MP8775EL-LF-Z [MPS]
Switching Regulator, Current-mode, 5A, 500kHz Switching Freq-Max, PDSO14, 3 X 4 MM, ROHS COMPLIANT, MO-229VGED-3, QFN-14;
| 型号： | MP8775EL-LF-Z |
| 厂家： | 
MONOLITHIC POWER SYSTEMS |
| 描述： | Switching Regulator, Current-mode, 5A, 500kHz Switching Freq-Max, PDSO14, 3 X 4 MM, ROHS COMPLIANT, MO-229VGED-3, QFN-14 光电二极管 |
| 文件： | 总14页 (文件大小：523K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
MP8775
Monolithic 5A/23V, 500kHz
Synchronous Step-down Converter
The Future of Analog IC Technology
DESCRIPTION
FEATURES
The MP8775 is a monolithic high frequency
synchronous rectified step-down switch mode
converter with built in internal power MOSFETs.
It offers a very compact solution to achieve
more than 5A output current over a wide input
supply range with excellent load and line
regulation. The integrated low side FET
achieves 19mΩ for high efficiency. The
MP8775 operates at high efficiency over a wide
output current load range.
•
•
•
•
Wide 4.5 to 23V Operating Input Range
5A Output Current
19mΩ LS FET
Proprietary Switching Loss Reduction
Technique
Fixed 500kHz Switching Frequency
Internal Compensation
OCP Protection and Thermal Shutdown
Output Adjustable from 0.8V
Available in 14-pin QFN3x4 and SOIC8E
packages
•
•
•
•
•
Current mode operation provides fast transient
response and eases loop stabilization. The
device also uses proprietary AAM operation for
high efficiency.
APPLICATIONS
•
•
•
•
•
•
Notebook Systems and I/O Power
Networking Systems
Digital Set Top Boxes
Personal Video Recorders
Flat Panel Television and Monitors
Distributed Power Systems
Full protection features include OCP and thermal
shut down.
The MP8775 is available in space saving 3mm x
4mm 14-pin QFN and 8 pin SOIC with exposed
pad packages.
“MPS” and “The Future of Analog IC Technology” are Registered Trademarks of
Monolithic Power Systems, Inc.
The information in this datasheet about the product and its associated
technologies are proprietary and intellectual property of Monolithic Power
Systems and are protected by copyright and pending patent applications.
TYPICAL APPLICATION
MP8775 Rev. 0.94
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MP8775 – 23V, SYNCHRONOUS STEP-DOWN CONVERTER WITH INTERNAL MOSFETS
ORDERING INFORMATION
Part Number
MP8775EL*
MP8775EN**
Package
3x4 QFN14
SOIC8E
Top Marking
8775
MP8775EN
Free Air Temperature (TA)
-20°C to +85°C
-20°C to +85°C
* For Tape & Reel, add suffix –Z (e.g. MP8775EL–Z);
For RoHS compliant packaging, add suffix –LF; (e.g. MP8775EL–LF–Z)
** For Tape & Reel, add suffix –Z (e.g. MP8775EN–Z);
For RoHS compliant packaging, add suffix –LF; (e.g. MP8775EN–LF–Z)
PACKAGE REFERENCE
TOP VIEW
IN
SW
SW
SW
SW
BST
EN
1
2
3
4
5
6
7
14 AGND
TOP VIEW
13 GND
VIN
SW
BST
EN
1
2
3
4
8
7
6
5
GND
VCC
AAM
FB
12 GND
11 VCC
AAM
PG
10
9
EXPOSED PAD
ON BACKSIDE
FB
8
EXPOSED PAD
ON BACKSIDE
3x4 QFN14
SOIC8E
Thermal Resistance (4)
3x4 QFN14.............................48......11.....°C/W
SOIC8 (Exposed Pad) ............50......10 ....°C/W
θJA θJC
ABSOLUTE MAXIMUM RATINGS (1)
Supply Voltage VIN .......................................25V
VSW ..........................-0.3V (-5V for 10ns) to 25V
VBS ..................................................... VSW + 6V
All Other Pins................................. -0.3V to +6V
Continuous Power Dissipation
…………………………………………………2.6W
Junction Temperature..............................150°C
Lead Temperature ...................................260°C
Storage Temperature...............-65°C to +150°C
Notes:
1) Exceeding these ratings may damage the device.
