cd00213562

AN2838
Application note
35 W wide-range high power factor flyback converter evaluation
board using the L6562A
Introduction
This application note describes a product evaluation board based on the transition-mode
PFC controller L6562A, and presents the results of its bench demonstration. The board is a
35 W, wide-range mains input, power factor corrected SMPS (switched mode power supply)
suitable for all low power applications requiring a high PF (power factor), such as lighting
applications and power supplies for LEDs. The low-cost L6562A and the simple flyback
topology combine to provide a very competitive PFC controller solution.
Figure 1. EVL6562A-35WFLB evaluation board using the L6562A
January 2014
DocID15099 Rev 2
1/23
www.st.com
Contents
AN2838
Contents
1
Main characteristics and circuit description . . . . . . . . . . . . . . . . . . . . . 4
2
Electrical diagram and bill of material . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
3
Test results and significant waveforms . . . . . . . . . . . . . . . . . . . . . . . . . 9
3.1
Harmonic content measurement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
4
Thermal measurements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
5
Conducted emission pre-compliance test . . . . . . . . . . . . . . . . . . . . . . 15
6
Burst test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
7
Schematic with output voltage and current loop . . . . . . . . . . . . . . . . . 18
8
Power transformer specification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
9
References . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
10
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
2/23
DocID15099 Rev 2
AN2838
List of figures
List of figures
Figure 1.
Figure 2.
Figure 3.
Figure 4.
Figure 5.
Figure 6.
Figure 7.
Figure 8.
Figure 9.
Figure 10.
Figure 11.
Figure 12.
Figure 13.
Figure 14.
Figure 15.
Figure 16.
Figure 17.
Figure 18.
Figure 19.
Figure 20.
Figure 21.
Figure 22.
Figure 23.
Figure 24.
Figure 25.
Figure 26.
Figure 27.
Figure 28.
EVL6562A-35WFLB evaluation board using the L6562A . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
EVL6562A-35WFLB evaluation board: electrical schematic . . . . . . . . . . . . . . . . . . . . . . . . 6
EVL6562A-35WFLB compliance with EN61000-3-2 Class-C limits @ full load . . . . . . . . . . 9
EVL6562A-35WFLB compliance with JEIDA-MITI Class-C limits @ full load . . . . . . . . . . . 9
Power factor vs. VIN and load . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
EVL6562A-35WFLB input current waveform @100 V-50 Hz - 35 W load . . . . . . . . . . . . . 10
EVL6562A-35WFLB input current waveform @230 V-50 Hz - 35 W load . . . . . . . . . . . . . 10
Efficiency vs. VIN and load . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Static VOUT regulation vs. VIN and IOUT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
EVL6562A-35WFLB output voltage ripple @ 90 VAC - full load . . . . . . . . . . . . . . . . . . . . . 11
EVL6562A-35WFLB output voltage ripple @ 265 VAC - full load . . . . . . . . . . . . . . . . . . . . 11
EVL6562A-35WFLB VDS and ID @ 90 VAC - full load . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
EVL6562A-35WFLB VDS and ID @ 90 VAC - full load - detail. . . . . . . . . . . . . . . . . . . . . . . 11
EVL6562A-35WFLB VDS and ID @ 265 VAC - full load . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
EVL6562A-35WFLB VDS and ID @ 265 VAC - full load - detail. . . . . . . . . . . . . . . . . . . . . . 12
EVL6562A-35WFLB VDS and ID @ 90 VAC - 40 mA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
EVL6562A-35WFLB VDS and ID @ 90 VAC - 40 mA - detail. . . . . . . . . . . . . . . . . . . . . . . . 12
EVL6562A-35WFLB VDS and ID @ 265 VAC - 40 mA . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
EVL6562A-35WFLB VDS and ID @ 265 VAC - 40 mA - detail . . . . . . . . . . . . . . . . . . . . . . 13
Thermal map at 90 VAC - full load. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Thermal map at 265 VAC - full load. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
115 VAC and full load - phase . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
