MP155
Energy Efficient Off-line Regulator
The Future of Analog IC Technology
DESCRIPTION
FEATURES
The MP155 is a primary-side regulator that
provides accurate constant voltage regulation
without the opto-coupler, and supports Buck,
Buck-boost, Boost and Flyback topologies. An
integrated 500V MOSFET simplifies the
structure and reduces costs. These features
make it a competitive candidate for off-line lowpower applications, such as home appliances
and standby power.
The MP155 is a green-mode-operation
regulator. Both the peak current and the
switching frequency decrease as the load
decreases. As a result, it offers excellent
efficiency performance at light load, thus
improving the overall average efficiency.
The MP155 features various protections such
as thermal shutdown (TSD), VCC under-voltage
lockout (UVLO), overload protection (OLP),
short-circuit protection (SCP), and open loop
protection.
The MP155 is available in the TSOT23-5 and
SOIC8 packages.
Primary-side constant voltage (CV) control,
supporting Buck, Buck-boost, Boost and
Flyback topologies
Integrated 500V/20Ω MOSFET
< 100mW No-load power consumption
Up to 4W output power
Maximum DCM output current of 130mA
Maximum CCM output current of 220mA
Low VCC operating current
Frequency foldback
Maximum frequency limit
Peak current compression
Internal high-voltage current source
Internal 350ns leading-edge blanking
Thermal shutdown (auto restart)
VCC under-voltage lockout with hysteresis
(UVLO)
Timer-based overload protection.
Short circuit protection
Open loop protection
APPLICATIONS
Home Appliances, white goods and
consumer electronics
Industrial Controls
Standby Power
All MPS parts are lead-free, halogen 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
MP155 Rev. 1.16
9/25/2018
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1
MP155 – ENERGY EFFICIENT OFF-LINE REGULATOR
ORDERING INFORMATION
Part Number*
Package
Top Marking
MP155GJ
MP155GS
TSOT23-5
SOIC8
AEN
MP155
* For Tape & Reel, add suffix –Z (e.g. MP155GJ–Z);
* For Tape & Reel, add suffix –Z (e.g. MP155GS–Z);
PACKAGE REFERENCE
TOP VIEW
VCC
1
FB
2
SOURCE
TOP VIEW
5
3
4
DRAIN
SOURCE
TSOT23-5
VCC
1
8
N/C
FB
2
7
DRAIN
SOURCE
3
6
N/C
SOURCE
4
5
N/C
SOIC8
ABSOLUTE MAXIMUM RATINGS (1)
Thermal Resistance (4)
Drain to SOURCE ......................... -0.7V to 500V
All the other Pin .............................. -0.7V to 6.5V
Continuous Power Dissipation (TA = +25°C) (2)
TSOT23-5 ...................................................... 1W
SOIC8............................................................. 1W
Junction Temperature ............................... 150°C
Lead Temperature .................................... 260°C
Storage Temperature ................-60°C to +150°C
ESD Capability Human Body Mode .......... 4.0kV
ESD Capability Machine Mode ................... 200V
TSOT23-5 .............................. 100 ...... 55 ... °C/W
SOIC8...................................... 96 ....... 45 ... °C/W
Recommended Operating Conditions (3)
Operating Junction Temp. (TJ). -40°C to +125°C
Operating VCC range ..................... 5.3V to 5.6V
MP155 Rev. 1.16
9/25/2018
θJA
θJC
Notes:
1) Exceeding these ratings may damage the device.
2) The maximum allowable power dissipation is a function of the
maximum junction temperature TJ(MAX), the junction-toambient thermal resistance θJA, and the ambient temperature
TA. The maximum allowance continuous power dissipation at
any
ambient
temperature
is
calculated
by
PD(MAX)=(TJ(MAX)-TA)/θJA. Exceeding the maximum
allowance power dissipation will cause excessive die
temperature, and the regulator will go into thermal shutdown.
Internal thermal shutdown circuit protects the device from
permanent damage.
