-10
Panasonic EEEFK1C331P
16 V
22
C35
Ceramic Capacitor
22 µF
C1206
Murata GRM31CR61C226
ME15L
16 V
23
C36
Ceramic Capacitor
0.1 µF
C0603
Several
50 V
24
C37
Ceramic Capacitor
22 µF
C1206
Murata GRM31CR61C226
ME15L
16 V
DocID026206 Rev 1
7/30
30
Schematics for 5 V at 4 A
AN4473
Table 3. Bill of material (continued)
Item Ref.
Description
Value
PCB footprint
Supplier
Voltage
25
C38
Ceramic Capacitor
10 nF
C0603
Several
50 V
26
C39
Ceramic Capacitor
1 µF
C0603
KEMET
25 V
27
C40
Ceramic Capacitor
1 µF
C1206
KEMET
25 V
28
C41
Ceramic Capacitor
1 µF
C0603
KEMET
25 V
29
C44
Ceramic Capacitor
0.1 µF
C0603
Several
50 V
30
C45
Ceramic Capacitor
0.1 µF
C0603
Several
50 V
31
C48
Ceramic Capacitor
1 µF
C0603
KEMET
25 V
32
C49
Ceramic Capacitor
3.3 nF
C0603
Several
50 V
33
C50
Ceramic Capacitor
47 nF
C0603
Several
50 V
34
C53
Ceramic Capacitor
1 µF
C0603
KEMET
25 V
35
C54
Ceramic Capacitor
470 pF
C0603
Several
50 V
36
C55
Ceramic Capacitor
100 pF
C0603
Several
50 V
37
C56
Ceramic Capacitor
47 nF
C0603
Several
50 V
38
C59
Ceramic Capacitor
1 µF
C0603
KEMET
25 V
39
C60
Ceramic Capacitor
1 nF
C0805
TDK
100 V
40
C61
Ceramic Capacitor
2.2 nF
C1812
AVX
2 kV
41
C64
Ceramic Capacitor
2.2 µF
C1210
MURATA GRM32ER72A225
KA35L
100 V
42
C67
Ceramic Capacitor
22 µF
C1206
Murata GRM31CR61C226
ME15L
16 V
43
C68
Ceramic Capacitor
22 µF
C1206
Murata GRM31CR61C226
ME15L
16 V
44
C69
Ceramic Capacitor
10 nF
C0603
Several
50 V
45
D1
Diode
STTH302S
SMC
STMicroelectronics
46
D4
Schottky Diode
STPS2H100A
SMA
STMicroelectronics
47
D7
Schottky Diode
STPS2H100A
SMA
STMicroelectronics
48
D8
Schottky Diode
STPS2H100A
SMA
STMicroelectronics
49
D9
Schottky Diode
STPS2H100A
SMA
STMicroelectronics
50
D11
TVS diode
SMAJ58A
SMA
STMicroelectronics
51
D12
Schottky Diode
STPS2H100A
SMA
STMicroelectronics
52
D13
Schottky Diode
STPS2H100A
SMA
STMicroelectronics
53
D14
Schottky Diode
STPS2H100A
SMA
STMicroelectronics
54
D17
Schottky Diode
STPS2H100A
SMA
STMicroelectronics
55
D20
Diode LED
Aux det
KA-3528SGT
Kingbright
8/30
DocID026206 Rev 1
AN4473
Schematics for 5 V at 4 A
Table 3. Bill of material (continued)
Item Ref.
