MPS MP161A-33 Power solution with ultra-low standby power, integrated switching regulator, linear regulator, and relay driver Datasheet

MP161
Power Solution with Ultra-Low Standby
Power, Integrated Switching Regulator,
Linear Regulator, and Relay Driver
DESCRIPTION
FEATURES
The MP161 integrates a 700V switching
regulator, a low-dropout linear regulator, and
two channel relay drivers. The MP161 also has
a special standby mode to minimize standby
power. The MP161 is designed for home
automation, industrial automation, and any
other applications that adopt relays and MCUs.
700V Switching Regulator
 Integrated 700V MOSFET and Current
Source
 Constant Voltage (CV) Regulation with
Internal Loop Compensation
 Optimized Light-Load Efficiency by
Frequency Modulation
 Standby Mode
 Anti-Audible Noise Operation by Peak
Current Modulation
 Adjustable or Fixed 12V Output
 Low Operating Current
 Over-Temperature Protection (OTP), ShortCircuit Protection (SCP), Overload
Protection (OLP), and Over-Voltage
Protection (OVP)
The 700V switching regulator adopts constant
voltage (CV) regulation with internal loop
compensation. Light-load efficiency is optimized
by proper modulation of the switching frequency
and peak current. Various protections are also
included to guarantee reliable operation.
The integrated low-dropout linear regulator is
able to operate with an input up to 30V. The
output voltage is fixed at either 5V or 3.3V. The
MP161 also has over-temperature protection
(OTP).
Built-in relay drivers are intended to drive up to
two relays using the switching regulator output.
Freewheeling diodes are integrated to cut down
external components.
Low-Dropout Linear Regulator
 Up to 30V Input Voltage
 Fixed Output, with 3.3V and 5V Options
 Over-Temperature Protection (OTP)
When standby mode enabled, the switching
regulator output voltage is lowered to reduce
power consumption.
Relay Driver
 2Ω On State Resistance
 Rail Voltage up to 30V
 Integrated Freewheeling Diode
 Nominal Off Driver
The MP161 is available in a SOIC-16 package.
APPLICATIONS
Part
Number
MP161A-33*
MP161A-5
MP161B-33*
MP161B-5*
MP161C-33*
MP161C-5*
Typical
Switching
Regulator
Peak
Current
Limit
Typical
HV
MOSFET
RDS(ON)
240mA
17Ω
420mA
14Ω
660mA
13.5Ω
LDO
Output
Voltage


Home/Industrial Automation
Small Appliances
All MPS parts are lead-free, halogen-free, and adhere to the RoHS directive. For
MPS green status, please visit the MPS website under Quality Assurance. “MPS”
and “The Future of Analog IC Technology” are registered trademarks of
Monolithic Power Systems, Inc.
3.3V
5V
3.3V
5V
3.3V
5V
* Parts are under development. All following descriptions and data
related to these parts are subject to change.
MP161 Rev. 1.0
8/4/2017
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1
MP161 – INTEGRATED POWER SOLUTION FOR HOME/INDUSTRIAL AUTOMATION
TYPICAL APPLICATION
+
VIN
VOUT1
Drain
Source
VCC
700V Switching
Regulator
FB
VIN
STBY
LDO
VO
VOUT2
GND
INA
INB
MP161 Rev. 1.0
8/4/2017
Relay Driver
OUTA
OUTB
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2
MP161 – INTEGRATED POWER SOLUTION FOR HOME/INDUSTRIAL AUTOMATION
ORDERING INFORMATION
Part Number*
MP161AGS-5
Package
SOIC-16
Top Marking
See Below
* For Tape & Reel, add suffix –Z (e.g. MP161AGS-5–Z)
TOP MARKING
MPS: MPS prefix
YY: Year code
WW: Week code
MP161A-5: Part number
LLLLLLLLL: Lot number
PACKAGE REFERENCE
TOP VIEW
OUTB
INB
INA
STBY
GND
VO
NC
NC
DRAIN
OUTA
GND
VIN
NC
SOURCE
FB
VCC
SOIC-16
MP161 Rev. 1.0
8/4/2017
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3
MP161 – INTEGRATED POWER SOLUTION FOR HOME/INDUSTRIAL AUTOMATION
ABSOLUTE MAXIMUM RATINGS (1)
Thermal Resistance (4)
DRAIN to SOURCE ..................... -0.3V to 700V
VCC to SOURCE ........................... -0.3V to 30V
FB to SOURCE ................................ -0.3V to 7V
SOURCE to GND ......................... -15V to 700V
STBY, INA, INB, VO to GND............ -0.3V to 7V
VIN, OUTA, OUTB to GND ............ -0.3V to 30V
Continuous power dissipation (TA = +25°C) (2)
................................................................ 1.56W
Junction temperature ............................... 150°C
Lead temperature .................................... 260°C
Storage temperature ................ -60°C to +150°C
ESD charged device model ...................... 2.0kV
SOIC-16 ................................ 80 ....... 30 ... °C/W
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
produces an excessive die temperature, causing the regulator
to 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.
