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PDF MP6003 Data sheet ( Hoja de datos )
| Número de pieza | MP6003 | |
| Descripción | Monolithic Flyback/SEPIC DC-DC Converter | |
| Fabricantes | MPS | |
| Logotipo |  |
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The Future of Analog IC Technology
DESCRIPTION
The MP6003 is a monolithic flyback DC-DC
converter which includes a 150V power switch
and is capable of delivering up to 15W output
power. It can also be used for SEPIC boost and
Flyback and Forward applications.
The MP6003 uses the fixed-frequency peak
current mode primary controller architecture. It
has an internal soft-start, auto-retry, and
incorporates over current, short circuit, and
over-voltage protection. The MP6003 can also
skip cycles to maintain zero load regulation.
It has a direct optocoupler interface which
bypasses the internal error amplifier when an
isolated output is desired.
The MP6003 is ideal for telecom applications,
and is available in a compact, thermally
enhanced SOIC8 package with an exposed pad.
TYPICAL APPLICATION
MP6003
Monolithic Flyback/SEPIC
DC-DC Converter
FEATURES
• Integrated 0.9Ω 150V Power Switch
• Cycle-by-Cycle Current Limiting
• Programmable Switching Frequency
• Duty Cycle Limiting with Line Feed Forward
• Integrated 100V Startup Circuit
• Internal Slope Compensation
• Disable Function
• Built-in Soft-Start
• Line Under Voltage Lockout
• Line Over Voltage Protection
• Auto-Restart for Opened/Shorted Output
• Zero Load Regulation
• Thermal Shutdown
APPLICATIONS
• Telecom Equipment
• VoIP Phones, Power over Ethernet (PoE)
• Distributed Power Conversion
All MPS parts are lead-free and adhere to the RoHS directive. For MPS green
status, please visit MPS website under Products, Quality Assurance page.
“MPS” and “The Future of Analog IC Technology” are registered trademarks of
Monolithic Power Systems, Inc.
MP6003 Rev. 1.01
www.MonolithicPower.com
1/26/2014
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2014 MPS. All Rights Reserved.
1
1 page  
MP6003 – MONOLITHIC FLYBACK/SEPIC DC-DC CONVERTER
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
Performance waveforms are tested on the evaluation board of the Design Example section.
VIN = 36V, VOUT = 5V, IOUT = 1A, TA = 25ºC, unless otherwise noted.
MP6003 Rev. 1.01
www.MonolithicPower.com
1/26/2014
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2014 MPS. All Rights Reserved.
5
5 Page 
MP6003 – MONOLITHIC FLYBACK/SEPIC DC-DC CONVERTER
2. Ripple Factor of the Magnetizing Current
The conduction loss in S, D2, the transformer,
the snubber, and in the ESR of the input/output
capacitors will increase as the ripple of the
magnetizing current increases. The ripple factor
(Kr) is defined as the ratio of the peak-to-peak
ripple current vs. the average current as shown
in Figure 3.
Kr
=
ΔIM
IM
Where IM can be derived either from input or
output current;
IM
=
IIN
D
=
I0
N × (1 − D)
ID2/N
IM
IM
0 DTS
TS
Figure 3—Magnetic Current of Flyback
Transformer (Reflected to Primary Side)
The input/output ripple voltage will also
increase with a high ripple factor, which makes
the filter bigger and more expensive. On the
other hand, it can help to minimize the turn-on
loss of S and reverse-recovery loss due to D2.
With nominal input voltage, Kr can be selected
at 60%~120% for most DC-DC converters.
The primary side (or magnetizing) inductance
can be determined by:
LF
=
VIN × D × TS
K r × IM
3. Core Selection
Pick a core based on experience or through a
catalog (Refer to http://www.ferroxcube.com).
Select an ER, EQ, PQ, or RM core to minimize
the transformer’s leakage inductance.
4. Winding Selection
Solid wire, Litz wire, PCB winding, Flex PCB
winding or any combination thereof can be used
as transformer winding. For low current
applications, solid wire is the most cost effective
choice. Consider using several wires in parallel
and interleaving the winding structure for better
performance of the transformer.
The number of primary turns can be determined
by:
NP
=
LF × IP
BMAX × A E
Where BMAX is the allowed maximum flux
density (usually below 300mT) and AE is the
effective area of the core.
The air gap can be estimated by:
Gap
=
μo
× N2
LF
×
AE
5. Right Half Plane Zero
A Flyback converter operating in continuous
mode has a right half plane (RHP) zero. In the
frequency domain, this RHP zero adds not only
a phase lag to the control characteristics but
also increases the gain of the circuit. Typical
rule of thumb states that the highest usable
loop crossover frequency is limited to one third
the value of the RHP zero. The expression for
the location of the RHP zero in a continuous
mode flyback is given by:
fRHPZ
= RLOAD
×
(1 − D)2
2π × LF ×
D
×
N2
Where RLOAD is the load resistance, LF is the
magnetizing inductance on transformer primary
side, and N is the transformer’s turn ratio.
Reducing the primary inductance increases the
RHP zero frequency which results in higher
crossover frequencies.
MP6003 Rev. 1.01
www.MonolithicPower.com
1/26/2014
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2014 MPS. All Rights Reserved.
11
11 Page | ||
| Páginas | Total 15 Páginas | |
| PDF Descargar | [ Datasheet MP6003.PDF ] | |
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