Description
Value
PCB footprint
Supplier
56
D21
Diode
STTH302S
SMC
STMicroelectronics
57
D26
Diode LED
Out det
KA-3528SGT
Kingbright
58
D28
Schottky Diode
BAT46J
SOD323
STMicroelectronics
59
D32
Zenere Diode
MM3Z15VT1
SOD323
Onsemi
60
D34
Schottky Diode
BAT46J
SOD323
STMicroelectronics
61
D36
Schottky Diode
BAT46J
SOD323
STMicroelectronics
62
D39
Schottky Diode
BAT46J
SOD323
STMicroelectronics
63
D40
Schottky Diode
BAT46J
SOD323
STMicroelectronics
64
D44
Diode LED
T2P det
KA-3528SGT
Kingbright
65
D52
Schottky Diode
BAT46J
SOD323
STMicroelectronics
66
D57
Schottky Diode
BAT46J
SOD323
STMicroelectronics
67
JM1
Connector
Jumper-doppio
3PIN-P254
Several
68
JM2
Connector
Jumper-doppio
3PIN-P254
Several
69
J1
Connector
SA
P-JACK-RAPC722
Several
70
J2
Connector
SP
P-JACK-RAPC722
Several
71
J3
Connector
DATA & POWER INPUT
RJ45-8PIN
Molex
72
J4
Connector
DATA OUTPUT
RJ45-8PIN
Molex
73
J5
Connector
MOR-10X10.5-P5-2PIN
MOR-2POLI-508
Several
74
L5
Inductor
10uH
MSS7341-103ML
Coilcraft
75
L6
Inductor
0.33uH
DO1813H
Coilcraft
76
Q12
Mosfet
STL60N3LLH5
PowerFLAT™ 5x6
STMicroelectronics
77
Q16
Mosfet
MMBT3906LT1
SOT23
Several
78
Q17
Mosfet
Si4848DY
so8pwrpak-SO8
VISHAY
79
Q18
Mosfet
MMBT3904LT1
SOT23
Several
80
R1
Resistor
75R
R0603
Several
81
R2
Resistor
75R
R0603
Several
82
R5
Resistor
75R
R0603
Several
83
R7
Resistor
75R
R0603
Several
84
R9
Resistor
1K 1%
R0603
Several
85
R10
Resistor
75R
R0603
Several
86
R11
Resistor
75R
R0603
Several
87
R12
Resistor
75R
R0603
Several
88
R13
Resistor
75R
R0603
Several
89
R17
Resistor
0R0
R0805
Several
90
R21
Resistor
220R
R1206
Several
DocID026206 Rev 1
Voltage
9/30
30
Schematics for 5 V at 4 A
AN4473
Table 3. Bill of material (continued)
Item Ref.
Description
Value
PCB footprint
Supplier
91
R23
Resistor
100R
R1206
Several
92
R26
Resistor
0R0
R1206
Several
93
R27
Resistor
27k
R0603
Several
94
R32
Resistor
15K
R0805
Several
95
R37
Resistor
0R0
R1206
Several
96
R38
Resistor
1k
R0603
Several
97
R43
Resistor
0R0
R0805
Several
98
R44
Resistor
3K3
R0603
Several
99
R45
Resistor
24.9K
R0603
Several
100
R49
Resistor
0R0
R1206
Several
101
R51
Resistor
15K
R0805
Several
102
R52
Resistor
3K3
R0603
Several
103
R53
Resistor
5R
R1206
Several
104
R54
Resistor
0R0
R1206
Several
105
R58
Resistor
27K
R0603
Several
106
R62
Resistor
10R
R0603
Several
107
R64
Resistor
0R0
R0603
Several
108
R65
Resistor
1K
R0603
Several
109
R66
Resistor
10R
R0603
Several
110
R70
Resistor
10K 1%
R0603
Several
111
R72
Resistor
120K 1%
R0603
Several
112
R80
Resistor
20R
R0805
Several
113
R83
Resistor
10K
R0603
Several
114
R84
Resistor
0R0
R0603
Several
115
R89
Resistor
3.3K
R0603
Several
116
R90
Resistor
1k5
R0603
Several
117
R91
Resistor
10R
R0603
Several
118
R92
Resistor
10R
R0805
Several
119
R93
Resistor
1K
R0603
Several
120
R94
Resistor
21K 1%
R0603
Several
121
R95
Resistor
24.9K 1%
R0603
Several
122
R96
Resistor
0R0
R0603
Several
123
R99
Resistor
47K
R0603
Several
124 R101
Resistor
24.9K 1%
R0603
Several
125 R103
Resistor
510R
R0603
Several
10/30
DocID026206 Rev 1
Voltage
AN4473
Schematics for 5 V at 4 A
Table 3. Bill of material (continued)
Item Ref.