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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2
MP155 – ENERGY EFFICIENT OFF-LINE REGULATOR
ELECTRICAL CHARACTERISTICS
VCC = 5.8V, TA = 25°C, unless otherwise noted.
Parameter
Symbol
Start-up Current Source (Drain Pin)
Internal regulator supply current
Iregulator
Drain pin leakage current
ILeak
Breakdown Voltage
V(BR)DSS
Supply Voltage Management (VCC Pin)
VCC regulator turn-off level (rising)
VCCOFF
VCC regulator turn-on level (falling)
VCCON
On and off VCC regulator hysteresis
VCC turn-off level (falling)
VCCstop
VCC phase completion level (falling)
VCCpro
Internal IC consumption
Internal IC consumption (no
switching)
Internal IC Consumption, latch-off
phase
Internal MOSFET (Drain Pin)
Breakdown voltage
ON-State resistance
ICC
Condition
Min
Typ
Max
Units
VCC=4V;VDrain=100V
VCC=5.8V;VDrain=400V
2.5
3.5
10
4.5
12
mA
μA
V
5.6
5.3
250
3.4
2.4
5.8
5.6
V
V
mV
V
V
430
μA
250
μA
500
5.4
5.1
VCC=5.8V, fs=37kHz,
D=40%
ICC
ICCLATCH
VCC=5.3V
VBRDSS
16
μA
500
Ron
V
20
Ω
Internal Current Sense
Peak current limit
ILimit
260
290
345
mA
Leading-edge blanking
τLEB1
350
ns
SCP point
ISCP
450
mA
Leading-edge blanking for SCP
τLEB2
180
ns
Feedback input (FB Pin)
Minimum OFF time
Primary MOSFET feedback turn-on
threshold
OLP feedback trigger threshold
τminoff
15
18
21
μs
VFB
2.45
2.55
2.65
V
VFB_OLP
1.6
1.7
1.8
V
Over-load protection delay
τOLP
Open loop detection
Thermal Shutdown
VOLD
Thermal shutdown threshold
MP155 Rev. 1.16
9/25/2018
fs=37kHz
170
ms
60
mV
150
°C
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MP155 – ENERGY EFFICIENT OFF-LINE REGULATOR
TYPICAL CHARACTERISTICS
Breakdown Voltage vs.
Junction Temperature
640
620
2
On-State Resistance vs.
Junction Temperature
Feedback Voltage vs.
Junction Temperature
2.8
2.7
1.6
2.6
1.2
580
560
VFB(V)
VBRDSS(V)
600
0.8
540
2.4
2.3
2.2
0.4
520
2.5
2.1
500
-40 -20
0
25
85 105 125
0
-40 -20
0
25
85 105 125
2
-40 -20
0
25
85 105 125
Minimum Off Time vs.
Junction Temperature
20
19
18
17
16
15
14
13
12
11
10
-40 -20
MP155 Rev. 1.16
9/25/2018
0
25
85 105 125
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MP155 – ENERGY EFFICIENT OFF-LINE REGULATOR
TYPICAL PERFORMANCE CHARACTERISTICS
VIN = 265VAC, VOUT = 12V, IOUT = 200mA, L = 2.2mH, COUT = 100μF, TA = +25°C, unless otherwise
noted.
Start up
Normal operation
SCP
Zoom In
Zoom In
Zoom In
VDS
100V/div.
VDS
100V/div.
VDS
100V/div.
IL
100mA/div.
IL
100mA/div.
IL
100mA/div.
Open Loop Protection
Zoom In
VDS
100V/div.
IL
250mA/div.
MP155 Rev. 1.16
9/25/2018
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MP155 – ENERGY EFFICIENT OFF-LINE REGULATOR
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
VIN = 230VAC, VOUT = 12V, IOUT = 200mA, L = 2.2mH, COUT = 100μF, TA = +25°C, unless otherwise
noted.
Input Power Start Up
Input Power Shut Down
VDS
100V/div.
