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PDF MP4021 Data sheet ( Hoja de datos )

Número de pieza MP4021
Descripción Primary Side Control Offline LED Controller
Fabricantes MPS 
Logotipo MPS Logotipo



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The Future of Analog IC Technology
MP4021
Primary Side Control
Offline LED Controller with Active PFC
DESCRIPTION
The MP4021 is a primary-side–control offline
LED lighting controller that achieves high power
factor and accurate LED current for isolated
single-power-stage lighting applications in a
single SOIC8 package. The proprietary real-
current control method accurately controls LED
current from primary-side information. Eliminating
the secondary-side feedback components and
the optocoupler significantly simplifies the LED
lighting system design.
The MP4021 integrates power factor correction
and works in boundary conduction mode to
reduce the MOSFET switching losses.
The extremely low start-up current and quiescent
current reduces the total power consumption and
provides a high-efficiency solution for lighting
applications.
The multi-protection features of MP4021 greatly
enhance system reliability and safety. The
MP4021 features over-voltage protection, short-
circuit protection, cycle-by-cycle current limiting,
VCC UVLO, and auto-restart over-temperature
protection.
FEATURES
Real current control without secondary-
feedback circuit
Unique architecture for superior line
regulation
High power factor0.9 over universal input
voltage
Boundary conduction mode improves
efficiency
Ultra-low (20µA) start-up current
Low (1mA) quiescent current
Input UVLO
Cycle-by-cycle current limit
Over-voltage protection
Short-circuit protection
Over-temperature protection
Available in an SOIC8 package
APPLICATIONS
Solid-state lighting
Industrial and commercial lighting
Residential lighting
All MPS parts are lead-free and adhere to the RoHS directive. For MPS green
status, please visit MPS website under Products, Quality Assurance page.
“MPS” and “The Future of Analog IC Technology” are registered trademarks of
Monolithic Power Systems, Inc.
The MP4021 is under patent pending.
TYPICAL APPLICATION
MP4021 Rev.1.11
11/23/2011
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2011 MPS. All Rights Reserved.
1

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MP4021 pdf
MP4021—PRIMARY SIDE CONTROL OFFLINE LED CONTROLLER WITH ACTIVE PFC
PIN FUNCTIONS
Pin #
1
2
3
4
5
6
7
8
Name
MULT
ZCD
VCC
GATE
CS
GND
Pin Function
Multiplier input. Connect this pin to the tap of resistor divider from the rectified voltage of the
AC line. The half-wave sinusoid signal to this pin provides a reference signal for the internal
current control loop.
Zero-current detection. A negative going-edge triggers the turn-on signal of the external
MOSFET. Connect this pin to a resistor divider between the auxiliary winding to GND. Over-
voltage condition is detected through ZCD. Every switching turn-off interval, if ZCD voltage
is higher than the over-voltage-protection (OVP) threshold after the 1.5µs blanking time, the
over-voltage protection will trigger and the system will stop switching until auto-restart
comes. ZCD pin can also monitor over-current condition. Connect this pin thru a diode to a
resistor divider between CS to GND. Every switching turn-on interval, if ZCD voltage is
higher than the over-current-protection (OCP) threshold after the 280ns blanking time, the
over-current protection will trigger and the system will stop switching until auto-restart
comes.
Power supply input. This pin supplies the power for the control signal and the high-current
MOSFET grade drive output. Bypass this pin to ground with an external bulk capacitor of
typically 22µF in parallel with a 100pF ceramic cap to reduce noise.
Gate drive output. This totem pole output stage is able to drive a high-power MOSFET with
a peak current of 1A source capability and 1.2A sink capability. The high level voltage of
this pin is clamped to 13.5V to avoid excessive gate drive voltage. And the low level voltage
is higher than 6V to guarantee enough drive capacity.
Current sense. The MOSFET current is sensed via a sensing resistor to its source lead. The
comparison between the resulting voltage and the internal sinusoidal-current reference
signal determines when the MOSFET turns off. A feed-forward from the rectified AC line
voltage connected to the current sense pin maximizes the line regulation. If the pin voltage
is higher than the current limit threshold of 2.5V (after turn-on blanking) the gate drive will
turn off.
Ground. Current return for the control signal and the gate drive signal.
FB/NC Feedback signal. Leave this pin floating (NC) for primary-side control.
COMP
Loop compensation input. Connect a compensation network to stabilize the LED drive and
maintain an accurate LED current.
MP4021 Rev.1.11
11/23/2011
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2011 MPS. All Rights Reserved.
5

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MP4021 arduino
MP4021—PRIMARY SIDE CONTROL OFFLINE LED CONTROLLER WITH ACTIVE PFC
Output Over-Voltage Protection (OVP)
Output over voltage protection can prevent the
components from damage in the over voltage
condition. The positive plateau of auxiliary
winding voltage is proportional to the output
voltage, the OVP uses the auxiliary winding
voltage instead of directly monitoring the output
voltage, the OVP sample is shown in Figure 8.
Once the ZCD pin voltage is higher than 5.4V,
the OVP signal will be triggered and latched, the
gate driver will be turned off and the IC work at
quiescent mode, the VCC voltage dropped below
the UVLO which will make the IC shut down and
the system restarts again. The output OVP
setting point can be calculated as:
VOUT _ OVP
NAUX
NSEC
R
R
ZCD1
ZCD2
+ RZCD2
= 5.4V
VOUT_OVP—Output over voltage protection point
NAUX—The auxiliary winding turns
NSEC—The secondary winding turns
Auxiliary Winding
+
Vcc
Latch
OVP
signal
RZ C D1
ZCD
5.4V
RZ C D2
1.5µs
Blanking
CZ C D
Figure 8—OVP Sample Unit
To avoid the mis-trigger OVP by the oscillation
spike after the switch turns off, the OVP sampling
has a tLEB_OVP blanking period, typical 1.5µs,
shown in Figure 9.
VZCD
Sampling Here
0V
tLEB _OVP
Figure 9—ZCD Voltage and OVP Sample
Output Short Circuit Protection
The MP4021 clamps the CS pin voltage to less
than 2.5V to limit the available output power. If
the short circuit of the secondary-side occurs, the
voltage of the auxiliary winding will fall down
following the voltage of the secondary winding
and the VCC drops to less than UV threshold and
re-start the system.
As supplementary, tie a resistor divider form CS
sensing resistor to ZCD pin, shown in Figure 10.
When the power MOSFET in the primary-side is
turned on, the ZCD pin monitors the rising
primary-side current, once the ZCD pin reaches
OCP threshold, typical 0.6V, the gate driver will
be turned off to prevent the chip form damage
and the IC works at quiescent mode, the VCC
voltage dropped below the UVLO which will
make the IC shut down and the system restarts
again. Please note that the value of the resistors
to set the OCP threshold (ROCP1 & ROCP2) should
be much smaller than those of the ZCD zero-
current detector (RZCD1 & RZCD2)
VBUS
Primary Winding
Latch
GATE
PSR
control
CS
RCS
OCP
signal
ZCD
0.6V
D
280 ns
Blanking
ROCP1
ROCP2
Figure 10—OCP Sample Unit
MP4021 Rev.1.11
11/23/2011
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2011 MPS. All Rights Reserved.
11

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