Description
Value
PCB footprint
Supplier
126 R104
Resistor
4.7K 1%
R0603
Several
127 R107
Resistor
10K
R0603
Several
128 R108
Resistor
0.30 ohm 1%
R1206
Bourns
129 R109
Resistor
0.30 ohm 1%
R1206
Bourns
130 R111
Resistor
12.4K 1%
R0603
Several
131 R112
Resistor
15K 1%
R0603
Several
132 R117
Resistor
5.1K
R0603
Several
133 R119
Resistor
3.3K
R0603
Several
134 R122
Resistor
0R0
R0603
Several
135 R125
Resistor
0R0
R1206
Several
136 R131
Resistor
30R9 1%
R0805
Several
137
TP2
Test Point
Red
TH-5013
Keystone
138
TP3
Test Point
BLACK
TH-5013
Keystone
139
TP4
Test Point
Red
TH-5013
Keystone
140
TP5
Test Point
Red
TH-5013
Keystone
141
TP6
Test Point
Red
TH-5013
Keystone
142
TP7
Test Point
Red
TH-5013
Keystone
143
TP8
Test Point
BLACK
TH-5013
Keystone
144
TP9
Test Point
Red
TH-5013
Keystone
145 TP10
Test Point
Red
TH-5013
Keystone
146 TP11
Test Point
BLACK
TH-5013
Keystone
147 TP12
Test Point
BLACK
TH-5013
Keystone
148 TP13
Test Point
Red
TH-5013
Keystone
149 TP14
Test Point
Red
TH-5013
Keystone
150 TP15
Test Point
Red
TH-5013
Keystone
151 TP16
Test Point
Red
TH-5013
Keystone
152 TP18
Test Point
Red
TH-5013
Keystone
153 TP19
Test Point
BLACK
TH-5013
Keystone
154 TP20
Test Point
Red
TH-5013
Keystone
155 TP21
Test Point
Red
TH-5013
Keystone
156 TP22
Test Point
Red
TH-5013
Keystone
157 TP23
Test Point
BLACK
TH-5013
Keystone
158 TP24
Test Point
BLACK
TH-5013
Keystone
159
T1
Data Transfo
ETH1-460
ETH1-460
Coilcraft
160
T5
Power Transfo
COILCRAFT HA3691-AL
PA2328NL
Coilcraft
DocID026206 Rev 1
Voltage
11/30
30
Schematics for 5 V at 4 A
AN4473
Table 3. Bill of material (continued)
Item Ref.
Description
Value
PCB footprint
Supplier
DA2318-AL
Coilcraft
161
T8
Power Transfo
COILCRAFT DA2319-AL
162
U1
Controller IC
PM8803
163
U2
Optocoupler
Fairchild FOD817AS
FOD817
Fairchild
164
U3
Optocoupler
Fairchild FOD817AS
FOD817
Fairchild
165
U4
Voltage Reference
TS431AILT
SOT23-5L
STMicroelectronics
166
U7
Optocoupler
Fairchild FOD817AS
FOD817
Fairchild
12/30
HTSSOP20-LARGE STMicroelectronics
DocID026206 Rev 1
Voltage
AN4473
Measurements results
3
Measurements results
3.1
Efficiency comparison with three rectification bridge options
STEVAL-TSP004V2 provides different rectification bridge options: single Schottky diode,
half active bridge, full active bridge and diode bridge. They are alternatively usable thanks
the options available on the STEVAL-TSP004V2 demo’s PCB. Efficiency measurements
have been executed to compare the different characteristics cost/efficiency through three
different rectification bridge options. Here below the schematics:
Figure 4. Schematic Schottky bridge
T1 pin.4
AUX 1
TP2
Red
J2
T1 pin.1
SP
1
2
3
T1 pin.10
T1 pin.7
D1
R26
POE+F
0R0
1206
STTH302S
SMC
SP
D4
D7
STPS2H100A
STPS2H100A
SMA
SMA
D8
D9
STPS2H100A
STPS2H100A
SMA
SMA
C15
NM
0805
R32
15K
0805
D14
D12
D17
STPS2H100A
STPS2H100A
STPS2H100A
SMA
SMA
SMA
D13
STPS2H100A
SMA
R37
VSS
0R0
1206
TP3
BLACK
Figure 5. Schematic full active bridge
AUX 1
TP2
Red
SP
D1
R26
1
2
3
T1 pin.1
T1 pin.7
T1 pin.4
T1 pin.10
POE+F
STTH302S
0603
4
Q1
R30
1M
0603
P-Ch. 100V
R29
1M
0603
SO8
D3
C15
1
2
3
4
Q4
Q3
P-Ch. 100V
P-Ch. 100V
SO8
D2
MM3Z15VT1
SOD323
MM3Z15VT1
SOD323
D5
MM3Z15VT1
SOD323
D15
MM3Z15VT1
SOD323
D16
MM3Z15VT1
SOD323
D18
MM3Z15VT1
SOD323
R31
1M
0603
SO8
D6
MM3Z15VT1
SOD323
NM
0805
R39
200K
0603
SO8
C77
NM
R40
200K
R36
1M
0603
Q8
N-Ch. 100V
SO8
4
0603
C78
NM
R41
200K
0603
5
6
7
8
Q7
N-Ch. 100V
4
4
C76
NM
R35
1M
0603
4
C79
NM
R42
200K
0603
1
2
3
SO8
5
6
7
8
Q6
N-Ch. 100V
D19
MM3Z15VT1
SOD323
1
2
3
R34
1M
0603
SO8