VDS
100V/div.
IL
200mA/div.
IL
200mA/div.
SCP recovery
SCP Entry
VDS
100V/div.
IL
200mA/div.
Open Loop Entry
Open Loop Recovery
VDS
100V/div.
VDS
100V/div.
VDS
100V/div.
IL
200mA/div.
IL
200mA/div.
IL
200mA/div.
Output Voltage Ripple
VRIPPLE
50mV/div.
Load Transient
VRIPPLE
50mV/div.
IOUT
200mA/div.
MP155 Rev. 1.16
9/25/2018
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MP155 – ENERGY EFFICIENT OFF-LINE REGULATOR
PIN FUNCTIONS
Pin #
Pin #
Name
TSOT23-5 SOIC8
1
1
VCC
2
2
FB
3,4
3,4 SOURCE
5
7
DRAIN
5,6,8
N/C
MP155 Rev. 1.16
9/25/2018
Description
Control Circuit Power Supply.
Regulator Feedback.
Internal Power MOSFET Source. Ground reference for VCC and FB pins.
Internal Power MOSFET Drain. High-voltage current source input.
Not connected.
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MP155 – ENERGY EFFICIENT OFF-LINE REGULATOR
FUNCTIONAL BLOCK DIAGRAM
Vcc
Start up unit
Power
Management
Drain
Driving Signal
Management
Feedback control
Peak current
Limitation
FB
Protection Unit
Source
Figure 1: Functional Block Diagram
MP155 Rev. 1.16
9/25/2018
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MP155 – ENERGY EFFICIENT OFF-LINE REGULATOR
OPERATION
The MP155 is a green-mode-operation regulator.
The peak current and the switching frequency
both decrease as the load decreases to provide
excellent efficiency at light load, and thus
improve the overall average efficiency. The
typical application diagram shows that the
regulator operates using a minimal number of
external components. It incorporates the
following features:
Start-up and Under Voltage Lock-out
The internal high-voltage regulator supplies IC
from the Drain pin. The IC starts switching and
the internal high voltage regulator turns off when
the voltage on VCC reaches 5.6V. When the
VCC voltage drops below 5.3V, the internal high
voltage regulator turns on again to charge the
external VCC capacitor. Use a capacitor in the
several µF range stabilize the VCC voltage and
this can lower the cost by decreasing the value of
the capacitor.
When the voltage on VCC drops blow 3.4V, the
IC stops, then the internal high-voltage regulator
charges the VCC capacitor.
When faults occur, such as overload, short circuit,
and over-heating, the IC stops working and an
internal current source (16µA) discharges the VCC
capacitor. Before the VCC voltage drops below
2.4V, the internal high-voltage regulator remains off
and the VCC capacitor remains discharged.
Estimate the restart time after a fault as:
Constant Voltage Operation
The MP155 is a fully-integrated regulator when
used in a Buck solution as shown in the typical
application on page 1.
The integrated MOSFET turns ON at the
beginning of each cycle when the feedback
voltage is below the reference voltage (2.5V),
which indicates insufficient output voltage. The
peak current limit determines the ON period.
After the ON period elapses, the integrated
MOSFET turns OFF. The freewheeling diode (D1)
remains OFF until the inductor current charges
the sampling capacitor (C3) voltage to the output
voltage level. Then the sampling capacitor
voltage changes with the output voltage. The
sampling capacitor can sample and hold the
output voltage to regulate the output voltage. The
sampling capacitor voltage decreases after the
inductor current drops below the output current.
When the feedback voltage falls below the
reference voltage (2.5V), a new switching cycle
begins.
Figure 3 shows the detailed operation timing
diagram under CCM.
MOS
Diode
IL
restart CVCC
VCC 2.4V
5.6V 2.4V
CVCC
16uA
3.5mA
Figure 2 shows the typical waveform with VCC
under voltage lock out.
