MP44014-A
Boundary Mode PFC Controller
The Future of Analog IC Technology
DESCRIPTION
The MP44014-A is a boundary conduction
mode PFC controller that provides simple and
high-performance active power-factor correction
using minimum external components.
The output voltage is regulated accurately by a
high-performance voltage-mode amplifier with
an accurate internal voltage reference.
FEATURES
The precise adjustable output over-voltage
protection greatly enhances the system
reliability.
The on-chip R/C filter on the current sense pin
can potentially eliminate the external R/C filter.
The extremely low start-up current, quiescent
current, and the disable function reduces the
power consumption, resulting in excellent
efficiency performance.
The MP44014-A is available in a SOIC-8.
Boundary Conduction Mode PFC Controller
for Pre-Regulator
Zero-Crossing Compensation to Minimum
THD of AC Input Current
Precise Adjustable Output Over-Voltage
Protection
Ultra-Low (15μA) Start-Up Current
Low Quiescent Current (0.46mA) at OVP
Condition
On-Chip Filter on Current Sense Pin
Enable/Disable and Open-Loop Protection
Function on FB
-750/+800mA Peak Gate-Drive Current
APPLICATIONS
Offline Adaptors
Electronic Ballasts
LLC Front End
Other PFC Pre-Regulators
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.
TYPICAL APPLICATION
MP44014-A Rev. 1.01
www.MonolithicPower.com
11/10/2015
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1
MP44014-A – BOUNDARY MODE PFC CONTROLLER
ORDERING INFORMATION
Part Number
Package
SOIC-8
MP44014-AGS*
Top Marking
See Below
* For Tape & Reel, add suffix –Z (e.g. MP44014-AGS–Z).
TOP MARKING
M44014-A: Product Code of MP44014-AGS
LLLLLLLL: Lot Number
MPS: MPS Prefix
Y: Year Code
WW: Week Code
PACKAGE REFERENCE
1
FB
VCC
8
2
COMP
GATE
7
3
MULT
GND
6
4
CS
ZCS
5
MP44014-A Rev. 1.01
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MP44014-A – BOUNDARY MODE PFC CONTROLLER
ABSOLUTE MAXIMUM RATINGS (1)
Thermal Resistance
Supply Voltage VCC .............. -0.5V to Self Limit
Zero Current Sensing (ZCS) . -0.3V to Self Limit
Other Analog Inputs and Outputs -0.3V to 6.5V
ZCS Max. Current .....................-2.0mA to 10mA
Continuous Power Dissipation (TA = +25°C) (2)
SOIC8 ........................................................ 1.4W
Junction Temperature………………… …..150C
Lead Temperature (Solder).......................260C
Storage Temperature............... -55C to +150C
SOIC-8 ....................................90 ...... 45 ... C/W
Recommended Operating Conditions
(3)
Supply Voltage VCC ......................13.8V to 21V
Operating Junction Temp. (TJ). -40°C to +125°C
(4)
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 allowable continuous power dissipation at
any
ambient
temperature
is
calculated
by
Exceeding
the
maximum
D(MAX)=(TJ(MAX)-TA)/θJA.
allowable power dissipation produces an excessive die
temperature, causing the regulator to go into thermal
shutdown. Internal thermal shutdown circuitry 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.