2) The maximum allowable power dissipation is a function of the
(TA = +25°C) (2)
maximum junction temperature TJ
ambient thermal resistance θJA, and the ambient temperature
TA. The maximum allowable continuous power dissipation at
any ambient temperature is calculated by PD (MAX) = (TJ (MAX)
TA) /θJA. Exceeding the maximum allowable power dissipation
will cause excessive die temperature, and the regulator will
go into thermal shutdown. Internal thermal shutdown circuitry
protects the device from permanent damage.
, the junction-to-
(MAX)
-
Recommended Operating Conditions (3)
Supply Voltage VIN .......................... 4.5V to 23V
Operating Junct. Temp (TJ)......-20°C to +125°C
3) The device is not guaranteed to function outside of its
operating conditions.
4) Measured on JESD51-7, 4-layer PCB.
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MP8775 – 23V, SYNCHRONOUS STEP-DOWN CONVERTER WITH INTERNAL MOSFETS
ELECTRICAL CHARACTERISTICS
VIN = 12V, TA = +25°C, unless otherwise noted.
Parameters
Symbol
IIN
Condition
Min
Typ
0
Max
Units
μA
Supply Current (Shutdown)
Supply Current (Quiescent)
HS Switch On Resistance (5)
LS Switch On Resistance (5)
VEN = 0V
IIN
VEN = 2V, VFB = 1V
1
mA
HSRDS-ON
LSRDS-ON
110
19
mꢀ
mꢀ
VEN = 0V, VSW = 0V or
12V
Switch Leakage
SWLKG
0
5
μA
Current Limit
ILIMIT
FSW
FFB
8
A
kHz
fSW
%
Oscillator Frequency
Fold-back Frequency
Maximum Duty Cycle
Feedback Voltage
Feedback Current
EN Input Low Voltage
EN Input High Voltage
EN Input Current
VFB = 0.75V
VFB = 100mV
VFB = 700mV
350
500
0.25
90
650
DMAX
VFB
85
785
805
10
825
50
mV
nA
V
IFB
VFB = 800mV
VILEN
VIHEN
IEN
0.4
2
V
VEN = 2V
VEN = 0V
2
0
μA
EN Input Current
EN Turn Off Delay
ENTd-Off
PGVth-Hi
PGVth-Lo
PGTd
5
μsec
VFB
VFB
μs
Power Good Rising Threshold
Power Good Falling Threshold
Power Good Delay
0.9
0.7
250
Power Good Sink Current
Capability
VPG
Sink 4mA
0.4
10
V
nA
V
Power Good Leakage Current
IPG_LEAK
INUVVth
VPG = 3.3V
VIN Under Voltage Lockout
Threshold Rising
3.8
4.0
4.2
VIN Under Voltage Lockout
Threshold Hysteresis
INUVHYS
VCC
880
mV
VCC Regulator
5
5
V
%
°C
VCC Load Regulation
Thermal Shutdown
Icc=5mA
TSD
150
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MP8775 – 23V, SYNCHRONOUS STEP-DOWN CONVERTER WITH INTERNAL MOSFETS
PIN FUNCTIONS
Pin #
QFN14 SOIC8E
Pin #
Name Description
Supply Voltage. The MP8775 operates from a +4.5V to +23V input rail. C1 is
1
1
IN
needed to decouple the input rail. Use wide PCB traces and multiple vias to make
the connection.
2,3,4,5
2
3
4
SW
BST
EN
Switch Output. Use wide PCB traces and multiple vias to make the connection.
Bootstrap. A capacitor connected between SW and BST pins is required to form a
floating supply across the high-side switch driver.
6
7
EN=1 to enable the MP8775.
Feedback. An external resistor divider from the output to GND, tapped to the FB pin,
sets the output voltage. To prevent current limit run away during a short circuit fault
condition the frequency fold-back comparator lowers the oscillator frequency when
the FB voltage is below 200mV.
8
9
5
FB
Power Good Output, the output of this pin is open drain. Power good threshold is
90% low to high with typical 250μs delay and 70% high to low of regulation value.
--
PG
Connects to a voltage set by 2 resistor dividers forces MP8775 into non-
synchronous mode when load is small.