115 VAC and full load - neutral . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
230 VAC and full load - phase . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
230 VAC and full load - neutral . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Burst pulse and characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Electrical schematic with secondary current feedback . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Power transformer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
DocID15099 Rev 2
3/23
23
Main characteristics and circuit description
1
AN2838
Main characteristics and circuit description
The main characteristics of the SMPS evaluation board are:
•
Line voltage range: 90 to 265 VAC
•
Minimum line frequency (fL): 47-63 Hz
•
Regulated output voltage: 48 V
•
Rated output power: 35 W
•
Power factor (load = 50 %): 0.9 minimum
•
Minimum efficiency: 85 % at full load
•
Maximum 2 fL output voltage ripple: 1.5 V pk-pk / 0.39 VRMS
(@VIN = 90 VAC, POUT = 35 W)
•
Maximum ambient temperature: 50 °C
•
Conducted EMI: In acc. with EN55022 Class-B
•
Surge rejection: surge test 2.5 kV
•
Primary to secondary insulation: 4 kV
•
PCB type and size: double-sided, 35 µm, FR-4, 120 x 82 mm
The main feature of this converter is that the input current is almost in phase with the mains
voltage, therefore the power factor is close to unity. This is achieved by the L6562A
controller, which shapes the input current as a sinewave in phase with the mains voltage.
The power supply utilizes a typical flyback converter topology, using a transformer to
provide the required insulation between the primary and secondary side. The converter is
connected after the mains rectifier and the capacitor filter, which in this case is quite small to
avoid damage to the shape of the input current. The flyback switch is represented by the
power MOSFET Q1, and driven by the L6562A.
At startup, the L6562A is powered by the VCC capacitor (C6), which is charged via resistors
R1 and R2. The TR1 auxiliary winding (pins 8-7) generates the VCC voltage, rectified by D4
and R4, that powers the L6562A during normal operation. R3 is also connected to the
auxiliary winding to provide the transformer demagnetization signal to the L6562A ZCD pin,
turning on the MOSFET at any switching cycle. The MOSFET used is the STP5NK80ZFP, a
standard, low-cost 800 V device housed in a TO-220FP package, and needing only a small
heat sink. The transformer is layer type, using a standard ferrite size ETD-29 and is
manufactured by Magnetica. The flyback reflected voltage is ~190 V, providing enough
room for the leakage inductance voltage spike still within the reliability margin of the
MOSFET. The rectifier D2 and the Transil D3 clamp the peak of the leakage inductance
voltage spike at MOSFET turn-off.
The resistors R14 and R15 sense the current flowing into the transformer primary side.
Once the signal at the current sense pin has reached the level programmed by the internal
multiplier of the L6562A, the MOSFET turns off.
The divider R7, R8, R9 and R6 provides to the L6562A multiplier pin with instantaneous
voltage information which is used to modulate the current flowing into the transformer
primary side.
The divider R20 and R21 is dedicated to sensing the output voltage, and capacitor C16 and
diodes D7 and D8 provide a soft-start at turn-on. Output regulation is done by means of an
4/23
DocID15099 Rev 2
AN2838
Main characteristics and circuit description
isolated voltage loop by the optocoupler U2, and using an inexpensive TL431 (U3) to drive
the optocoupler. The opto-transistor modulates the input voltage of the L6562A internal
amplifier, thus closing the voltage loop.
The output rectifier is a fast recovery type, selected according to its maximum reverse
voltage, forward voltage drop and power dissipation. A small LC filter is added on the output,
filtering the high frequency ripple.
The board is equipped with an input EMI filter designed for a 3-wire input mains plug. It is
composed of two, common mode Pi-filter stages connected after the input connector and
the input fuse. A varistor is also connected at the input of the board, improving immunity
against input voltage fast transients.