MP44014-A Rev. 1.01
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11/10/2015
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MP44014-A – BOUNDARY MODE PFC CONTROLLER
ELECTRICAL CHARACTERISTICS
VCC = 15V, TJ = -40C~+125C, unless otherwise noted
Parameter
Supply Voltage
Operating Range
Turn-On Threshold
Turn-Off Threshold
Hysteresis
Zener Voltage
Supply Current
Start-Up Current
Quiescent Current
Operating Current
Symbol
Quiescent Current
Iq
Multiplier
Input Bias Current
Linear Operation Range
Output Max. Slope
Gain(5)
VCC
VCC_on
VCC_off
VCC_hys
Vz
Istartup
Iq
Icc
IMULT
VMULT
ΔVCS/ΔVMULT
K
Condition
Min
After Turn-On
10.7
11
8.7
2.0
22
ICC=20mA
VCC=11V
No Switch
Fs =70kHz, CLOAD=1nF
During OVP (Either Static or
Dynamic)
or VFB ≤150mV
Typ
Max
Units
25
21
13.8
10.8
3.1
28
V
V
V
V
V
15
2.5
3.5
40
3.2
4.5
µA
mA
mA
0.46
0.7
mA
-1
3
µA
V
12.4
9.8
VMULT=3V
0
VMULT=0~0.6V
VCOMP=Upper Clamp
1.0
1.10
VMULT=1V,VCOMP=4V, TJ = 25C
0.32
0.38
0.45
1/V
TJ = 25C
2.465
2.5
2.535
V
2
5
mV
1
µA
-6.9
mA
V/V
Error Amplifier
Feedback Voltage
Feedback Voltage Line Regulation
Feedback Bias Current
Source Current
VFB
VFB_LR
IFB
ICOMP_source
VCC=10.7V to 21V
VFB=0~2.6V
VCOMP=4V, VFB=2.4V, TJ = 25C
-2.7
-4.7
Sink Current
ICOMP_sink
VCOMP=4V, VFB=2.6V, TJ = 25C
3
5
Upper Clamp Voltage
VCOMP_H
VFB=2V, Isource=-0.5mA
5.3
6
6.6
V
Lower Clamp Voltage
VCOMP_L
VFB=3V, Isink=0.5mA
2.0
2.15
2.3
V
FB_Disable Threshold
VFB_DIS
150
200
250
mV
FB_EN Hysteresis
VFB_EN_hys
250
Current-Sense Comparator
Input Bias Current
Turn-Off Delay
LEB Time
Current-Sense Clamp Voltage
VCS_Clamp
Current-Sense Offset
VCS_Offset
VMULT=0V
VMULT=2.5V
Zero Current Sensor
Upper Clamp Voltage
VZCSclamp_H
IZCS=2.5mA
ICS
TDT
TLEB
mA
VCS=6.5V
VMULT=0.2V
VMULT=0.2V
mV
-1
40
1.06
7.2
175
80
1.14
25
6
7.8
MP44014-A Rev. 1.01
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1.22
µA
ns
ns
V
mV
mV
8.7
V
4
MP44014-A – BOUNDARY MODE PFC CONTROLLER
ELECTRICAL CHARACTERISTICS (continued)
VCC = 15V, TA = TJ = -40C~+125C, unless otherwise noted.
Parameter
Lower Clamp Voltage
Zero-Current Sensing Threshold
Re-Start Current After Disable
Re-Starter
Re-Start Time
Over-Voltage
Dynamic OVP Current
Hysteresis
Static OVP Threshold
Gate Driver
Output High Voltage
Symbol
Condition
Min
Typ
Max
Units
-0.3
0
55
-0.15
1.4
0.7
85
V
V
V
µA
Tstart
80
175
280
µs
IOVP
23.5
30.5
IOVP_Hys
VOVP
2.1
27
20
2.25
µA
µA
V
11.5
12.5
VZCSclamp_L IZCS=-2.5mA
VZCS_H
VZCS Rising
VZCS_L
VZCS Falling
IZCS_res
VOH
IGDsource=20mA
VOL
Tf
Tr
VD_max
IGDsink=200mA
Output Low Voltage
Voltage Fall Time
Voltage Rise Time
Max. Output Drive Voltage
Source Current Capability
Sink Current Capability
IGate_source
IGate_sink
UVLO Saturation Voltage
VSaturation
12
0.9
30
40
13.5
-750
800
VCC=0 to VCC_ON,
IGate_sink=10mA
2.4
V
1.9
70
80
15.5
V
ns
ns
V
mA
mA
0.3
V
Note:
5) The multiplier output is given by: Vcs=K·VMUTL·(VCOMP-2.5)
MP44014-A Rev. 1.01
www.MonolithicPower.com
11/10/2015
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© 2015 MPS. All Rights Reserved.