5
6
7
8
Q5
N-Ch. 100V
1
2
3
R33
1M
0603
5
6
7
8
R32
15K
0805
C75
NM
5
6
7
8
SO8
R22
200K
0603
4
Q2
P-Ch. 100V
5
6
7
8
R28
1M
0603
C74
NM
R25
200K
0603
5
6
7
8
C73
NM
4
1
2
3
C72
NM
R20
200K
5
6
7
8
SP
R19
200K
0603
1
2
3
SMC
1
2
3
0R0
1206
1
2
3
J2
R37
VSS
TP3
BLACK
0R0
1206
DocID026206 Rev 1
13/30
30
Measurements results
AN4473
Figure 6. Schematic half active bridge
T1 pin.4
TP2
Red
R26
1
2
3
T1 pin.1
T1 pin.7
T1 pin.10
SP
D1
POE+F
0R0
1206
STTH302S
SMC
D4
D7
STPS2H100A
SP
D8
STPS2H100A
D9
STPS2H100A
SMA
SMA
STPS2H100A
SMA
SMA
C15
NM
0805
R34
1M
0603
Q6
N-Ch. 100V
SO8
SO8
Q7
C77
NM
Q8
N-Ch. 100V
SO8
SO8
4
4
1
2
3
R40
200K
0603
1
2
3
R39
200K
0603
R36
1M
0603
N-Ch. 100V
4
4
C76
NM
R35
1M
0603
C78
NM
5
6
7
8
N-Ch. 100V
R41
200K
0603
C79
NM
R42
200K
0603
1
2
3
Q5
5
6
7
8
R33
1M
0603
D19
MM3Z15VT1
SOD323
D18
MM3Z15VT1
SOD323
D16
MM3Z15VT1
SOD323
5
6
7
8
D15
MM3Z15VT1
SOD323
5
6
7
8
R32
15K
0805
1
2
3
AUX 1
J2
R37
VSS
TP3
BLACK
0R0
1206
The measurement has been executed providing a 48V on the RJ45 connector and
connecting the Poe+/Vss (TP22 vs TP23) with external electronic load with different current
values to cover around 40W of input power.
Figure 7. Comparison efficiency bridge
Efficiency Data Transfo + Bridge
Efficiency [%]
100.0%
99.5%
99.0%
98.5%
98.0%
97.5%
Schottky Diode Bridge
97.0%
Full Active Bridge
Half Active Bridge
96.5%
800
700
600
500
400
300
200
100
0
96.0%
Input Current [mA]
Figure 7 shows the input stage efficiency comparison with three different bridge rectification
type. The green line shows the efficiency of the Schottky diode bridge option, the cheaper of
them, populated with four Schottky diodes STPS2H100A of each bridge. The yellow line
shows the efficiency of the full active bridge, the most efficient, using two 100 V- 240 mΩ Pchannel MOSFET on high side and two 100V 65 mΩ N-channel MOSFET on low side of
each bridge. The red line shows the half active bridge solution, which represent a right
compromise in term of cost vs. efficiency.
14/30
DocID026206 Rev 1
AN4473
Measurements results
Changing the input bridge it is possible to gain up to 2% about on the overall converter
efficiency.
3.2
Converter efficiency
Figure 8. Overall and DC/DC efficiency
5 Vout Overall and DC/DC Efficiency
Efficiency
94%
93%
92%
91%
90%
89%
Overall with Schottky
88%
Overall FAB
87%
DC-DC
Overall HAB
86%
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
Iout [mA]
Figure 8 shows overall and DC/DC efficiencies for the converter at 48Vindc.
The dotted green line is the STEVAL-TSP004V2 DC-DC efficiency. The measurement has
been executed supplying 48 V to the input RJ45 connector J1 and measuring the input
voltage by TP22/TP23, input voltage of DC-DC converter stage. Figure 8 shows also the
overall efficiency comparison measured with the same DC-DC converter stage connected to
the three different rectification bridge stages previously mentioned.
Please note that:
•
Overall efficiency includes all loss from RJ45 to the output voltage rail.
•
DC/DC efficiency is a figure of merit of the converter standalone and typically does not
include the losses associated to the PoE interface section that are: the RJ45 connector,
data transformer, bridges, power consumption of the I/F of the PM8803 device.
On the STEVAL-TSP004V2 evaluation board is mounted the simple Schottky diodes bridge
solution (green line).
Thanks to the bridge rectification options foreseen on the pcb it is then possible to select the
best compromise cost/efficiency depending on the target request.