Recommended Operating Conditions (3)
Junction temperature (TJ) ........ -40°C to +125°C
MP161 Rev. 1.0
8/4/2017
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4
MP161 – INTEGRATED POWER SOLUTION FOR HOME/INDUSTRIAL AUTOMATION
ELECTRICAL CHARACTERISTICS
VCC = 12V, VIN = 12V, TJ = -40°C ~ 125°C, min and max values are guaranteed by
characterization, typical values are tested under TJ = 25°C, unless otherwise specified. (5)
Parameter
Symbol
Condition
Min
Typ
Max
Units
2.2
4.1
6
mA
10
17
μA
V
17
20.5
24
28
High-Voltage (HV) Current Source and Internal MOSFET (DRAIN)
Internal HV current source supply
current for VCC regulation
DRAIN leakage current
Breakdown voltage
On resistance
Iregulator
ILeak
V(BR)DSS
Ron
Maximum on time
tmaxon
Minimum off time
tminoff
OLP delay cycles
Supply Voltage Management (VCC)
Internal HV current source turn off
threshold
Internal HV current source turn on
threshold
UVLO upper threshold
UVLO lower threshold
Hysteresis of HV current source
turn on threshold and UVLO lower
threshold
Threshold to reset protections
Regulating voltage (threshold to
turn on MOSFET)
Regulating reference in standby
mode
IC consumption
IC consumption, latch-off phase
Feedback (FB)
Reference voltage (threshold to
turn on MOSFET)
Internal lower resistor
Internal upper resistor
MP161 Rev. 1.0
8/4/2017
VCC = 4V, VDRAIN = 100V
VDRAIN = 400V
TJ = 25°C
MP161AGS-33, MP161AGS-5,
TJ = 25°C
MP161AGS-33, MP161AGS-5,
TJ = 125°C
MP161BGS-33, MP161BGS-5,
TJ = 25°C
MP161CGS-33, MP161CGS-5,
TJ = 25°C
MP161AGS-33, MP161AGS-5,
MP161BGS-33, MP161BGS-5,
MP161CGS-33, MP161CGS-5
MP161AGS-33, MP161AGS-5,
MP161BGS-33, MP161BGS-5,
MP161CGS-33, MP161CGS-5
toff = tminoff
700
Ω
14
13.5
21
25
30
7
9.5
12
μs
μs
12
8192
VHVoff
4.4
4.65
4.9
V
VHVon
3.85
4.1
4.3
V
VCCH
VCCL
3.4
VHVoff
3.6
3.75
V
V
VHVon - VCCL
350
VCCpro
VCCref
FB open
VCCSTBY
ICC
fs = 50kHz
ICCL
VCC = 5V
mV
2.4
2.7
V
11.9
12.5
13
V
5.4
5.7
6
V
600
μA
28
μA
20
Vref
1.175 1.225 1.275
V
Rlow
Rup
450
4.1
kΩ
MΩ
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5
MP161 – INTEGRATED POWER SOLUTION FOR HOME/INDUSTRIAL AUTOMATION
ELECTRICAL CHARACTERISTICS (continued)
VCC = 12V, VIN = 12V, TJ = -40°C ~ 125°C, min and max values are guaranteed by
characterization, typical values are tested under TJ = 25°C, unless otherwise specified. (5)
Parameter
Internal Current Sense (SOURCE)
Peak current limit
Leading-edge blanking
Symbol
ILimit
Condition
MP161AGS-33, MP161AGS-5,
TJ = 25°C
MP161BGS-33, MP161BGS-5,
TJ = 25°C
MP161CGS-33, MP161CGS-5,
TJ = 25°C
ISCP
Leading-edge blanking for SCP (6)
Typ
Max
218
240
262
420
Units
mA
660
tLEB1
350
MP161AGS-33, MP161AGS-5,
TJ = 25°C
SCP threshold
Min
455
525
MP161BGS-33, MP161BGS-5,
TJ = 25°C
630
MP161CGS-33, MP161CGS-5,
TJ = 25°C
990
tLEB2
ns
590
mA
180
ns
Control Inputs (STBY, INA, INB)
Low-level input voltage
High-level input voltage
Input hysteresis
STBY input hysteresis
Internal pull-down resistor
Relay Drivers (OUTA, OUTB)
VIL-u
VIH-u
2.0
0.23
VHYS_INX
VHYS_STBY
Rpull-down
Breakdown voltage
MOSFET on state resistance