DocID15099 Rev 2
5/23
23
Electrical diagram and bill of material
2
AN2838
Electrical diagram and bill of material
Figure 2. EVL6562A-35WFLB evaluation board: electrical schematic
6/23
DocID15099 Rev 2
AN2838
Electrical diagram and bill of material
Table 1. Bill of material
Reference
Part value
Type/description
Supplier
C1
2.2 nF
Ceramic Y2
Murata
C2
2.2 nF
Ceramic Y2
Murata
C3
0.22 µF
R.46 275 VAC
Arcotronics
C4
0.1 µF
R.41 MKP Y2/X1 300 VAC
n.d.
C5
220 nF
MKT X2 275 VAC
n.d.
C6
47 µF
35 V
n.d.
C7
100 nF
Ceramic
n.d.
C8
2.2 nF
Ceramic
n.d.
C9
2.2 nF
Ceramic
n.d.
C10
1 nF
Ceramic Y2
Murata
C11
1 nF
Ceramic Y2
Murata
C12
1000 µF
63 V 105 °C YXF
Rubycon
C13
1000 µF
63 V 105 °C YXF
Rubycon
C14
100 nF
Ceramic
n.d.
C15
2200 nF
Ceramic
n.d.
C16
1 µF
100 V
n.d.
C17
4.7 µF
63 V 105°C
Rubycon
C18
0.1 µF
R.41 MKP Y2/X1 300 VAC
n.d.
C19
2.2 nF
Ceramic Y2
Murata
C20
2.2 nF
Ceramic Y2
Murata
C21
2.2 nF
Ceramic Y2
Murata
C22
2.2 nF
Ceramic Y2
Murata
C23
100 nF
Ceramic
n.d.
C24
100 nF
Ceramic
n.d.
D1
800 V, 2 A
2KBP08M diode bridge
n.d.
D2
P6KE300A
Transil
STMicroelectronics
D3
STTH1L06
Rectifier, ultra-fast 1 A, 600 V
STMicroelectronics
D4
1N4448
D5
STTH3R02
Rectifier, ultra-fast 3 A, 200 V
STMicroelectronics
D6
33 V
Zener, 5%
n.d.
D7
1N4448
n.d.
D8
1N4448
n.d.
D9
N.M.
Not mounted
n.d.
F1
2 A, 250 V
Fuse PCB mounting
n.d.
n.d.
DocID15099 Rev 2
7/23
23
Electrical diagram and bill of material
AN2838
Table 1. Bill of material (continued)
8/23
Reference
Part value
Type/description
Supplier
L1
4135
Filter inductor 15 µH/3 A
Magnetica
Q1
STP5NK80ZFP
Power MOSFET, TO-220FP
w/heatsink
STMicroelectronics
R1
150 kΩ
Axial
n.d.
R2
150 kΩ
Axial
n.d.
R3
68 kΩ
Axial
n.d.
R4
10 R
Axial
n.d.
R5
680 kΩ
Axial
n.d.
R6
20 kΩ
Axial
n.d.
R7
1 MΩ
Axial
n.d.
R8
1 MΩ
Axial
n.d.
R9
1 MΩ
Axial
n.d.
R10
0R
shorted
n.d.
R11
47 kΩ
Axial
n.d.
R12
2.2 kΩ
Axial
n.d.
R13
10 Ω
Axial
n.d.
R14
1R0
Axial, precision 5%, ¼ W
n.d.
R15
1R0
Axial, precision 5%, ¼ W
n.d.
R16
12K
Axial
n.d.
R17
3K3
Axial, ¼ W
n.d.
R18
6.8 kΩ
Axial
n.d.
R19
4.7 kΩ
Axial
n.d.
R20
1K5
Axial, precision 1%
n.d.
R21
27 kΩ
Axial, precision 1%
n.d.
R23
100 kΩ
Axial
n.d.
R24
N.M
Not mounted
n.d.