DocID026206 Rev 1
15/30
30
Measurements results
AN4473
Figure 9. Output voltage drift
Output Voltage
5 Vout changhe with load
5.170
drift 5V at 48V
5.165
5.160
5.155
0.0
1.0
2.0
Iout [mA]
16/30
DocID026206 Rev 1
3.0
4.0
AN4473
3.3
Measurements results
Voltage ripple
Figure 10. Ripple on 5 V at 0.4 A
Figure 11. Ripple on 5 V at 4 A
CH2: output current
CH4: output voltage
CH2: output current
CH4: output voltage
Above measurements are referred at the output voltage ripple.
In Figure 12 and Figure 13 a measure of the ripple on the input voltage has been done, to
give an indication of the noise at the input of the converter.
Figure 12. Ripple before and after input filter
with 5 V at 0.4 A (measured on C26 and C28)
Figure 13. Ripple before and after input filter
with 5 V at 4 A (measured on C26 and C28)
CH1: ripple after input filter
CH2: input current
CH3: ripple before input filter
CH4: primary Vgate
CH1: ripple after input filter
CH2: input current
CH3: ripple before input filter
CH4: primary Vgate
DocID026206 Rev 1
17/30
30
Measurements results
3.4
AN4473
Startup
Figure 14. Startup from Microsemi 9001G
injector - 5 V at 0.4 A
Figure 15. Startup from Microsemi 9001G
injector - 5 V at 4 A
CH1: VCC
CH2: input current
CH3: VSS - RTN
CH4: output voltage
CH1: VCC
CH2: input current
CH3: VSS - RTN
CH4: output voltage
Figure 16. Startup from Microsemi 9501G
injector- 5 V at 0.4 A
Figure 17. Startup from Microsemi 9501G
injector- 5 V at 4 A
CH1: Tx Rx input current
CH2: spare input current
CH3: VSS - RTN
CH4: output voltage
CH1: Tx Rx input current
CH2: spare input current
CH3: VSS - RTN
CH4: output voltage
18/30
DocID026206 Rev 1
AN4473
Measurements results
Figure 18. Detail of the output voltage at startup Figure 19. Detail of the output voltage at startup
with no load
with 4 A load
CH2: input current
CH4: output voltage
CH2: input current
CH4: output voltage
DocID026206 Rev 1
19/30
30
Measurements results
3.5
AN4473
Primary side waveforms
Figure 20. Primary steady state 0.4 A
Figure 21. Primary steady state 4 A
CH1: primary MOSFET drain
CH2: input current
CH4: primary MOSFET gate
CH1: primary MOSFET drain
CH2: input current
CH4: primary MOSFET gate
Figure 22. Detail of primary drain at 4 A load
CH1: primary MOSFET drain
CH2: input current
CH4: primary MOSFET gate
20/30
DocID026206 Rev 1
AN4473
3.6
Measurements results
Secondary side waveforms
Figure 23. Secondary steady state 0.4 A
Figure 24. Secondary steady state 4 A
CH1: secondary MOSFET drain
CH2: input current
CH4: secondary MOSFET gate
CH1: secondary MOSFET drain
CH2: input current
CH4: secondary MOSFET gate
Figure 25. Detail of secondary drain at 4 A load
CH1: secondary MOSFET drain
CH2: input current
CH4: secondary MOSFET gate
DocID026206 Rev 1
21/30
30
Measurements results
3.7
3.8
AN4473
Load transients
Figure 26. 2 A - 4 A load transient
Figure 27. 0.4 A - 4 A load transient
CH2: output current
CH4: output voltage
CH2: output current
CH4: output voltage
PoE to auxiliary switchover
Figure 28. PoE to auxiliary switchover
CH1:converter input voltage
CH2: PoE input current
CH3: T2P signal
CH4: output voltage
In Figure 28 is shown a smooth transition from a PoE line set to 54 V toward an auxiliary
adapter at 44 V; the output voltage is maintained stable during the transition.
22/30
DocID026206 Rev 1
AN4473
3.9
Measurements results
Gloop
Figure 29. Gloop 48 V at 4 A
Figure 30. Gloop 48 V at no load
Bw: 3.2 KHz
GM:10.6 dB
PM: 70 deg.
Bw: 4.0 KHz
GM:12.2 dB
PM: 77 deg.
Figure 31. Gloop 40 V at 4 A
Figure 32. Gloop 57 V at no load
Bw: 3.2 KHz
GM:10.6 dB
PM: 70 deg.
Bw: 4.2 KHz
GM:11.7 dB
PM: 78 deg.