Off state leakage current
Turn-on delay
V(BR)RD
Ron
ILK(off)
td(on)
Turn-off delay
Voltage drop on freewheeling
diode
td(off)
MP161 Rev. 1.0
8/4/2017
0.8
VF
0.18
V
kΩ
450
30
IOUTA/B = 50mA
VSOURCE = 400V
IF = 100mA, OUTA/B to VIN
V
V
V
50
V
Ω
μA
ns
100
ns
1
V
2
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1
6
MP161 – INTEGRATED POWER SOLUTION FOR HOME/INDUSTRIAL AUTOMATION
ELECTRICAL CHARACTERISTICS (continued)
VCC = 12V, VIN = 12V, TJ = -40°C ~ 125°C, min and max values are guaranteed by
characterization, typical values are tested under TJ = 25°C, unless otherwise specified. (5)
Parameter
Linear Regulator (VIN, VO)
Symbol
Input over-voltage protection
VOVP
OVP discharge current
VIN UVLO upper threshold
VIN UVLO lower threshold
IOVP
VINH
VINL
Output voltage
VO
Quiescent current
IQIN
Line regulation (7)
Load regulation (8)
Dropout voltage
VDrop
Condition
Min
Typ
Max
Units
26.5
28
29
V
3.9
3.5
5
4.2
3.75
4.5
4
mA
V
V
4.9
5
5.1
VIN = 30V
MP161AGS-5, MP161BGS-5,
MP161CGS-5
MP161AGS-33, MP161BGS-33,
MP161CGS-33
MP161AGS-5, MP161BGS-5,
MP161CGS-5,
VIN = 5.5V
MP161AGS-5, MP161BGS-5,
MP161CGS-5, IOUT = 1mA,
VIN = 5.4V-24V
MP161AGS-5, MP161BGS-5,
MP161CGS-5, IOUT = 1mA to
100mA
MP161AGS-5, MP161BGS-5,
MP161CGS-5, IOUT = 50mA,
VIN to VO, VIN = 4.9V
V
3.3
240
μA
0.005
0.01
%/V
0.005
0.01
%/mA
300
mV
Over-Temperature Protection
Thermal shutdown threshold (6)
Thermal shutdown recovery
hysteresis (6)
150
°C
30
°C
NOTES:
5) The values on DRAIN, VCC, and FB are all referenced to SOURCE. The values on VIN, VO, INA, INB, OUTA, OUTB, and STBY are all
referenced to GND, unless otherwise specified.
6) Guaranteed by characterization.
VO[ VIN(MAX ) ]  VO[ VIN(MIN ) ]
7) Line regulation =
( VIN(MAX )  VIN(MIN ) )  VO(NOM )
8) Load regulation =
MP161 Rev. 1.0
8/4/2017
 (% / V )
VO[IOUT(MAX ) ]  VO[IOUT(MIN ) ]
(IOUT (MAX )  IOUT (MIN ) )  VO(NOM )
 (% / mA)
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7
MP161 – INTEGRATED POWER SOLUTION FOR HOME/INDUSTRIAL AUTOMATION
TYPICAL CHARACTERISTICS
RDS(ON) vs. Temperature
5.0
4.8
4.6
4.4
4.2
4.0
3.8
3.6
3.4
3.2
3.0
1.6
1.4
RON Normalized to 25℃
Iregulator (mA)
Iregulator @ VDRAIN = 100V vs.
Temperature
1.2
1.0
0.8
0.6
0.4
0.2
0.0
-50
0
50
100
150
-50
0
Temperature (℃)
150
Tmaxon (MP161Ax) vs. Temperature
10.0
27.0
9.8
26.5
26.0
9.6
Tmaxon (μs)
Tminoff (μs)
100
Temperature (℃)
Tminoff (MP161Ax) vs. Temperature
9.4
9.2
25.5
25.0
24.5
9.0
24.0
-50
0
50
100
150
-50
0
Temperature (℃)
100
150
100
150
VCCSTBY vs. Temperature
5.9
12.6
5.8
VCC_STBY (V)
12.7
12.5
12.4
12.3
5.7
5.6
5.5
-50
0
50
Temperature (℃)
MP161 Rev. 1.0
8/4/2017
50
Temperature (℃)
VCCREF vs. Temperature
VCCref (V)
50
100
150
-50
0
50
Temperature (℃)
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8
MP161 – INTEGRATED POWER SOLUTION FOR HOME/INDUSTRIAL AUTOMATION
TYPICAL CHARACTERISTICS (continued)
TLEB1 vs. Temperature
VREF vs. Temperature
370.0
1.24
365.0
1.23
355.0
Vref (V)
TLEB1 (ns)
360.0
350.0
1.22
1.21
345.0
340.0
1.20
-50
0
50
100
Temperature (℃)
150
-50
100
150
100
150
VOVP vs. Temperature vs.