R25
0R
Shorted
T1
3651
Common mode choke 2x18 mH
Magnetica
T2
3651
Common mode choke 2x18 mH
Magnetica
TR1
4126
Switch-mode transformer
Magnetica
U1
L6562A
TM PFC controller
STMicroelectronics
U2
CNY17-3
Optocoupler DIP-6
n.d.
U3
TL431
Voltage reference, TO-92
STMicroelectronics
V1
275 V
VDR 40J (10/1000 µs) 7 mm
n.d.
DocID15099 Rev 2
AN2838
Test results and significant waveforms
3
Test results and significant waveforms
3.1
Harmonic content measurement
One of the main purposes of this converter is the correction of input current distortion,
decreasing the harmonic contents below the limits of the actual regulation. Therefore, the
board has been tested according to the European standard EN61000-3-2 Class-C and
Japanese standard JEIDA-MITI Class-C, at full load and both nominal input voltage mains.
As shown in figures that follow, the circuit is capable of reducing the harmonics well below
the limits of both regulations.
Figure 3. EVL6562A-35WFLB compliance Figure 4. EVL6562A-35WFLB compliance
with EN61000-3-2 Class-C limits @ full with JEIDA-MITI Class-C limits @ full load
load
The power factor (PF) has been measured also and the results are reported in Figure 5. As
shown, the PF remains very close to unity throughout the input voltage mains range.
Figure 5. Power factor vs. VIN and load
The waveforms of the input current and voltage at the nominal input voltage mains and full
load condition are illustrated in Figure 6 and Figure 7.
DocID15099 Rev 2
9/23
23
Test results and significant waveforms
AN2838
Figure 6. EVL6562A-35WFLB input
current waveform @100 V-50 Hz - 35 W
load
Figure 7. EVL6562A-35WFLB input
current waveform @230 V-50 Hz - 35 W
load
The converter’s efficiency has been measured and it is significantly high in all load and line
conditions (see Figure 8). At full load, the efficiency is higher than 85% at any input voltage,
making this design suitable for high efficiency power supplies. Also, at lower output load the
efficiency is better than 82%. At minimum load (40 mA output current) the efficiency is still
good.
Figure 9 reports the output voltage measured under different line and load conditions. As
shown, the voltage regulation over the entire input voltage range is excellent at any output
current level.
Figure 8. Efficiency vs. VIN and load
10/23
DocID15099 Rev 2
Figure 9. Static VOUT regulation vs. VIN
and IOUT
AN2838
Test results and significant waveforms
Figure 10. EVL6562A-35WFLB output
voltage ripple @ 90 VAC - full load
Figure 11. EVL6562A-35WFLB output
voltage ripple @ 265 VAC - full load
In Figure 10 and Figure 11 the output voltage ripple at twice the input mains frequency is
measured. As shown it is less than 0.4 V peak-to-peak, which is ideal for LED or lighting
applications. High frequency noise, including spikes, is significantly reduced as well.
In the following illustrations, the MOSFET drain voltage and current are measured at
different line and maximum loads.
Figure 12. EVL6562A-35WFLB VDS and ID Figure 13. EVL6562A-35WFLB VDS and ID
@ 90 VAC - full load
@ 90 VAC - full load - detail
CH1: drain current - 0.5 A/div
CH1: drain current - 0.5 A/div
CH2: drain voltage - 200 V/div
CH2: drain voltage - 200 V/div
DocID15099 Rev 2
11/23
23
Test results and significant waveforms
AN2838
Figure 14. EVL6562A-35WFLB VDS and ID Figure 15. EVL6562A-35WFLB VDS and ID
@ 265 VAC - full load
@ 265 VAC - full load - detail
CH1: drain current - 0.5 A/div
CH1: drain current - 0.5 A/div
CH2: drain voltage - 200 V/div
CH2: drain voltage - 200 V/div
Figure 14 shows the measurement at the maximum drain voltage of 265 VAC and max load.