DocID026206 Rev 1
23/30
30
Supporting material
AN4473
4
Supporting material
4.1
PCB layers
Figure 33. PCB top assembly
Figure 34. PCB bottom assembly
24/30
DocID026206 Rev 1
AN4473
Supporting material
Figure 35. PCB layer 1 top
Figure 36. PCB layer 2
DocID026206 Rev 1
25/30
30
Supporting material
AN4473
Figure 37. PCB layer 3
Figure 38. PCB layer 4 bottom
26/30
DocID026206 Rev 1
Chassis
10
9
1
2
3
TP3
BLACK
TP2
Red
R26
R37
0R0
R32
15K
0805
0R0
Auxiliary input frontal or AUXI
AUX 1
SP
J2
1206
1206
D1
NM
0805
C15
SMC
STTH302S
SP
C76
R33
0603
R28
0603
C72
SOD323
D15
R39
0603
SOD323
D2
R19
0603
SO8
Q5
4
Q1
SO8
4
1
2
3
5
6
7
8
5
6
7
8
C77
R34
0603
R29
0603
C73
D16
SOD323
D3
SOD323
4
R40
0603
4
Q6
SO8
Q2
SO8
R20
0603
0805
R16
NM
C6
10nF
0603
100V
75R
0603
75R
0603
C5
10nF
0603
100V
R11
R10
1
2
3
5
6
7
8
5
6
7
8
DATA & POWER INPUT
Chassis
<Description>
D14
SMA
STPS2H100A
3
D7
SMA
STPS2H100A
10nF
0603
100V
10nF
0603
100V
C12
2.2nF
2KV
1812
C8
75R
0603
75R
0603
C7
R13
R12
1
2
J3
D17
SMA
STPS2H100A
D24
4
D4
SMA
STPS2H100A
<Description>
D12
SMA
STPS2H100A
3
D8
SMA
STPS2H100A
1
2
D13
SMA
STPS2H100A
D25
4
D9
SMA
STPS2H100A
C78
R35
0603
R30
0603
C74
D18
SOD323
D5
SOD323
R41
0603
Q7
SO8
Q3
SO8
R22
0603
4
4
SOD323
BAT46J
D47
SOD323
BAT46J
D33
SOD323
BAT46J
D30
SOD323
BAT46J
D29
4 pairs detection circuit
Optional
2
1
3
4
5
6
8
7
9
10
1
2
3
5
6
7
8
5
6
7
8
C79
R36
0603
R31
0603
C75
ETH1-460
1M
0603
0603
D19
SOD323
D6
SOD323
R42
0603
R25
0603
SOD323
BAT46J
D49
SOD323
BAT46J
D48
R6
1M
24
23
22
21
20
19
18
17
16
15
14
13
R8
T1
4
Q8
SO8
Q4
SO8
4
1
2
3
5
6
7
8
5
6
7
8
11
75R
NM
R1000
0603
1M
R24
0603
1M
R55
0603
D56
MM3Z15VT1
SOD323
0805
R15
NM
0603
R7
0603
75R
75R
75R
0603
0603
R5
R2
R1
C16
1nF
0805
100V
Chassis
Red
TP22
VSS
C20
NM
0603
100V
RTN
C13
NM
0603
100V
47K
R46
0R
1206
TP23
BLACK
SMA
NM
D10
Q22
2N7002
BLACK
TP24
R125
C9
2.2nF
2KV
1812
NM
0R
T2
1206
R17
R43
1206
POE+F
Red
TP25
Chassis
Vout
Chassis
1
2
3
4
5
6
7
8
VSS
T11
Pulse PE65855NL - NM
C18
0.1uF
0805
100V
4 pairs detection signal
D50
4P det
R47
3K3
Input Common Mode Filter
0R
Wurth 744226S - NM
C17
NM
0805
100V
3
4
3
4
Sharp PC3H7 - NM
U12
2
1
2
1
Fairchild FOD817AS
U6
POE+F
1206
R14
1
2
12
4
1
2
3
4
5
6
7
8
3
Chassis
-
1
2
3
+
1
2
3
-
1
2
3
+
1
2
3
4
3
DocID026206 Rev 1
1
10
9
C14
1nF
0603
100V
SMA
C21
1nF
0603
100V
RTN
SMAJ58A
D11
J4
VSS
POE+F
DATA OUTPUT
5
2
AN4473
Electrical diagram general
Electrical diagram general
Figure 39. Schematic 1 of 2 (general)
27/30
30
SP
NM
R57
NM
100V
0805
NM
C62
27k
R27
C19
NM
C25
NM
R38
1k
C69
10nF
1M
R127
100K
R126
NM
Q19
MMBT3904LT1
SOT23
For PM8803C only
NM
C66
1
2
3
1
2
3
NOTE
The ARTN is a dedicated plane of signal ground that will be connected
to the RTN power ground plane close to pin 4 and 9 of PM8803
SO8
R9
1K 1%
r0603
1%
5
6
7
8
R73
r0805
1206
0R
1206
0R
Q23
11
12
13
14
15
16
17
18
19
R128
NM
100K
R129
470pF
50V
C71
D53
D42
HTSSOP20-LARGE