35.0
29.0
34.0
VOVP (V)
28.5
33.0
32.0
28.0
27.5
31.0
30.0
27.0
-50
0
50
100
150
-50
0
Temperature (℃)
50
Temperature (℃)
IQIN @ VIN = 5.5V vs. Temperature
VO (MP161x-5) vs. Temperature
0.25
5.1
0.23
5.1
0.21
VO (V)
IQIN (mA)
50
Temperature (℃)
V(BR)RD vs. Temperature
V(BR)RD (V)
0
0.19
5.0
5.0
0.17
0.15
4.9
-50
0
50
Temperature (℃)
MP161 Rev. 1.0
8/4/2017
100
150
-50
0
50
100
150
Temperature (℃)
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MP161 – INTEGRATED POWER SOLUTION FOR HOME/INDUSTRIAL AUTOMATION
TYPICAL PERFORMANCE CHARACTERISTICS
Performance waveforms are tested with the evaluation board in the Design Example section.
VIN = 230V, VOUT1 = 12V, IOUT1 = 70mA, VOUT2 = 5V, IOUT2 = 50mA, TA = 25°C, unless otherwise noted.
Normal Operation
Start-Up
Full Load
No Load
CH1: VDS
200V/div.
CH1: VDS
200V/div.
CH2: VOUT1
10V/div.
CH2: VOUT1
10V/div.
CH3: VOUT2
5V/div.
CH3: VOUT2
5V/div.
CH4: IL
200mA/div.
CH4: IL
200mA/div.
4μs/div.
4ms/div.
Start-Up
VOUT1 Short Circuit
Full Load
Full Load
CH1: VDS
200V/div.
CH1: VDS
200V/div.
CH2: VOUT1
10V/div.
CH2: VOUT1
10V/div.
CH3: VOUT2
5V/div.
CH3: VOUT2
5V/div.
CH4: IL
200mA/div.
CH4: IL
500mA/div.
10ms/div.
200ms/div.
VOUT2 Short Circuit
VOUT1 OVP
Full Load
No Load
CH1: VDS
200V/div.
CH1: VDS
200V/div.
CH2: VOUT1
10V/div.
CH2: VOUT1
10V/div.
CH3: VOUT2
5V/div.
CH3: VOUT2
5V/div.
CH4: IL
500mA/div.
CH4: IL
200mA/div.
200ms/div.
MP161 Rev. 1.0
8/4/2017
200ms/div.
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MP161 – INTEGRATED POWER SOLUTION FOR HOME/INDUSTRIAL AUTOMATION
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
Performance waveforms are tested with the evaluation board in the Design Example section.
VIN = 230V, VOUT1 = 12V, IOUT1 = 70mA, VOUT2 = 5V, IOUT2 = 50mA, TA = 25°C, unless otherwise noted.
VOUT1 OLP
Standby Entry
Full Load
No Load
CH1: VDS
200V/div.
CH1: VDS
200V/div.
CH2: VOUT1
10V/div.
CH2: VOUT1
10V/div.
CH3: VOUT2
5V/div.
CH3: VSTBY
5V/div.
CH4: IL
500mA/div.
CH4: IL
200mA/div.
200ms/div.
400ms/div.
Standby Recovery
Standby Entry
No Load
IOUT1 = 0A, IOUT2 = 50mA
CH1: VDS
200V/div.
CH1: VDS
200V/div.
CH2: VOUT1
10V/div.
CH2: VOUT1
10V/div.
CH3: VSTBY
5V/div.
CH3: VSTBY
5V/div.
CH4: IL
200mA/div.
CH4: IL
200mA/div.
4ms/div.
40ms/div.
Standby Recovery
Relay 1 Turn-On
IOUT1 = 0A, IOUT2 = 50mA
No Load
CH1: VDS
200V/div.
CH1: VDS
200V/div.
CH2: VOUT1
10V/div.
CH2: VOUTA
10V/div.
CH3: VSTBY
5V/div.
CH3: VINA
5V/div.
CH4: IL
200mA/div.
CH4: IL
200mA/div.
2ms/div.
MP161 Rev. 1.0
8/4/2017
200ms/div.
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11
MP161 – INTEGRATED POWER SOLUTION FOR HOME/INDUSTRIAL AUTOMATION
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
Performance waveforms are tested with the evaluation board in the Design Example section.
VIN = 230V, VOUT1 = 12V, IOUT1 = 70mA, VOUT2 = 5V, IOUT2 = 50mA, TA = 25°C, unless otherwise noted.
Relay 1 Turn-Off
Relay 2 Turn-On
No Load
No Load
CH1: VDS
200V/div.
CH1: VDS
200V/div.
CH2: VOUTA
10V/div.
CH2: VOUTB
10V/div.
CH3: VINA
5V/div.
CH3: VINB
5V/div.
CH4: IL
200mA/div.
CH4: IL
200mA/div.
200ms/div.
200ms/div.