In this worst-case condition, the peak drain voltage is 640 VPK, assuring a good margin with
respect to the MOSFET BVDSS and contributing strongly to the reliability and low failure rate
of the design.
Figure 16. EVL6562A-35WFLB VDS and ID Figure 17. EVL6562A-35WFLB VDS and ID
@ 90 VAC - 40 mA
@ 90 VAC - 40 mA - detail
12/23
CH1: drain current - 0.1 A/div
CH1: drain current - 0.1 A/div
CH2: drain voltage - 100 V/div
CH2: drain voltage - 100 V/div
DocID15099 Rev 2
AN2838
Test results and significant waveforms
Figure 18. EVL6562A-35WFLB VDS and ID Figure 19. EVL6562A-35WFLB VDS and ID
@ 265 VAC - 40 mA
@ 265 VAC - 40 mA - detail
CH1: drain current - 0.2 A/div
CH1: drain current - 0.2 A/div
CH2: drain voltage - 200 V/div
CH2: drain voltage - 200 V/div
The above figures show the MOSFET waveforms at light load. Even in this load condition
the waveforms are correct. It can be noted that at high mains the converter works in burst
mode (see Figure 19), keeping efficiency at a good level.
DocID15099 Rev 2
13/23
23
Thermal measurements
4
AN2838
Thermal measurements
To check the reliability of the design, thermal mapping by means of an IR camera was
carried out. Figure 20 and Figure 21 show thermal measurements on the component side of
the board at nominal input voltages and full load. Some pointers visible on the pictures
placed across key components show the relevant temperature. Table 1 provides the
correlation between the measured points and components, for both thermal maps. The
ambient temperature during both measurements was 27 °C. According to these
measurement results, all components on the board function within their temperature limits.
Figure 20. Thermal map at 90 VAC - full
load
Figure 21. Thermal map at 265 VAC - full
load
Table 2. Measured temperature @ 90 VAC and 265 VAC - full load
14/23
Component
Temperature @ 90 VAC
Temperature @ 265 VAC
MOSFET Q1
57.8 °C
43.8 °C
Secondary diode D5
58.9 °C
58.1 °C
Diode bridge D1
65.9 °C
45.6 °C
Transformer TR1 (bobbin)
64.3 °C
65.1 °C
Transformer TR1 (core)
54.5 °C
55 °C
Choke T1
55.7 °C
36. 2 °C
Choke T2
56 °C
38.2 °C
Transil D2
70 °C
59 °C
DocID15099 Rev 2
AN2838
5
Conducted emission pre-compliance test
Conducted emission pre-compliance test
The following images are the peak measurements of the conducted noise at full load and
nominal mains voltages. The limits shown on the diagrams are those of EN55022 Class-B,
which is the most popular standard for domestic equipment. As visible in the diagrams, good
margins with respect to the limits are present in all test conditions.
Figure 22. 115 VAC and full load - phase
Figure 23. 115 VAC and full load - neutral
Figure 24. 230 VAC and full load - phase
Figure 25. 230 VAC and full load - neutral
DocID15099 Rev 2
15/23
23
Burst test
6
AN2838
Burst test
The board has been tested against burst pulses, with good results. The tests have been
carried out using the following equipment and the procedures:
•
Surge generator: Schaffner NSG 200 E 7 NSG 224 A
•
Test types:
•
–
SYM = symmetric with respect to earth pole (pulse applied between line and
neutral)
–
ASYM = asymmetric (pulse applied between line and earth and between neutral
and earth)
Output load 700 mA.
