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PDF MP174 Data sheet ( Hoja de datos )
| Número de pieza | MP174 | |
| Descripción | 700V Non-Isolated Off-Line Regulator | |
| Fabricantes | MPS | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de MP174 (archivo pdf) en la parte inferior de esta página. Total 22 Páginas | ||
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The Future of Analog IC Technology
MP174
700V Non-Isolated Off-Line Regulator,
Up to 400mA Output Current
DESCRIPTION
MP174 is a primary-side regulator that provides
accurate constant voltage (CV) regulation
without opto-coupler. It supports Buck, Buck-
Boost, Boost and Flyback topologies. It has an
integrated 700V MOSFET to simplify the
structure and reduce costs. These features
make it an ideal regulator for off-line low power
applications, such as home appliances and
standby power.
MP174 is a green-mode-operation regulator.
Both the peak current and switching frequency
decrease as the load decreases. This feature
provides excellent efficiency at light load, and
improves the overall average efficiency.
MP174 features various protections, including
thermal shutdown (OTP), VCC under-voltage
lockout (UVLO), overload protection (OLP),
short-circuit protection (SCP), and open loop
protection.
MP174 is available in small TSOT23-5 package
and SOIC8 package.
FEATURES
• Primary-side CV control, supporting Buck,
Buck-Boost, Boost and Flyback topologies
• Integrated 700V/13.5Ω MOSFET and
current source
• <30mW no-load power consumption
• Up to 5W output power
• Maximum DCM output current less than
250mA
• Maximum CCM output current less than
400mA
• Low VCC Operating Current
• Frequency foldback
• Limited maximum frequency
• Peak-current compression
• Internally biased VCC
• OTP, UVLO, OLP, SCP, open loop
protection
APPLICATIONS
• Home appliances, white goods and
consumer electronics
• Industrial controls
• Standby power
All MPS parts are lead-free and adhere to the RoHS directive. For MPS green
status, please visit MPS website under Quality Assurance. “MPS” and “The
Future of Analog IC Technology” are Registered Trademarks of Monolithic Power
Systems, Inc.
TYPICAL APPLICATION
MP174 Rev. 1.0
10/22/2014
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2014 MPS. All Rights Reserved.
1
1 page  
TYPICAL CHARACTERISTICS
MP174 – NON-ISOLATED OFF-LINE REGULATOR
MP174 Rev. 1.0
10/22/2014
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2014 MPS. All Rights Reserved.
5
5 Page 
MP174 – NON-ISOLATED OFF-LINE REGULATOR
OPERATION
MP174 is a green-mode-operation regulator: the
peak current and the switching frequency both
decrease with a decreasing load. As a result, it
offers excellent light-load efficiency, and
improves average efficiency. The typical
application diagram shows the regulator operates
with a minimum number of external components.
It incorporates multiple features as described in
the following sections.
Start-Up and Under-Voltage Lockout
The internal high-voltage regulator self-supplies
the IC from the Drain pin. When VCC voltage
reaches 5.6V, the IC starts switching and the
internal high voltage regulator turns off. The
internal high-voltage regulator turns on to charge
the external VCC capacitor when the VCC
voltage falls below 5.3V. A small capacitor (in the
low μF range) can maintain the VCC voltage and
thus lower the capacitor cost.
The IC stops switching when the VCC voltage
drops blow 3.4V.
Under fault conditions—such as OLP, SCP, and
OTP—the IC stops switching and an internal
current source (~16μA) discharges the VCC
capacitor. The internal high-voltage regulator will
not charge the VCC capacitor until the VCC
voltage drops below 2.4V. The restart time can
be estimated using the following equation,
τrestart
= CVCC
×
VCC − 2.4V
16μA
+
CVCC
×
5.6V − 2.4
4.1mA
V
Soft-Start
The IC stops operation when VCC voltage drops
blow 3.4V and starts operation when VCC
charges to 5.6V. Every time when the chip starts
operation there is a Soft-Start period. The soft-
start prevents the inductor current from
overshooting by limiting the minimum off time.
MP174 adopts a 2 phase minimum off-time limit
soft-start. Each Soft-Start phase retains 128
switching cycles. During soft-start, off time limit
gradually shortens from 48μs to 24μs, and finally
to the 12μs normal operation off-time limit (see
Figure 2Error! Reference source not found.).
Driver
48us
24 us
12 us
128 Switching cycle
128 Switching cycle
Figure 2: τminoff at Start-Up
Constant Voltage Operation
MP174 acts as a fully-integrated regulator when
used in the Buck topology, as shown in the
typical application on page1.
It regulates the output voltage by monitoring the
sampling capacitor.
At the beginning of each cycle, the integrated
MOSFET turns on while the feedback voltage
drops below the 2.55V reference voltage, which
indicates insufficient output voltage. The peak
current limitation determines the ON period. After
the ON period elapses, the integrated MOSFET
turns off. Sampling capacitor (C3) voltage is
charged to the output voltage, when the
freewheeling diode (D1) turns on. In this way, the
sampling capacitor (C3) samples and holds the
output voltage for output regulation. The
sampling capacitor (C3) voltage decreases when
the L1 inductor current falls below the output
current. When the feedback voltage falls below
the 2.55V reference voltage, a new switching
cycle begins. Figure 3 shows this operation
under CCM in detail.
MOSFET
Diode
IL
Ipe ak
Io
Vo
V FB
2.55 V
Figure 3: VFB vs. VO
Use the following equation to determine the
output voltage:
Vo
=
2.55V
×
R1+ R2
R2
MP174 Rev. 1.0
10/22/2014
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2014 MPS. All Rights Reserved.
11
11 Page | ||
| Páginas | Total 22 Páginas | |
| PDF Descargar | [ Datasheet MP174.PDF ] | |
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