Relay 2 Turn-Off
No Load
CH1: VDS
200V/div.
CH2: VOUTB
10V/div.
CH3: VINB
5V/div.
CH4: IL
200mA/div.
200ms/div.
MP161 Rev. 1.0
8/4/2017
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MP161 – INTEGRATED POWER SOLUTION FOR HOME/INDUSTRIAL AUTOMATION
PIN FUNCTIONS
SOIC-16
Pin #
Name
1
2
INB
INA
3
STBY
4, 14
5
6, 7, 12
GND
VO
NC
8
DRAIN
9
VCC
10
FB
11
SOURCE
13
VIN
15
16
OUTA
OUTB
MP161 Rev. 1.0
8/4/2017
Description
Logic input for relay driver – channel B.
Logic input for relay driver – channel A.
Logic input for standby mode control. Set STBY to the low-level input for normal
operation. Set STBY to the high-level input for standby operation.
Ground.
Low-dropout linear regulator output.
No connection.
Drain of the internal 700V MOSFET. DRAIN is also the input of the high-voltage
current source.
Power supply for the 700V switching regulator. VCC acts as the feedback input
when the internal fixed output is enabled or in standby mode.
Feedback input for the 700V switching regulator. Connect external resistors to FB
to implement the adjustable output. Otherwise, the internal fixed output is enabled.
Source of the internal 700V MOSFET.
Low-dropout linear regulator input. VIN is the power supply for the standby control
and relay driver circuit.
Relay driver output – channel A.
Relay driver output – channel B.
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MP161 – INTEGRATED POWER SOLUTION FOR HOME/INDUSTRIAL AUTOMATION
BLOCK DIAGRAM
Power Managment
VCC
FB
Feedback Control
Drain
Driving Signal
Managment
Peak Current
Limitation
INA
STBY
VIN
VO
GND
Source
Relay Driver
LDO
OUTA
INB
Relay Driver
OUTB
Figure 1: Functional Block Diagram
MP161 Rev. 1.0
8/4/2017
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MP161 – INTEGRATED POWER SOLUTION FOR HOME/INDUSTRIAL AUTOMATION
OPERATION
The MP161 integrates a 700V switching
regulator, a low-dropout linear regulator, and
relay drivers. The MP161 is an integrated
power stage solution for home automation,
industrial
automation,
and
any
other
applications that adopt relays and MCUs.
High Voltage (HV) Current Source and VCC
Under-Voltage Lockout (UVLO)
The internal high-voltage (HV) current source
regulates VCC by drawing current from DRAIN.
When VCC reaches VHVoff, the IC starts
switching, and the internal HV current source is
turned off. The internal HV current source turns
on again when VCC falls below VHVon.
During start-up under normal operation, the
MP161 VCC voltage is always regulated above
VHVon. A very small VCC capacitor can be used
(in the low μF or hundreds of nF range).
The MP161 implements soft start by decreasing
the minimal off time gradually in eight steps.
There are 640 switching cycles in the soft start.
During soft start, short-circuit protection (SCP)
and overload protection (OLP) are disabled.
Constant Voltage Operation
The MP161 integrates a 700V switching
regulator that regulates the output voltage by
detecting the feedback (FB). The internal
MOSFET is turned on when the FB voltage (VFB)
is lower than the reference voltage (VREF) and is
turned off based on the peak-current limitation
(see Figure 3). In this way, VFB is regulated at
VREF. The output voltage is determined in
Equation (1):
VO  Vref
Rup  Rlow
Rlow
(1)
VCC under-voltage lockout (UVLO) terminates
the switching when VCC is lower than VCCL to
prevent errors caused by an insufficient supply
voltage. The IC can shut down until VCC is
charged to VHVoff again. This does not occur,
typically, because the HV current source turns
on to supply VCC as soon as VCC drops to
VHVon, which prevents it from dropping to VCCL
(see Figure 2).
Figure 3: Constant Voltage Regulation
An internal resistor divider connected to VCC
and FB provides a fixed output feedback. The
lower resistor of the internal feedback divider is
450kΩ, typically.
To achieve an adjustable output, an external
feedback divider with a much smaller resistance
should be connected to FB so that the internal
feedback is overridden.
Figure 2: HV Current Source and VCC Operation
Soft Start (SS)
The MP161 starts switching with a soft-start
period when the device powers on or resumes
operation from a protection mode. Soft start
prevents the inductor current from overshooting.
MP161 Rev. 1.0
8/4/2017
A VCC capacitor is used for sampling and
holding the output voltage in addition to
supplying the IC operation.