10
11
6
7
8
AAM
VCC Bias Supply. Decouple with 0.1µF capacitor.
System Ground. This pin is the reference ground of the regulated output voltage.
For this reason care must be taken in PCB layout.
12,13
GND
Ground. Connect these pins with larger copper areas to the negative terminals of
AGND the input and output capacitors. Connect exposed pad to GND plane for proper
thermal performance.
14
--
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MP8775 – 23V, SYNCHRONOUS STEP-DOWN CONVERTER WITH INTERNAL MOSFETS
TYPICAL PERFORMANCE CHARACTERISTICS
VIN=12V, VOUT =1.8V, L=1.0µH, TA=+25°C, unless otherwise noted.
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MP8775 – 23V, SYNCHRONOUS STEP-DOWN CONVERTER WITH INTERNAL MOSFETS
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
VIN=12V, VOUT =1.8V, L=1.0µH, TA=+25°C, unless otherwise noted.
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MP8775 – 23V, SYNCHRONOUS STEP-DOWN CONVERTER WITH INTERNAL MOSFETS
BLOCK DIAGRAM
IN
+
-
VCC
Regulator
RSEN
Drive
Currrent Sense
Amplifer
VCC
Boost
BST
SW
Regulator
PG
EN
Oscillator
+
-
250us
Delay
HS
Driver
PG Comparator
+
-
Comparator
On Time Control
Logic Control
1pF
VCC
Current Limit
Comparator
50pF
400k
Reference
LS
Driver
1MEG
+
+
-
FB
GND
Error Amplifier
AAM
Figure 1—Functional Block Diagram
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MP8775 – 23V, SYNCHRONOUS STEP-DOWN CONVERTER WITH INTERNAL MOSFETS
OPERATION
The MP8775 is a high frequency synchronous
rectified step-down switch mode converter with
built in internal power MOSFETs. It offers a very
compact solution to achieve more than 5A
continuous output current over a wide input
supply range with excellent load and line
regulation.
Under-Voltage Lockout (UVLO)
Under-voltage lockout (UVLO) is implemented to
protect the chip from operating at insufficient
supply voltage. The MP8775 UVLO comparator
monitors the output voltage of the internal
regulator, VCC. The UVLO rising threshold is
about 4.0V while its falling threshold is a
consistent 3.2V.
The MP8775 operates in a fixed frequency, peak
current control mode to regulate the output
voltage. A PWM cycle is initiated by the internal
clock. The integrated high-side power MOSFET
is turned on and remains on until its current
reaches the value set by the COMP voltage.
When the power switch is off, it remains off until
the next clock cycle starts. If, in 90% of one PWM
period, the current in the power MOSFET does
not reach the COMP set current value, the power
MOSFET will be forced to turn off.
Internal Soft-Start
The soft-start is implemented to prevent the
converter output voltage from overshooting
during startup. When the chip starts, the internal
circuitry generates a soft-start voltage (SS)
ramping up from 0V to 1.2V. When it is lower
than the internal reference (REF), SS overrides
REF so the error amplifier uses SS as the
reference. When SS is higher than REF, REF
regains control.
Error Amplifier
Over-Current-Protection and Latch off
The MP8775 has cycle-by-cycle over current limit
when the inductor current peak value exceeds
the set current limit threshold.
When output voltage drops below 70% of the
reference, and inductor current exceeds the
current limit at the meantime, MP8775 will be
latched off. This is especially useful to ensure
system safety under fault condition. The MP8775
clears the latch once the EN or input power is
recycled.
The error amplifier compares the FB pin voltage
with the internal 0.8V reference (REF) and
outputs a current proportional to the difference
between the two. This output current is then used
to charge or discharge the internal compensation
network to form the COMP voltage, which is used
to control the power MOSFET current. The
optimized
internal
compensation
network
minimizes the external component counts and
simplifies the control loop design.
The latch-off function is disabled during soft-start
duration.
Internal Regulator
Most of the internal circuitries are powered from
the 5V internal regulator. This regulator takes the
VIN input and operates in the full VIN range.
When VIN is greater than 5.0V, the output of the
regulator is in full regulation. When VIN is lower
than 5.0V, the output decreases, a 0.1uF ceramic
capacitor for decoupling purpose is required.