I peak
Io
Vo
VFB
2.5V
Figure 3: VFB vs. Vout
Monitoring the sampling capacitor regulates the
output voltage can be regulated, as per the
following equation:
Vo 2.5V
R1 R2
R2
Figure 2: VCC Under-Voltage Lockout
MP155 Rev. 1.16
9/25/2018
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MP155 – ENERGY EFFICIENT OFF-LINE REGULATOR
EA Compensation
FB
Comparator
+
EA
VFB
+
+
M
Frequency Foldback
Under light load or no load conditions, the output
drops very slowly, which increases the time for
the MOSFET to turn ON again; i.e., frequency
decreases as the load decreases. So the MP155
can maintain a high efficiency under light load
condition by reducing the switching frequency
automatically.
Vramp
+
Vramp
The switching frequency can be obtained as:
(Vin Vo ) Vo
, for CCM
fs
2L(Ipeak Io ) Vin
2(Vin VO ) Io Vo
, for DCM
fs
LI2peak
Vin
At the same time, the peak current limit
decreases from 290mA as the OFF time
increases. In standby mode, the frequency and
the peak current are both minimized, allowing for
a small dummy load. As a result, the peakcurrent-compression function helps to reduce noload consumption. Determine the peak current
limitation from the following equation where τoff is
the power module OFF time:
IPeak 290mA (1mA / S) ( off 18S)
Minimum off time limitation
The MP155 implements a minimum OFF time
limit. During the normal operation, the minimum
OFF time limit is 18µs; during start up, the
minimum OFF time limit gradually drops from
72µs, to 36µs, then to 18 µs (see Figure 4). Each
minimum OFF time has 128 switching cycles.
This soft-start function allows for safe start-up.
Driver
72us
36us
18us
128 Switching cycle 128 Switching cycle
Figure 4: τminoff at Start-Up
MP155 Rev. 1.16
9/25/2018
+
-
Vref
2.5V
Ipeak
Figure 5: EA and Ramp Compensation
To improve load regulation, the MP150
implements an error amplifier (EA) compensation
function ( Figure 5 ). The MP155 samples the
feedback voltage 6µs after the MOSFET turns off.
EA compensation regulates the 2.5V reference
voltage with the load, thus improving the power
module regulation.
RAMP Compensation
An internal ramp compensation circuit precisely
maintains the output voltage. An additional
exponential voltage sinking source pulls down
the feedback comparator’s reference voltage as
shown in Figure 5. The ramp compensation is
relative to the load conditions: Under full-load
conditions, the compensation is ~1mV/µs; with a
decreasing load, the compensation increases
exponentially.
Over Load Protection (OLP)
As the load increases, the peak current and the
switching frequency increase with the load. When
the switching frequency and peak current
reaches their maximums, the output voltage will
decrease if the load continues to increase. Then
the FB voltage will drop below OLP threshold.
By continuously monitoring the FB voltage, the
timer starts when the FB voltage drops below the
1.7V error flag threshold. Removing the error flag
resets the timer. If the timer continues to
completion at 170ms (fs =37kHz), OLP occurs.
This timer duration avoids triggering OLP when
the power supply starts up or enters a load
transition phase, and therefore requires that the
power supply start up in less than 170ms. A
different switching frequency (fs) changes the
over-load protection delay time, as shown below:
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MP155 – ENERGY EFFICIENT OFF-LINE REGULATOR
Dealy 170ms
37kHz
fs
Short Circuit Protection (SCP)
The MP155 shuts down when the peak current
rises above 450mA as its short-circuit protection
threshold. The power supply resumes operation
after removing the fault.
Thermal shutdown (TSD)
To prevent from any lethal thermal damage, the
MP150 shuts down switching when the inner
temperature exceeds 150°C. During thermal
shutdown (TSD), the VCC drops to 2.4V, and
then the internal high voltage regulator recharges
VCC.
Open Loop Detection
If the VFB drops below 60mV, the IC will stop
working and begins a re-start cycle. The openloop detection is blanked for 128 switching cycles
during start-up.