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MP161 – INTEGRATED POWER SOLUTION FOR HOME/INDUSTRIAL AUTOMATION
Frequency and Peak Current Foldback
Due to the constant voltage regulation scheme
adopted by the MP161, its switching frequency
decreases as the load reduces. The MP161
peak current folds back along with the
switching frequency. As a result, the MP161 is
able to achieve excellent overall efficiency. The
switching frequency for continuous conduction
mode (CCM) can be calculated with Equation
(2):
fs 
(Vin  Vo ) Vo

2L(Ipeak  Io ) Vin
(2)
The switching frequency for discontinuous
conduction mode (DCM) can be calculated with
Equation (3):
fs 
2(Vin  VO ) Io Vo

LI2peak
Vin
(3)
When the switching frequency drops into the
audible frequency range under very light-load
condition, the peak current folds back to its
minimal value to minimize the audible noise.
Leading-Edge Blanking
An internal leading-edge blanking (LEB) unit
prevents premature switching pulse termination
due to a turn-on spike. The spike is mainly
caused by parasitic capacitance and reverse
recovery of the freewheeling diode (under
CCM).
Protections for the Switching Regulator
Whenever a protection condition is triggered,
the IC stops switching, the internal HV current
source is disabled, and the VCC capacitor is
discharged by ICCL. The internal HV current
source is not enabled again until VCC drops
below VCCpro.
The MP161 includes four types of protection.
1. Overload Protection (OLP): The maximum
output power of the switching regulator is
limited by the maximum switching frequency
and peak current limit. If the load exceeds
the power limit, the output voltage is not
able to stay in regulation. OLP is triggered
when the MOSFET off time is at the toffmin
limitation (which indicates that the switching
frequency has reached the maximum) for
MP161 Rev. 1.0
8/4/2017
8192 consecutive cycles. The validation
time for OLP is able to prevent tripping
during start-up and transient periods.
2. Short-Circuit Protection (SCP): If the current
flowing through the internal MOSFET after
LEB2 is higher than the SCP threshold,
SCP is triggered immediately. SCP is
disabled during soft start.
3. Over-Temperature Protection (OTP): To
prevent any thermal-induced damage, the
MP161 is shut down when the junction
temperature exceeds the thermal shutdown
threshold. There is also a hysteresis
implemented for OTP, so the chip does not
recover until the junction temperature drop
exceeds the thermal shutdown recovery
hysteresis.
4. Brown-Out Protection (BOP): If the turn-on
time hits the maximum limitation for four
consecutive cycles, BOP is triggered.
Low-Dropout Linear Regulator (LDO)
The MP161 integrates a low-dropout linear
regulator (LDO). Usually, the LDO input (VIN) is
connected to the output of the switching
regulator. VIN can adapt to any input voltage
below VOVP. The output voltage of the LDO is
internally fixed with two options for fixed voltage
outputs (5V and 3.3V).
The LDO itself also implements OTP, which is
independent from the switching regulator.
However, the protection scheme is similar to
the switching regulator’s scheme.
Relay Drivers
The MP161 integrates two channels of relay
drivers, which are compatible to 3.3 - 5V COMS
logic and TTL logic interface.
A low-impedance MOSFET is used to drive the
relay (see Figure 4). There is also an integrated
freewheeling diode to take over the relay coil
current when the MOSFET turns off. An R-C
filter is implemented internally for each channel
to improve noise immunity. The drivers also
feature an internal pull-down resistor to allow
for tri-state input and normal off operation.
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MP161 – INTEGRATED POWER SOLUTION FOR HOME/INDUSTRIAL AUTOMATION
VIN
OUTx
INx
GND
Figure 4: Block Diagram of Internal Relay Driver
OVP on VIN
A propriety OVP feature is implemented in the
MP161. When the voltage on VIN exceeds VOVP,
the switching regulator is shut down to stop
energy from flowing to the output any further.
There is also an internal current pulled from VIN
to help discharge the external capacitor when
OVP is triggered. This protection feature can
prevent damage on critical loads from overstress when VIN regulation fails.
MP161 Rev. 1.0
8/4/2017
Standby Mode Operation
The MP161 can switch between normal
operation mode and standby mode according to
the input on STBY. When STBY is low, the
MP161 works in normal mode, and the output
voltage of the switching regulator is regulated
based on VCCREF (fixed output) or VREF
(adjustable output). When STBY is high, the
chip works in standby mode, and the switching
regulator output is regulated at VCCSTBY.
Standby mode is used to save power by
reducing the switching regulator output voltage
when the load on this output rail is idle.
When entering standby mode, the VCC
regulating voltage drops step-by-step to keep
the output properly regulated. There is also a
soft-start procedure when exiting standby mode.
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MP161 – INTEGRATED POWER SOLUTION FOR HOME/INDUSTRIAL AUTOMATION
APPLICATION INFORMATION
Selecting the Input Capacitor
The input capacitor supplies DC input voltage to
the converter. Figure 5 shows the typical DC
bus voltage waveform of the half-wave rectifier
and full-wave rectifier.