Thermal Shutdown
Thermal shutdown is implemented to prevent the
chip from operating at exceedingly high
temperatures. When the silicon die temperature
is higher than 150°C, it shuts down the whole
chip. When the temperature is lower than its
lower threshold, typically 140°C, the chip is
enabled again.
Enable
The MP8775 has a dedicated Enable pin (EN).
By pulling it high or low, the IC can be enabled
and disabled by EN. Tie EN to VIN through a
resistor for automatic start up. To disable the part,
EN must be pulled low for at least 5µs.
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MP8775 – 23V, SYNCHRONOUS STEP-DOWN CONVERTER WITH INTERNAL MOSFETS
Floating Driver and Bootstrap Charging
Startup and Shutdown
The floating power MOSFET driver is powered by
an external bootstrap capacitor. This floating
driver has its own UVLO protection. This UVLO’s
rising threshold is 2.2V with a hysteresis of
150mV. The bootstrap capacitor voltage is
regulated internally by VIN through D1, M1, C4,
L1 and C2 (Figure 2). If (VIN-VSW) is more than
5V, U1 will regulate M1 to maintain a 5V BST
voltage across C4.
If both VIN and EN are higher than their
appropriate thresholds, the chip starts. The
reference block starts first, generating stable
reference voltage and currents, and then the
internal regulator is enabled. The regulator
provides stable supply for the remaining
circuitries.
Three events can shut down the chip: EN low,
VIN low and thermal shutdown. In the shutdown
procedure, the signaling path is first blocked to
avoid any fault triggering. The COMP voltage and
the internal supply rail are then pulled down. The
floating driver is not subject to this shutdown
command.
D1
V
IN
M1
BST
U1
5V
C4
V
OUT
C2
SW
L1
Figure 2—Internal Bootstrap Charging Circuit
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MP8775 – 23V, SYNCHRONOUS STEP-DOWN CONVERTER WITH INTERNAL MOSFETS
APPLICATION INFORMATION
Setting the Output Voltage
Choose inductor current to be approximately
30% of the maximum load current The maximum
inductor peak current is:
The external resistor divider is used to set the
output voltage (see Typical Application on page
1). The feedback resistor R1 also sets the
feedback loop bandwidth with the internal
compensation capacitor (see Typical Application
on page 1). Choose R1 to be around 10kꢀ for
optimal transient response. R2 is then given by:
ΔIL
2
IL(MAX) = ILOAD
+
Under light load conditions below 100mA, larger
inductance is recommended for improved
efficiency.
R1
R2 =
VOUT
Setting the AAM Voltage
− 1
0.8V
The AAM voltage is used to setting the transition
point from AAM to CCM. It should be chosen to
provide the best combination of efficiency,
stability, ripple, and transient.
The T-type network is highly recommended, as
Figure 3 shows.
R1
RT
8
If the AAM voltage is set lower, then stability and
ripple improves, but efficiency during AAM mode
and transient degrades. Likewise, if the AAM
voltage is set higher, then the efficiency during
AAM and transient improves, but stability and
ripple degrades. So the optimal balance point of
AAM voltage for good efficiency, stability, ripple
and transient should be found out.
FB
VOUT
R2
Figure 3— T-type Network
Table 1 lists the recommended T-type resistors
value for common output voltages.
As figure 4 show, AAM voltage can get from VCC
(5V) pin by using a resistor divider.
Table 1—Resistor Selection for Common
Output Voltages
VCC (5V)
VOUT (V)
1.05
1.2
R1 (kΩ)
3.09(1%)
4.99(1%)
10(1%)
10(1%)
10(1%)
10(1%)
R2 (kΩ)
10(1%)
10(1%)
Rt (kΩ)
24.9(1%)
24.9(1%)
R3
AAM
1.8
8.06(1%) 24.9(1%)
4.75(1%) 24.9(1%)
3.16(1%) 24.9(1%)
1.91(1%) 24.9(1%)
R4
2.5
3.3
5
Figure 4— AAM Network
Selecting the Inductor
The optimized AAM can be got from Figure 5.
Generally, choose R4 to be around 10 kꢀ, R3 is
then given by:
A 1µH to 10µH inductor with a DC current rating
of at least 25% percent higher than the maximum
load current is recommended for most
applications. For highest efficiency, the inductor
DC resistance should be less than 15mꢀ. For
most designs, the inductance value can be
derived from the following equation.