Leading-Edge Blanking
An internal leading-edge blanking (LEB) unit
between the current sense resistor inside the IC
and the current comparator input avoids
prematurely switching pulse termination due to
the parasitic capacitance. During the blanking
period, the current comparator is disabled and
cannot turn off the external MOSFET. Figure 6
shows leading-edge blanking.
VLimit
TLEB =350nS
t
Figure 6: Leading-Edge Blanking
MP155 Rev. 1.16
9/25/2018
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MP155 – ENERGY EFFICIENT OFF-LINE REGULATOR
APPLICATION INFORMATION
Table 1. Common Topologies Using MP155
Topology
Circuit Schematic
Features
High-Side
Buck
1.
2.
3.
4.
No-isolation,
Positive output
Low cost
Direct feedback
High-Side
BuckBoost
1. No-isolation,
2. Negative output
3. Low cost
4. Direct feedback
Boost
1.
2.
3.
4.
No-isolation,
Positive output
Low cost
Direct feedback
Flyback
1.
2.
3.
4.
Isolation,
Positive output
Low cost
Indirect feedback
MP155 Rev. 1.16
9/25/2018
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MP155 – ENERGY EFFICIENT OFF-LINE REGULATOR
MP155 can be used in common topologies, such
as Buck, Buck-Boost, Boost and Flyback. Please
find the Table.1 for more information.
Component Selection
Input Capacitor
The input capacitor supplies the converter’s DC
input voltage. Figure 7 shows the typical halfwave rectifier’s DC bus voltage waveform.
Vin
V DC(max)
MAXIMUM OUTPUT POWER(W)
1.2
Topology Options
1.1
1
0.9
PMIN
0.8
0.7
0.6
0.6
1.1
DC input voltage
1.6
2.1
2.6
INDUCTOR(mH)
VDC(min)
AC input voltage
t
Figure 7: Input Voltage Waveform
When using the half-wave rectifier, set the input
capacitor 3µF/W for the universal input condition.
When using the full-wave rectifier, choose a
smaller capacitor, but avoid a minimum DC
voltage below 70V to avoid thermal shutdown.
MAXIMUM OUTPUT POWER(W)
Figure 8: Pmin vs. L for 5V
3
2.5
2
1.5
1
PMIN
0.5
0
0.6
1.1
Inductor
MP155 has a minimum off time limit that
determines the maximum power output. The
maximum power increases with the inductor
value. Using a smaller inductor may cause the
output to fail at full load, but a larger inductor
results in a higher OLP load. The optimal
inductor value is the smallest that can supply the
rated power. The maximum power is:
Po max Vo (Ipeak
Po max
Vo min off
) , for CCM
2L
1 2
1 , for DCM
LIpeak
2
min off
To account for converter parameters—such as
peak current limit and minimum OFF time—
estimate the minimum inductor power (Pmin) for
the maximum power, and selecting an inductor
with a Pmin value that exceeds the rated power.
1.6
2.1
2.6
INDUCTOR(mH)
Figure 9: Pmin vs. L for 12V
When designing a 0.5W converter (5V, 0.1A),
estimate the minimum inductor value at 0.6mH
based on Figure 8. Similarly, for a 1.2W
converter (12V, 0.1A), estimate the minimum
inductor at 0.9mH based on Figure 9 .
Use a standard off-the-shelf inductor to reduce
costs. Use a standard inductance that exceeds
calculated inductance.
Freewheeling Diode
Choose a diode with a maximum reverse voltage
rating that exceeds the maximum input voltage,
and a current rating that exceeds the output
current.
The reverse recovery of the freewheeling diode
can affect the efficiency and circuit operation.
Select an ultra-fast diode, such as the EGC10JH.
Using output voltages 5V and 12V as examples,
Figure 8 shows the curve for Pmin at 5V, and
Figure 9 shows the curve for Pmin at 12V.