Vin
Po max  Vo (ILimit 
VDC(min)
Po max 
t
VDC( min)
1 2
1
LILimit
2
min off
(5)
Selecting the Freewheeling Diode
The diode should be selected based on the
maximum input voltage and peak current.
DC input voltage
AC input voltage
t
Figure 5: Input Voltage Waveform
Typically, the use of a half-wave rectifier
requires an input capacitor rated at 3µF/W for
the universal input condition. When using a fullwave rectifier, the input capacitor is rated at 1.5
~ 2µF/W for the universal input condition. The
half-wave rectifier is recommended for <2W
output applications. The full-wave rectifier is
recommended for >2W output applications.
Avoid using an input capacitor that is too small,
since it may not be able to hold the DC voltage
high enough. A low DC input voltage can lead
to bad thermal performance. If the input voltage
is very low, the MOSFET on time may reach
Tmaxon, triggering brown-out protection.
Selecting the Inductor
The MP161 has a minimum off-time limit that
determines the maximum output power. The
maximum power increases as the inductor
increases. Using a very small inductor may
cause not enough output power, but a larger
inductor leads to an inappropriate OLP point.
Select an inductor with a minimum value that
can meet the overload requirement. The
tolerance of the peak-current limit and minimum
off time should also be considered for mass
production.
MP161 Rev. 1.0
8/4/2017
(4)
To reduce costs, use a standard off-the-shelf
inductor no less than the calculated value.
AC input voltage
VDC(max)
Vo min off
)
2L
Estimate the OLP point for DCM with Equation
(5):
VDC(max)
DC input voltage
Vin
Estimate the OLP point for CCM with Equation
(4):
The freewheeling diode’s reverse recovery can
affect efficiency and circuit operation for CCM.
Use an ultra-fast reverse recovery diode, such
as the UGC10JH.
Selecting the Output Capacitor
An output capacitor is required to maintain the
DC output voltage. Estimate the output voltage
ripple for CCM with Equation (6):
VOUT _ ripple 
i
 iRESR
8fsCo
(6)
Estimate the output voltage ripple for DCM with
Equation (7):
2
VOUT _ ripple
I I I 
 o  pk o   IpkRESR
fsCo  Ipk 
(7)
Low ESR electrolytic or ceramic capacitors are
recommended to reduce the output voltage
ripple if necessary.
External Feedback Resistors
For adjustable output configurations, the total
external resistance should not exceed 100kΩ to
override the internal feedback resistor divider.
The external resistor value can also be adjusted
to meet the output voltage target if large
external resistors are preferred.
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MP161 – INTEGRATED POWER SOLUTION FOR HOME/INDUSTRIAL AUTOMATION
Feedback Capacitor
The feedback capacitor provides a sample-andhold function. For both fixed and adjustable
output setups, VCC is used as the feedback
capacitor.
A
1µF
VCC
capacitor
is
recommended, typically, but the optimized VCC
capacitor may vary in different applications. A
large VCC capacitor is preferred since it results
in small no-load consumption and good lightload regulation, and also helps increase the
hiccup duration during protections. However,
stability may be affected when the feedback
capacitor is too large.
Dummy Load
A dummy load is required to maintain the
switching regulator output voltage under noload condition. The switching regulator delivers
a certain amount of power under no-load
condition due to a minimum switching
frequency determined by the feedback R-C
discharge rate. This power is dissipated by the
dummy load so that output voltage does not run
away.
A large dummy load current leads to better
regulation but larger no-load consumption. The
current is a compromise between small no-load
consumption and good no-load regulation.
Typically, a resistor is used as a dummy load.
In Figure 7, the dummy load resistor is not used
because there is already ~250µA of
consumption current on VIN, which can act as a
dummy load.
Surge Performance
The input capacitor can also be used for surge
suppression. There is no need to use other
surge
suppression
components
if
an
appropriate input capacitor value is chosen.
Figure 6 shows the typical half-wave rectifier
used in low-power offline applications. Table 2
shows the capacitance required under normal
conditions for different surge levels. FR1 is a
20Ω/2W fused resistor, and L1 is 1mH for this
recommendation.
MP161 Rev. 1.0
8/4/2017
L
FR1
L1
C1
C2
N
Figure 6: Half-Wave Rectifier
Table 2: Recommended Capacitance
Surge
Voltage
C1
C2
500V
1000V
2000V
1μF
1μF
2.2μF
2.2μF
3.3μF
3.3μF
Input and Output Capacitors of LDO
Place an input ceramic capacitor (1 - 10µF)
between VIN and GND. A larger value in this
range improves the line transient response.
Place an output ceramic capacitor (1 - 10µF)
between VO and GND. A larger value in this
range improves load transient response.
Relay
The coil of relay is connected between VIN and
VOUTx.
PCB Layout Guidelines
Efficient PCB layout is critical for stable
operation, good EMI, and good thermal
performance. For best results, follow the
guidelines below.
