MP44014GS-Z Datasheet MP44014GS-Z | P10-P12

MP44014 – BOUNDARY MODE PFC CONTROLLER

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OPERATION

The MP44014 is a boundary conduction mode

PFC controller optimized for the PFC pre-

regulator up to 300W and fully complies with

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 accurate on-chip reference voltage and the

high performance error amplifier regulate the

output voltage accurately.

Over-Voltage Protection (OVP)

The MP44014 offers two stages of over-voltage

protection: dynamic over-voltage protection and

static over-voltage protection. With two-stage

protection, the circuit operates reliably.

The MP44014 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 calculated

with Equation (1):

OFB

R9 R10





(1)

If there is an abrupt rise on the output (ΔV

) and

the compensation network connected between

FB and COMP takes time to achieve 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

/R10. However, the current through R9 is

calculated with Equation (2):

OOFB

VVV

 



(2)

This current has to flow into COMP.

Simultaneously, this current is monitored inside

the chip. If the current rises to 35µA, the output

voltage of the multiplier will be forced to decrease,

and the energy delivered to the output will be

reduced. If this current continues to rise to about

40µA, the dynamic OVP can 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 starter will be re-enabled and allow

the switching to restart.

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, static OVP will be triggered.

Consequently, the gate driver will be blocked to

turn off the external power MOSFET, and the

device will enter an idle state. Normal operation

resumes once the error amplifier output returns

to the regulated region (see Figure 2).

Figure 2: OVP Detector Block

Disable Function

The MP44014 can be disabled by pulling the

zero-current sensing (ZCS) pin lower than

190mV. This helps to further reduce quiescent

current when the PFC pre-regulator needs to be

shut down. After releasing ZCS, it will stay at a

lower clamp voltage when there is no external

voltage from the auxiliary winding (see Figure 3).

Figure 3: ZCS Triggering and Disable Block

MP44014 – BOUNDARY MODE PFC CONTROLLER

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Boundary Conduction Mode

When the current of the boost inductor reaches

zero, the voltage on the inductor is reversed.

ZCS then 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 ZCS voltage rises above 2.1V, the

comparator waits until the voltage falls below

1.6V. Once the voltage falls below 1.6V, the

MP44014 turns on the MOSFET. The 7.8V high

clamp and 0.55V low clamp protect 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 ZCD during start-up.

Zero-Crossing Compensation

The MP44014 offers 30mV voltage offset for the

multiplier output near the zero crossing of the line

voltage (which can force the circuit to process

more energy at the bottom of the line voltage).

With this function, the THD of the current is

reduced.

To prevent redundant energy, this offset is

reduced as the instantaneous line voltage

increases. Therefore the offset will be negligible

near the top of the line voltage.

Power Factor Correction

The MP44014 senses the inductor current

through the current sense pin and compares it

to the sinusoidal-shaped 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 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 also sinusoidal

shaped. A high power factor can be achieved

through this control method (see Figure 4).

Multiplier output

Inductor curr ent

Input aver age cur rent

Figure 4: Inductor Current Waveform

The control flow chart of the MP44014 is shown

in Figure 5.

Figure 5: Control Flow Chart

MP44014 – BOUNDARY MODE PFC CONTROLLER

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.

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PACKAGE INFORMATION

SOIC-8

0.016(0.41)

0.050(1.27)

-8

DETAIL "A"

0.010(0.25)

0.020(0.50)

x 45

SEE DETAIL "A"

0.0075(0.19)

0.0098(0.25)

0.150(3.80)

0.157(4.00)

PIN 1 ID

0.050(1.27)

BSC

0.013(0.33)

0.020(0.51)

SEATING PLANE

0.004(0.10)

0.010(0.25)

0.189(4.80)

0.197(5.00)

0.053(1.35)

0.069(1.75)

TOP VIEW

FRONT VIEW

0.228(5.80)

0.244(6.20)

SIDE VIEW

RECOMMENDED LAND PATTERN

0.213(5.40)

0.063(1.60)

0.050(1.27)

0.024(0.61)

NOTE:

1) CONTROL DIMENSION IS IN INCHES. DIMENSION IN

BRACKET IS IN MILLIMETERS.

2) PACKAGE LENGTH DOES NOT INCLUDE MOLD FLASH,

PROTRUSIONS OR GATE BURRS.

3) PACKAGE WIDTH DOES NOT INCLUDE INTERLEAD FLASH

OR PROTRUSIONS.

4) LEAD COPLANARITY (BOTTOM OF LEADS AFTER FORMING)

SHALL BE 0.004" INCHES MAX.

5) DRAWING CONFORMS TO JEDEC MS-012, VARIATION AA.

6) DRAWING IS NOT TO SCALE.

0.010(0.25) BSC

GAUGE PLANE

P1-P3 P4-P6 P7-P9 P10-P12

MP44014GS-Z

Mfr. #:

Buy MP44014GS-Z

Manufacturer:

Monolithic Power Systems (MPS)

Description:

Power Factor Correction - PFC Boundary Mode PFC Controller

Lifecycle:

New from this manufacturer.

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MP44014GS-Z