(Ipeak=0.29A, τminoff=18µs)
MP155 Rev. 1.16
9/25/2018
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MP155 – ENERGY EFFICIENT OFF-LINE REGULATOR
Output Capacitor
The output capacitor maintains the DC output
voltage. Estimate the output voltage ripple as:
VCCM _ ripple
VDCM _ ripple
i
i RESR , for CCM
8fsCo
I
o
fsCo
2
I I
pk o Ipk RESR , for DCM
I
pk
Use ceramic, tantalum, or low-ESR electrolytic
capacitors to lower the output voltage ripple.
Feedback Resistors
The resistor divider determines the output
voltage. Choose appropriate R1 and R2 values to
maintain the FB voltage at 2.5V. Avoid very large
values for R2 (typical values between 5kΩ
to10kΩ.
Table 2: Recommended VCC Supply Resistor
Values
VOUT
Resistor value
3.3V
NC (5)
5V
12V
16V
24V
NC
24.8k
40.8k
72.8k
Notes:
5) NC= no connection.
Surge Performance
To obtain a good surge performance, select an
appropriate input capacitor that meets different
surge tests. Figure 10 shows the half-wave
rectifier. Table 3 shows the required capacitance
under normal conditions for different surge
voltages.
L1
UL
+
Feedback Capacitor
The feedback capacitor provides a sample-andhold function. Small capacitors result in poor
regulation at light load condition, and large
capacitors can impact circuit operation. Estimate
the capacitor range as per the following equation:
C1
UN
C
Vo
C
1 Vo
o CFB
o
2 R1 R 2 Io
R1 R 2 Io
Choose an appropriate value given practical
considerations.
Dummy Load
A dummy load maintains the load regulation. This
ensures sufficient inductor energy to charge the
sample-and-hold capacitor to detect the output
voltage. Start with a 3mA dummy load and adjust
as necessary.
C2
-
Figure 10: Half-Wave Rectifier
Table 3: Recommended Capacitor Values
Surge
voltage
C1
C2
500V
1000V
2000V
1μF
1μF
10μF
4.7μF
22μF
10μF
VCC Supply
The MP155 obtains a low no-load power
consumption by external VCC supply. This
supply is dependent on the value of Vout. Connect
a diode and resistor between C2 and C3 as per
the values listed in Table 2.
MP155 Rev. 1.16
9/25/2018
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MP155 – ENERGY EFFICIENT OFF-LINE REGULATOR
Layout Guide
PCB layout is very important to achieve reliable
operation, and good EMI and thermal
performance. Follow these guidelines to optimize
performance.
1) Minimize the loop area formed by the input
capacitor, IC part, freewheeling diode,
inductor and output capacitor.
2) Place the power inductor far away from the
input filter.
3) Add a capacitor in the several-hundred pF
range between pin FB and source as close to
the IC as possible.
4) Connect the exposed pad with the Drain pin
to a large copper area to improve thermal
performance.
Bottom Layer
Design Example
Below is a design example following the
application guidelines given the following
specifications:
Table 4: Design Example
85 to 265Vac
VIN
12V
VOUT
200mA
IOUT
Figure 11 shows the detailed application
schematic.
The
Typical
Performance
Characteristics section lists typical performance
and circuit waveforms. For more device
application, please refer to the related Evaluation
Board Datasheets.
Top
MP155 Rev. 1.16
9/25/2018
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MP155 – ENERGY EFFICIENT OFF-LINE REGULATOR
TYPICAL APPLICATION CIRCUITS
Figure 11 shows a typical application example of a 12V, 200mA non-isolated power supply using the
MP155.
Figure 11: Typical Application, 12V/200mA
MP155 Rev. 1.16
9/25/2018
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MP155 – ENERGY EFFICIENT OFF-LINE REGULATOR
FLOW CHART
Start
Vcc Decrease
to 2.4
Internal High Voltage
Regulator ON
Shut Down
Internal High Voltage
Regulator
Y
Vcc>5.6V
N
Shut off the
Switching
Pulse
Y
Vcc
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