VCC
R3 = R4(
−1)
AAM
VOUT ×(V − VOUT
)
IN
L1 =
V × ΔIL × fOSC
IN
Where ΔIL is the inductor ripple current.
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MP8775 – 23V, SYNCHRONOUS STEP-DOWN CONVERTER WITH INTERNAL MOSFETS
1.0
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0.0
input voltage ripple caused by capacitance can
be estimated by:
V =3.3V
O
V =5V
O
⎛
⎞
⎟
⎠
ILOAD
VOUT
VOUT
ΔV
=
×
× 1−
⎜
IN
V =1.8V
O
fS ×C1
V
IN
V
IN
⎝
Selecting the Output Capacitor
The output capacitor (C2) is required to maintain
the DC output voltage. Ceramic, tantalum, or low
ESR electrolytic capacitors are recommended.
Low ESR capacitors are preferred to keep the
output voltage ripple low. The output voltage
ripple can be estimated by:
V =1.05V
O
0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0
⎛
⎞ ⎛
VOUT
⎞
⎟
⎠
VOUT
1
Figure 5— AAM Selection for Common
Output Voltages (VIN=7V-23V)
ΔVOUT
=
× 1−
× R
⎟ ⎜
+
⎜
ESR
fS ×L1
V
8× fS ×C2
⎝
IN ⎠ ⎝
Where L1 is the inductor value and RESR is the
equivalent series resistance (ESR) value of the
output capacitor.
Selecting the Input Capacitor
The input current to the step-down converter is
discontinuous, therefore a capacitor is required to
supply the AC current to the step-down converter
while maintaining the DC input voltage. Use low ESR
capacitors for the best performance. Ceramic
capacitors with X5R or X7R dielectrics are highly
recommended because of their low ESR and
small temperature coefficients. For most
applications, a 22µF capacitor is sufficient.
In the case of ceramic capacitors, the impedance
at the switching frequency is dominated by the
capacitance. The output voltage ripple is mainly
caused by the capacitance. For simplification, the
output voltage ripple can be estimated by:
VOUT
8× fS2 ×L1 ×C2
⎛
VOUT
⎞
⎟
⎠
ΔVOUT
=
× 1−
⎜
V
⎝
IN
Since the input capacitor (C1) absorbs the input
switching current it requires an adequate ripple
current rating. The RMS current in the input capacitor
can be estimated by:
In the case of tantalum or electrolytic capacitors,
the ESR dominates the impedance at the
switching frequency. For simplification, the output
ripple can be approximated to:
⎛
⎞
⎟
VOUT
VIN
VOUT
VIN
⎜
IC1 = ILOAD
×
× 1−
⎜
⎝
⎟
⎠
VOUT
VOUT
⎛
⎞
ΔVOUT
=
× 1−
×RESR
⎜
⎟
⎠
fS ×L1
V
IN
⎝
The worse case condition occurs at VIN = 2VOUT
where:
,
The characteristics of the output capacitor also
affect the stability of the regulation system. The
MP8775 can be optimized for a wide range of
capacitance and ESR values.
ILOAD
IC1
=
2
For simplification, choose the input capacitor
whose RMS current rating greater than half of the
maximum load current.
The input capacitor can be electrolytic, tantalum
or ceramic. When using electrolytic or tantalum
capacitors,
a
small, high quality ceramic
capacitor, i.e. 0.1μF, should be placed as close
to the IC as possible. When using ceramic
capacitors, make sure that they have enough
capacitance to provide sufficient charge to
prevent excessive voltage ripple at input. The
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MP8775 – 23V, SYNCHRONOUS STEP-DOWN CONVERTER WITH INTERNAL MOSFETS
External Bootstrap Diode
An external bootstrap diode may enhance the
efficiency of the regulator, the applicable
conditions of external BST diode are:
GND
C1
1
2
3
4
PGND
8
7
6
5
IN
SW
BST
EN
z VOUT is 5V or 3.3V; and
C3
R3
VCC
AAM
VOUT
z Duty cycle is high: D=
>65%
C4
VIN
Rt
FB
In these cases, an external BST diode is
recommended from the VCC pin to BST pin, as
shown in Figure 6.