1) Minimize the loop area formed by the input
capacitor,
700V
switching
regulator,
freewheeling diode, inductor, and output
capacitor.
2) Place the power inductor far away from the
input filter while keeping the loop area to a
minimum.
3) Place a bypass capacitor around 47pF
between FB and SOURCE as close to the
IC as possible.
4) Connect a large copper area to GND for
better LDO thermal performance.
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MP161 – INTEGRATED POWER SOLUTION FOR HOME/INDUSTRIAL AUTOMATION
Design Example
Table 3 shows a design example for the
following application guideline specifications.
Table 3: Design Example
VIN
VOUT1
IOUT1
VOUT2
IOUT2
85VAC to 265VAC
12V
70mA
5V
50mA
The detailed application schematic is shown in
Figure 7. The typical performance and circuit
waveforms are shown in the Typical
Performance Characteristics section. For
additional device applications, please refer to
the related evaluation board datasheet.
MP161 Rev. 1.0
8/4/2017
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MP161 – INTEGRATED POWER SOLUTION FOR HOME/INDUSTRIAL AUTOMATION
TYPICAL APPLICATION CIRCUIT
1
N
1
P
D
N
INB
1
6
5
2
4
1
D
N
3
1
VIN
D
N
2
1mH
1
2
F
p
7
C
VCC
1
0
4
5
6
7
100μF/25V
C
C
N
C
F
μ
5
5
D
STTH1R06
1
7
D
N
D
N
G
N
G
C
N
1N4007
D
6
D
D
3.3μF/400V
3.3μF/400V
C
N
C
N
C
4
C
1
N
3
R
C
85~265VAC
N
RV1
CX1
N
C
N
C
R
6
C
C
9
C
C
1
R
N
N
F
μ
1
C
N
1N4007
R
MP161AGS-5
R
C
2
C
4
D
3
D
Drain
N
9
8
L
4
B
F
R
3
C
1
F
39/1W
L
Source
VOUT1
0
12V/70mA
1
1
1
5V/50mA
L
1mH
O
V
5
V
5
1N4007
4.7μF
VOUT2
G
4
G
F
μ
1
8
C
C10
D
N
G
3
STBY
STBY
D
N
G
D
OUTA
1
OUTB
1
1
1
2
INA
INA
INB
INB
U
2
SW3
Header
5
3
4
3
4
INB
INA
1
2
4
INA
SW2
3
STBY
2
G
D
N
G
1
VOUT2
V
5
STBY
1
2
V
2
2
5
SW1
1
2
C
T
U
O
V
Relay1
1
2
N
1
2
Relay2
1
C
T
U
O
V
Figure 7 shows a typical application example of a 12V/70mA and 5V/50mA non-isolated power supply
using the MP161AGS-5.
Figure 7: Typical Application with 12V/70mA, and 5V/50mA Output
MP161 Rev. 1.0
8/4/2017
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MP161 – INTEGRATED POWER SOLUTION FOR HOME/INDUSTRIAL AUTOMATION
FLOW CHART
Power On
Y
HV Current Source
On
VCC < VCCPRO
N
Y
N
VCC<VHVON
VCC<VCCL
Y
Stop Operation
N
Shut Down
HV Current Source
N
Counts to 8192 ?
VCC>VHVOFF
Y
N
OVP, TSD,
SCP Fault
?
N
OLP Counter +1
Y
Normal
Operation ?
N
Y
Y
Y
TON = TMINOFF ?
N
Reset Counter
Soft Start
VFB >2.5 ?
STBY = 1 ?
Y
Turn On the
MOSFET
Soft Start
IDS > IPEAK ?
Regulate
VOUT = VCC = VSTBY
N
Y
Turn Off the
MOSFET
N
Y
STBY = 0 ?
N
N
Y
Figure 8: Control Flow Chart
MP161 Rev. 1.0
8/4/2017
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MP161 – INTEGRATED POWER SOLUTION FOR HOME/INDUSTRIAL AUTOMATION
SIGNAL SEQUENCE
Normal
Operation
Power On
Unplug from
Main Input
VOUT
VHVOFF
VHVON
VCC
VCCL
VCCPRO
Driver
Pulses
8192
cycles
Driver
HV Current
Source
Fault Flag
VIN Over Voltage
Fault
Over-Load Over-Load
Fault
Fault
Counter<8192 Counter=8192
Brown Out Fault
Short Circuit
Fault
Thermal Shutdown
Fault
Figure 9: Signal Evolution in the Presence of a Fault
MP161 Rev. 1.0
8/4/2017
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MP161 – INTEGRATED POWER SOLUTION FOR HOME/INDUSTRIAL AUTOMATION
PACKAGE INFORMATION
SOIC-16
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.
MP161 Rev. 1.0
8/4/2017
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24