Figure 26. Burst pulse and characteristics
SYM
ASYM
ASYM
16/23
2.5 kV
2.5 kV
2.5 kV
Pulse type
Pulse frequency
Pulse number
(burst)
Pause
Pulse number
(burst)
Pause
Pulse number
(burst)
Pause
Pulse number
(burst)
Pause
2.5 kV
phase
Amplitude
SYM
+ 90°
III
1 Hz
10
15”
10
15”
10
15”
10
15”
Polarity and
Configuration
Table 3. Burst test report table
- 270°
+ 90°
- 270°
III
III
III
1 Hz
1 Hz
1 Hz
10
15”
10
15”
10
15”
10
15”
10
15”
10
15”
10
15”
10
15”
10
15”
10
15”
10
15”
10
15”
10
15”
10
15”
10
15”
10
15”
DocID15099 Rev 2
AN2838
Burst test
•
Test passed with a total of 200 pulses applied and a medium energy of 80 mJ (when
connected to a 50 Ω load).
DocID15099 Rev 2
17/23
23
Schematic with output voltage and current loop
7
AN2838
Schematic with output voltage and current loop
All tests described in this document have been done using the schematic in Figure 1 and
using a TL431 for the output voltage feedback. If a secondary current loop is also needed,
the schematic below can be implemented on the PCB by making the modifications listed in
Table 4.
The proposed schematic has been designed to drive LEDs with a current rating of 700 mA.
For correct board functionality the minimum output voltage when the current loop is working
is around 30 V. Therefore, the minimum number of LEDs in series that can be connected to
the output must be calculated according to this minimum output voltage value.
Figure 27. Electrical schematic with secondary current feedback
18/23
DocID15099 Rev 2
AN2838
Schematic with output voltage and current loop
Table 4. Modification list for TSM1052 implementation
Reference
Part value
Modification
C15
Type/
Description
Removed
C16
100 nF
Changed value
Ceramic
C25
2.2 nF
Added
Ceramic
C26
220 nF
Added
Ceramic
C27
10 nF
Added
Ceramic
D6
12 V
Changed value
Zener, 5%
R4
22 R
Changed value
Axial
R16
10 kΩ
Changed value
Axial
R18
Removed
R19
Removed
R20
5K6
Changed value
Axial, precision 1%
R21
220 kΩ
Changed value
Axial, precision 1%
R25
0R27
Added
Axial 2 W
R26
100 kΩ
Added
Axial
R27
4K7
Added
Axial
R30
4K7
Added
Axial
R100
470R
Mounted by reworking of PCB
Axial
J1
JUMPER
Added
Wire jumper
U3
U4
Removed
TSM1052
STMicroelectronics
Added
DocID15099 Rev 2
Current/voltage controller
19/23
23
Power transformer specification
8
AN2838
Power transformer specification
•
Transformer type: open
–
Winding type: layer
–
Coil former: vertical type, 6 + 6 pins
–
Mains insulation: 4 kV
–
Unit finishing: varnished
Electrical characteristics (all measurements taken with pins 10 and 11 shorted)
•
Converter topology: flyback, TM mode
•
Core type: ETD29
•
Min. operating frequency: 36 kHz
•
Primary inductance: 550 mH 10% @ 1 kHz - 0.25 V (a)
•
Leakage inductance: 4.5 mH@ 50 kHz - 0.25 V (b)
•
Parasitic capacitance: 7 pF max.
•
Max. peak primary current: 1.9 APK
•
Turn ratio:
–
Pin 9-12 / 8-7: 10.55 ± 5%
–
Pin 9-12 / 5/4-3/2: 3.8 ± 5%
Figure 28. Power transformer
Manufacturer: Magnetica
P/N: 4126
a. Measured between pins (9-12)
b. Measured between pins (9-12) with all secondary windings shorted
20/23
DocID15099 Rev 2
AN2838
9
References
References
•
L6562A transition-mode PFC controller datasheet
•
Application note AN1059: Design equations of high-power-factor flyback converters
based on the L6561
•
Application note AN1060: Flyback converters with the L6561 PFC controller
DocID15099 Rev 2
21/23
23
Revision history
10
AN2838
Revision history
Table 5. Document revision history
22/23
Date
Revision
Changes
12-Nov-2008
1
Initial release
20-Jan-2014
2
– Updated Figure 2, Table 1, Figure 27 and Chapter 8
– Modified board nomenclature
DocID15099 Rev 2
AN2838
Please Read Carefully:
Information in this document is provided solely in connection with ST products. STMicroelectronics NV and its subsidiaries (“ST”) reserve the
right to make changes, corrections, modifications or improvements, to this document, and the products and services described herein at any
time, without notice.