R1
L1
External BST Diode
IN4148
BST
VCC
C2
CBST
MP8775
SW
L
COUT
Top Layer
Figure 6—Add Optional External Bootstrap
Diode to Enhance Efficiency
The recommended external BST diode is IN4148,
and the BST cap is 0.1~1μF.
PC Board Layout
The high current paths (GND, IN and SW) should
be placed very close to the device with short,
direct and wide traces. The input capacitor needs
to be as close as possible to the IN and GND
pins. The external feedback resistors should be
placed next to the FB pin. Keep the switching
node SW short and away from the feedback
network.
Bottom Layer
Figure 7—PCB Layout
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MP8775 – 23V, SYNCHRONOUS STEP-DOWN CONVERTER WITH INTERNAL MOSFETS
PACKAGE INFORMATION
3mm x 4mm QFN14
1.60
1.80
2.90
3.10
0.30
0.50
PIN 1 ID
SEE DETAIL A
PIN 1 ID
MARKING
1
14
0.18
0.30
3.20
3.40
3.90
4.10
PIN 1 ID
INDEX AREA
0.50
BSC
8
7
TOP VIEW
BOTTOM VIEW
PIN 1 ID OPTION A
0.30x45º TYP.
PIN 1 ID OPTION B
R0.20 TYP.
0.80
1.00
0.20 REF
0.00
0.05
SIDE VIEW
DETAIL A
2.90
1.70
NOTE:
0.70
1) ALL DIMENSIONS ARE IN MILLIMETERS.
2) EXPOSED PADDLE SIZE DOES NOT INCLUDE MOLD FLASH.
3) LEAD COPLANARITY SHALL BE0.10 MILLIMETER MAX.
4) JEDEC REFERENCE IS MO-229, VARIATION VGED-3.
5) DRAWING IS NOT TO SCALE.
0.25
0.50
3.30
RECOMMENDED LAND PATTERN
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MP8775 – 23V, SYNCHRONOUS STEP-DOWN CONVERTER WITH INTERNAL MOSFETS
PACKAGE INFORMATION
SOIC8E (EXPOSED PAD)
0.189(4.80)
0.197(5.00)
0.124(3.15)
0.136(3.45)
8
5
0.150(3.80)
0.157(4.00)
0.228(5.80)
0.244(6.20)
0.089(2.26)
0.101(2.56)
PIN 1 ID
1
4
TOP VIEW
BOTTOM VIEW
SEE DETAIL "A"
0.051(1.30)
0.067(1.70)
SEATING PLANE
0.000(0.00)
0.006(0.15)
0.0075(0.19)
0.0098(0.25)
0.013(0.33)
0.020(0.51)
SIDE VIEW
0.050(1.27)
BSC
FRONT VIEW
0.010(0.25)
0.020(0.50)
x 45o
GAUGE PLANE
0.010(0.25) BSC
0.050(1.27)
0.024(0.61)
0.063(1.60)
0.016(0.41)
0.050(1.27)
0o-8o
DETAIL "A"
0.103(2.62)
0.213(5.40)
NOTE:
1) CONTROL DIMENSION IS IN INCHES. DIMENSION IN
BRACKET IS IN MILLIMETERS.
2) PACKAGE LENGTH DOES NOT INCLUDE MOLD FLASH,
PROTRUSIONS OR GATE BURRS.
3) PACKAGE WIDTH DOES NOT INCLUDE INTERLEAD FLASH
OR PROTRUSIONS.
0.138(3.51)
4) LEAD COPLANARITY (BOTTOM OF LEADS AFTER FORMING)
SHALL BE 0.004" INCHES MAX.
5) DRAWING CONFORMS TO JEDEC MS-012, VARIATION BA.
6) DRAWING IS NOT TO SCALE.
RECOMMENDED LAND PATTERN
NOTICE: The information in this document is subject to change without notice. Please contact MPS for current specifications.
Users should warrant and guarantee that third party Intellectual Property rights are not infringed upon when integrating MPS
products into any application. MPS will not assume any legal responsibility for any said applications.
MP8775 Rev. 0.94
12/10/2013
www.MonolithicPower.com
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2013 MPS. All Rights Reserved.
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