PM8803
VDD
VDD
DET
SP
CLS
DCCL
SA
DT
FRS
T2P
R998
NM
1%
R997
NM
1%
SA
BAT46J
SOD323
R102
NM
1%
0805
R999
NM
1%
20
C24
NM
0805
R67
NM
1%
2
NM
TP11
BLACK
MMBTA92
SOT23
C23
470nF 10%
50V
0603
R95
24.9K
STS4NF100
Q24
R131
R70
21K
1%
R54
R49
30R9 1%
T2P
R51
15K
0805
R72
100k
1%
TP8
BLACK
TP7
Red
MMBT3904LT1
SOT23
Q18
Booster
C70
1 nF
50V
0603
D55
MM3Z15VT1
SOD323
R101
24.9K
1%
R64
0R
NOTE for Resistors
Where not indicated the body is 0603 and tolerance 5%
NOTE for Capacitors
Where not indicated the body is 0603 and the voltage is 50V
VSS
VSS
SOD323
BAT46J
D51
NM
R56
POE+F
POE+F
SA
J1
48V AUX 2
3
1
Prevedere footprint 1206 e 1210 per C51
4
Ex Pad
21
RTN
CS
VB
CTL
U1
100K
R130
NM
SMA
C60
VSS
RTN
ARTN
GAT2
VC
GAT1
R65
1K
R58
27K
10
9
8
7
6
5
4
3
2
1
0805
TP14
Red
TP4
Red
BAT46J
SOD323
D54
C32
NM
0805
1
SA
1
10uH
Input Filter
C26
33uF
100V
10x10.2
MSS7341-103ML
L5
Q11
TBD
SOT23
VAUX
C53
1uF
C46
R89
C40
NM
16V
0805
VC
3
510R
R103
C54
470p
NM
3.3K
Q14 NM
MMBT3904LT1
SOT23
R100
NM
ARTN
ARTN
SOD323
C41
1uF
16V
0603
2.2u
1210
100V
C64
BAT46J
D52
Option Booster
100V
10nF
C38
1nF
SMC
STTH302S
D21
C43
NM
25V
4x6
2
R66
10R
TSSOP6
SOT23-6L
Q25
ARTN
0R
1
D37
SOD323
BAT46J
D57
SOD323
SOD323
22R
RTN
3TBD
DPack
2
Q10
D45
TP15
Red
1
R107
10k
D23
packages
P_gate
P_source
Alternative mosfet
VSS
SP
P_gate
3
P_source
3TBD
SOT223
RTN
R109
0.30 ohm
1206
Q17
SO8
2KV
1812
TBD
3
9
10
7
8
T7
T6
9
8
7
12
11
10
6
4
5
4
PA0184-Pulse
T4
JM1
Jumper-doppio
JM2
Jumper-doppio
1
1
D41
C57
0.1uF
SA
R106
10K
TP17
Red
R83
10K
0.1uF
1
NM
4
R45
33K
RTN
Vaux P
Q20
Si2325DS
SOT23
U2
Sharp PC3H7
U11
2
1
2
3
4
3
4
Q21
IRF6216PbF
SO8
Q15
1nF
D36
BAT46J
SOD323
BAT46J
SOD323
D34
Fairchild FOD817AS
1
8
7
6
5
0805
C31
MMBT3904LT1 NM
SOT23
Vgate
Kathode
Q12
10R
TP21
Red
D20
Aux det
R44
1K
C47
NM
Q16
MMBT3906LT1
SOT23
TP13
Red
Power Flat 5x6
RTN
C50
0.1uF
R90
680R
10uF
1206
16V
C27
8
7
11
12
10
9
10uF
1206
16V
C37
U3
10uF
1206
16V
C67
10uF
1206
16V
C68
T2P
VC
1812
2.2n
2KV
SOD323
BAT46J
D39
2
1206
0R
L7
0.33uH
2
0.33uH
DO3316P-103ML
1
L6
R59
DO1813-331ML
1
T10
R117
C59
1uF
16V
0603
NM
2
COILCRAFT FA2706-BL
1
2
5
6
3
4
5.1K
D40
8
7
11
12
10
9
U4
C56
NM
R97
2
SOT23-5
Sharp PC3H7
U10
2
1
2
1
3
4
3
4
Fairchild FOD817AS
U7
C55
47nF
10uF
1206
16V
C35
TS431AILT
2
R93
1K
10uF
1206
16V
C33
Feedback circuit
SOT23
TS2431AILT
U5
SOD323
BAT46J
47K
R99
C49
10nF
Output Filter
Opto :un footprint nell'altro
C61
3
1
2
3
4
1
4
Sharp PC3H7
U9
Fairchild FOD817AS
Auxiliary present
ARTN
Anode
STL66N3LLH5
3
2
1
0805
R53
T9 NM
COILCRAFT GA3278-BL
1
2
5
6
3
4
2 alternative power transformer
Option Self Driven
C51
47nF
200V
1206
10R
C42
NM
16V
0603
R80
R71
Option Active Clamp
C44
D31
SOD323
BAT46J NM
TP10
Red
TP5
Red
Vo
P_drain
Vin
NOTE for Jumpers JM1 and JM2
Move the short on both jumpers at the same time:
- short between pin 1 and 3 when used AUX2 input
- short between pin 2 and 3 when used AUX1 input.