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MP44014-A – BOUNDARY MODE PFC CONTROLLER
TYPICAL PERFORMANCE CHARACTERISTICS
10
100
14
10
1
0.1
0.01
0.001
0
5
10
15
20
25
30
28
VCC THRESHOLD(V)
SUPPLY CURRENT(mA)
OPERATING
NON OVP
1
OVP
0.1
START-UP
0.01
-50
0
50
100
150
13
RISING
12
11
FALLING
10
9
8
-50
2.6
250
2.55
200
2.5
150
2.45
100
0
50
100
150
0
50
100
150
0
50
100
150
26
24
22
20
-50
0
50
100
150
35
2.4
-50
1.2
1
0
50
100
150
UPPER
CLAMP
50
-50
0.6
30
0.8
0.4
0.6
25
0.4
0.2
20
0.2
15
-50
0
50
100
150
0
0 0.5 1 1.5 2 2.5 3 3.5 4
0
-50
MP44014-A Rev. 1.01
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MP44014-A – BOUNDARY MODE PFC CONTROLLER
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
10
13
3.5
8
12
3
2.5
6
2
10
4
1.5
2
1
8
0
-2
-50
0.5
0
50
100
150
6
0
100
200
300
400
500
0
0
100
200
MP44014-A Rev. 1.01
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11/10/2015
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300
400
500
7
MP44014-A – BOUNDARY MODE PFC CONTROLLER
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
VOUT
AC Coupled
5V/div.
VOUT
AC Coupled
5V/div.
VREC
100V/div.
VREC
100V/div.
VREC
100V/div.
IL
1A/div.
IL
1A/div.
IL
1A/div.
VOUT
AC Coupled
5V/div.
IL
1A/div.
VOUT
100V/div.
VOUT
100V/div.
VREC
100V/div.
VREC
100V/div.
IL
2A/div.
IL
2A/div.
VZCS
5V/div.
VGATE
20V/div.
35
30
VREC
20V/div.
25
20
VGATE
20V/div.
15
10
IL
500mA/div.
IEC 1000-3-2 Class C
MP44014-B Design Example
5
0
3 7 11 15 19 23 27 31 35 39
MP44014-A Rev. 1.01
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11/10/2015
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MP44014-A – BOUNDARY MODE PFC CONTROLLER
PIN FUNCTIONS
Pin #
Name
1
FB
2
COMP
3
MULT
4
CS
5
ZCS
6
GND
7
GATE
8
VCC
Description
Feedback. The output voltage is fed into FB through a resistor divider. Also, FB can be used
as an enable and disable pin.
Output of the Error Amplifier. A compensation network is connected between COMP and FB.
Input of the Multiplier. Connect MULT to the rectified main voltage via a resistor divider to
provide the sinusoidal reference for the current control loop.
Current Sense. The current through the MOSFET is fed into CS via a resistor. The resulting
voltage on CS is compared with the output of the internal multiplier to get an internal
sinusoidal-shaped reference, which determines the MOSFETs turn-on signal. The on-chip
RC filter reduces high-frequency noise on CS.
The Zero-Crossing Current-Sensing Input of the Inductor. A negative-transition edge triggers
the MOSFETs turn-on signal.
Ground.
Gate Driver Output. The high output current of the gate driver is able to drive the low-cost
power MOSFET. The high-level voltage of GATE is clamped to 12V in case GATE is supplied
with a high VCC.
Supply Voltage of Both the Signal Path of the IC and the Gate Driver. A bypass capacitor
from VCC to ground is needed to reduce noise.
MP44014-A Rev. 1.01
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MP44014-A – BOUNDARY MODE PFC CONTROLLER
FUNCTIONAL BLOCK DIAGRAM
ZCS
Internal Bias
Starter
Voltage
Regulator
VCC
-
Driver
UVLO
+
Vref -
+
Enable/Disable
Over-Voltage
Detection
-
1.5pF
-
Multiplier
GND
+
LEB
80k
CS
0.2V
0.45
S Q
R
+
GATE
+
1.4V
0.7V
MULT
FB
2.5V
COMP
FIGURE 1. Functional Block Diagram
MP44014-A Rev. 1.01
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MP44014-A – BOUNDARY MODE PFC CONTROLLER
OPERATION
The MP44014-A is a boundary conduction mode
PFC controller that is optimized for the PFC preregulator up to 300W and fully complies with the
IEC1000-3-2 specification.
Output-Voltage Regulation
The output voltage is sensed at FB through a
resistor divider from the output voltage to ground.
The on-chip reference voltage and the highperformance error amplifier regulate the output
voltage accurately.
Over-Voltage Protection (OVP)
The MP44014-A offers two stages of overvoltage
protection:
dynamic
over-voltage
protection and static over-voltage protection.
With two-stage protection, the circuit operates
reliably.
starter will be re-enabled and allow the switching
to re-start.
When the load is very light, the output voltage
tends to stay steadily above the nominal value. In
this condition, the error amplifier output will
saturate low. When the error amplifier output is
lower than 2.25V, the static OVP is triggered.