All ST products are sold pursuant to ST’s terms and conditions of sale.
Purchasers are solely responsible for the choice, selection and use of the ST products and services described herein, and ST assumes no
liability whatsoever relating to the choice, selection or use of the ST products and services described herein.
No license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted under this document. If any part of this
document refers to any third party products or services it shall not be deemed a license grant by ST for the use of such third party products
or services, or any intellectual property contained therein or considered as a warranty covering the use in any manner whatsoever of such
third party products or services or any intellectual property contained therein.
UNLESS OTHERWISE SET FORTH IN ST’S TERMS AND CONDITIONS OF SALE ST DISCLAIMS ANY EXPRESS OR IMPLIED
WARRANTY WITH RESPECT TO THE USE AND/OR SALE OF ST PRODUCTS INCLUDING WITHOUT LIMITATION IMPLIED
WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE (AND THEIR EQUIVALENTS UNDER THE LAWS
OF ANY JURISDICTION), OR INFRINGEMENT OF ANY PATENT, COPYRIGHT OR OTHER INTELLECTUAL PROPERTY RIGHT.
ST PRODUCTS ARE NOT DESIGNED OR AUTHORIZED FOR USE IN: (A) SAFETY CRITICAL APPLICATIONS SUCH AS LIFE
SUPPORTING, ACTIVE IMPLANTED DEVICES OR SYSTEMS WITH PRODUCT FUNCTIONAL SAFETY REQUIREMENTS; (B)
AERONAUTIC APPLICATIONS; (C) AUTOMOTIVE APPLICATIONS OR ENVIRONMENTS, AND/OR (D) AEROSPACE APPLICATIONS
OR ENVIRONMENTS. WHERE ST PRODUCTS ARE NOT DESIGNED FOR SUCH USE, THE PURCHASER SHALL USE PRODUCTS AT
PURCHASER’S SOLE RISK, EVEN IF ST HAS BEEN INFORMED IN WRITING OF SUCH USAGE, UNLESS A PRODUCT IS
EXPRESSLY DESIGNATED BY ST AS BEING INTENDED FOR “AUTOMOTIVE, AUTOMOTIVE SAFETY OR MEDICAL” INDUSTRY
DOMAINS ACCORDING TO ST PRODUCT DESIGN SPECIFICATIONS. PRODUCTS FORMALLY ESCC, QML OR JAN QUALIFIED ARE
DEEMED SUITABLE FOR USE IN AEROSPACE BY THE CORRESPONDING GOVERNMENTAL AGENCY.
Resale of ST products with provisions different from the statements and/or technical features set forth in this document shall immediately void
any warranty granted by ST for the ST product or service described herein and shall not create or extend in any manner whatsoever, any
liability of ST.
ST and the ST logo are trademarks or registered trademarks of ST in various countries.
Information in this document supersedes and replaces all information previously supplied.
The ST logo is a registered trademark of STMicroelectronics. All other names are the property of their respective owners.
© 2014 STMicroelectronics - All rights reserved
STMicroelectronics group of companies
Australia - Belgium - Brazil - Canada - China - Czech Republic - Finland - France - Germany - Hong Kong - India - Israel - Italy - Japan Malaysia - Malta - Morocco - Philippines - Singapore - Spain - Sweden - Switzerland - United Kingdom - United States of America
www.st.com
DocID15099 Rev 2
23/23
23
Similar pages