RTN
SOD323
BAT46J
0R
SOD323
BAT46J
D38
T5
9
10
7
6
R98
3
1
8
1
Coilcraft HA3691-AL
5
4
2
1
COILCRAFT POE300F-50L
6
5
2
1
3
4
COILCRAFT POE13P
1
2
3
4
C22
T8 COILCRAFT DA2319-AL
Vin
P_drain
Si4848DY
0.1uF
C45
RTN
2
Q13
P_drain
R108
0.30 ohm
1206
TP18
Red
4
Red
TP19
BLACK
SMA
TP16
1206
220 1206
NM
220
Q9
MMBT3906LT1 NM
SOT23
0R
R84
10R
R62
R23
R21
C30
100pF
0805
100V
Kathode
DPAK
STPS15L45CB
PowerFLAT 5x6
R18
NM
1206
BAT46J
D28
RTN
Vaux P
BAT46J
R0805
R92
2.2u
1210
100V
C63
PowerFLAT 3x3
Power circuit
R0805
R48
SOD323
D22
STPS15L30CDJF
STPS8L30DEE
SMB
STPS2L30UF
D46
RTN
MM3Z15VT1
D32
C39
1uF
16V
0603
2.2u
1210
100V
VAUX
C29
2.2u
1210
100V
TP9
Red
C28
RTN
Anode
D43
A1
K
A2
A1
K
A2
5
6
7
8
1
2
3
packages
2
3
2
Alternative diode
1
2
3
4
per C40
3
2
5
6
7
8
Prevedere footprint 1206,0805
5
6
1
2
4
1
3
4
1
0R
R96
0R
10
D26
TP20
Red
C36
0.1u
R111
12.4k
1%
R94
21k
1%
2
1
Vgate
2
1
J5
Red
TP6
BLACK
TP12
Kathode
Vo
T2P present
0R
R122
Vout
R52
1K
D44
T2P det
R112
15K
1%
4.7K
R119
1K
1%
C48
1uF
16V
0603
R91
R104
100pF
C34
330uF
6.3V
8x10.2
R60
BAT46J NM
SOD323
D35
Out det
I footprint devono esssere
il piu' possibile sovrapposti,
al fine di minimizzare lo
spazio usato.
2
3
2
2
3
DocID026206 Rev 1
5
28/30
3
Electrical diagram general
AN4473
Figure 40. Schematic 2 of 2 (general)
AN4473
6
Revision history
Revision history
Table 4. Document revision history
Date
Revision
25-May-2015
1
Changes
Initial release.
DocID026206 Rev 1
29/30
30
AN4473
IMPORTANT NOTICE – PLEASE READ CAREFULLY
STMicroelectronics NV and its subsidiaries (“ST”) reserve the right to make changes, corrections, enhancements, modifications, and
improvements to ST products and/or to this document at any time without notice. Purchasers should obtain the latest relevant information on
ST products before placing orders. ST products are sold pursuant to ST’s terms and conditions of sale in place at the time of order
acknowledgement.
Purchasers are solely responsible for the choice, selection, and use of ST products and ST assumes no liability for application assistance or
the design of Purchasers’ products.
No license, express or implied, to any intellectual property right is granted by ST herein.
Resale of ST products with provisions different from the information set forth herein shall void any warranty granted by ST for such product.
ST and the ST logo are trademarks of ST. All other product or service names are the property of their respective owners.
Information in this document supersedes and replaces information previously supplied in any prior versions of this document.
© 2015 STMicroelectronics – All rights reserved
30/30
DocID026206 Rev 1
Similar pages