Consequently, the gate driver is blocked to turn
off the external power MOSFET, and the device
enters an idle state. Normal operation resumes
once the error amplifier output goes back into the
regulated region (see Fig. 2).
UVLO
Driver
Vo
IR9
VO VFB
V
IR10 FB
R9
R10
If there is an abrupt rise on the output (ΔVO), the
compensation network connected between FB
and COMP takes time to achieve a high-power
factor (PF), due to the long RC time constant.
The voltage on FB will still be kept at the
reference value. The current through R10
remains equal to VFB/R10, but the current through
R9 will become:
'
IR9
VO VO VFB
R9
This current has to flow into COMP. At the same
time, this current is monitored inside the chip. If
the current rises to 25µA, the output voltage of
the multiplier will be forced to decrease, and the
energy delivering to output will be reduced. If this
current continues to rise (to about 27µA), the
dynamic OVP could be triggered. Consequently,
the gate driver is blocked to turn off the external
power MOSFET, and the device enters an idle
state. This state is maintained until the current
falls below 10µA, the point at which the internal
IR9
Over-Voltage
Detection
R9
FB
-
Multiplier
+
The MP44014-A achieves OVP by monitoring the
current flow through COMP.
During steady-state operation, the current flow
through the high-side feedback resistor (R9) and
the low-side feedback resistor (R10) is:
GATE
MULT
2.5V
IR10
R10
COMP
FIGURE 2. OVP Detector Block
Disable/Enable or OLP Function
The MP44014-A can be disabled by pulling FB
lower than 200mV. This helps reduce quiescent
current when the PFC pre-regulator needs to
shut down. To enable the IC, the voltage on FB
must exceed 0.45V. This function is used mainly
as a remote on/off control input that is driven by a
PWM controller for power management purposes.
Also, FB acts as an open-loop protection for
safety purposes. The IC shuts off PWM if the
lower resistor of the output divider is shorted to
ground or if the upper resistor is missing or fails
to open.
Boundary Conduction Mode
When the current of the boost inductor reaches
zero, the voltage on the inductor is reversed.
Then ZCS generates the turn-on signal of the
MOSFET by sensing the falling edge of the
voltage on the auxiliary winding coupled with the
inductor. If the voltage of ZCS rises above 1.4V,
the comparator waits until the voltage falls
MP44014-A Rev. 1.01
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MP44014-A – BOUNDARY MODE PFC CONTROLLER
below 0.7V. Once the voltage falls below 0.7V,
the MP44014-A turns on the MOSFET. The 7.8V
high clamp protects ZCS. The internal 175µs
timer generates a signal to turn on the MOSFET
if the driver signal has been low for more than
175µs. This also allows the MOSFET to turn on
during the start-up period since no signal is
generated from ZCS.
Zero-Crossing Compensation
The MP44014-A offers a 30mV voltage offset for
the multiplier output near the zero-crossing of the
line voltage. This forces the circuit to process
more energy at the bottom of the line voltage.
With this function, the THD of the current is
reduced.
the sinusoidal-shaped signal, the external power
MOSFET begins to turn off, and the diode turns
on. Also, the inductor current begins to fall. When
the inductor current reaches zero, the power
MOSFET begins to turn on again, which causes
the inductor current to start rising again. The
power circuit works in boundary conduction mode,
and the envelope of the inductor current is
sinusoidal-shaped. The average input current is
half of the peak current, so the average input
current is sinusoidal-shaped as well (see Fig. 3).
A high-power factor can be achieved through this
control method.
Multiplier output
Inductor current
To prevent redundant energy, this offset is
reduced as the instantaneous line voltage
increases. Therefore, the offset is negligible near
the top of the line voltage.
Power Factor Correction
The MP44014-A senses the inductor current
through CS and compares it to the sinusoidalshaped signal (which is generated from the
output of the multiplier). When the external power
MOSFET turns on, the inductor current rises
linearly. When the peak current hits
Input average current
FIGURE 3. Inductor Current Waveform
The control flow chart of the MP44014-A is
shown in Fig. 4.
FIGURE 4. Control Flow Chart
MP44014-A Rev. 1.01
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MP44014-A – BOUNDARY MODE PFC CONTROLLER
PACKAGE INFORMATION
SOIC-8
NOTICE: The information in this document is subject to change without notice. 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.
MP44014-B Rev. 1.01
www.MonolithicPower.com
11/10/2015
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