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PDF ( 数据手册 , 数据表 ) MP4032-1

零件编号 MP4032-1
描述 Offline LED Driver
制造商 MPS
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MP4032-1 数据手册, 描述, 功能
MP4032-1
Primary-Side-Controlled, Offline LED Driver
with Fully-Integrated Internal MOSFET
The Future of Analog IC Technology
DESCRIPTION
The MP4032-1 is a TRIAC-dimmable, primary-
side-controlled, offline, LED lighting driver with
an integrated 500V MOSFET. It can achieve a
high power factor and accurate LED current
control for lighting applications in a single-stage
converter. The proprietary real-current control
can accurately control the secondary-side LED
current using primary-side information. It
simplifies LED lighting systems and increases
efficiency by removing the secondary feedback
components and the current-sensing resistor.
The MP4032-1 has a power-factor-correction
function and works in boundary-conduction
mode that reduces power losses. The DRAIN
pin can supply current to the internal charging
circuit for start-up without a perceptible delay.
The proprietary dimming control extends the
TRIAC-based dimming range.
The multiple protections greatly enhance
system reliability and safety. These protections
include VCC under-voltage lockout, LED over-
voltage and over-current protections, short-
circuit protection, and over-temperature
protection.
The MP4032-1 is available in an SOIC8-7A
package.
FEATURES
Real Current Control without Secondary
Feedback Circuit
Internal MOSFET with 500V High Voltage
Rating
Less than 6W Output Power
Internal Charging Circuit for Fast Start-Up
Accurate Line Regulation
Flicker-Free, Phase-Controlled TRIAC
Dimming with Extended Dimming Range
High Power Factor
Boundary-Conduction Mode
VCC UVLO
Cycle-by-Cycle Current Limiting
Over-Voltage Protection
Short-Circuit Protection
Over-Temperature Protection
Available in SOIC8-7A 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 MP4032-1 is patent pending.
Warning: Although this board is designed to satisfy safety
requirements, the engineering prototype has not been agency
approved. Therefore, all testing should be performed using an
isolation transformer to provide the AC input to the prototype
board.
MP4032-1 Rev. 1.02
www.MonolithicPower.com
7/15/2013
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2013 MPS. All Rights Reserved.
1







MP4032-1 pdf, 数据表
MP4032-1—PRIMARY-SIDE-CONTROLLED, OFFLINE LED DRIVER WITH FULLY-INTEGRATED MOSFET
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
VIN=120VAC, IO=350mA, VO=18V, 6LEDs in series, Lm=2.6mH, Np:Ns:Naux=96:16:20, TRIAC
dimmable, without ripple suppressor.
Steady State
Steady State
Steady State
ILED
200mA/div.
VCOMP
1V/div.
VCC
1V0DVR/dAiIvN.
200V/div.
VDRAIN
200V/div.
VZCD
2V/div.
VCS
1V/div.
VIN
200V/div.
IIN
100mA/div.
VDRAIN
200V/div.
VCOMP
2V/div.
VCC
10V/div.
ILED
200mA/div.
VCS
500mV/div.
VCOMP
2V/div.
VCC
10V/div.
ILED
200mA/div.
VDRAIN
200V/div.
VCOMP
2V/div.
VCC
10V/div.
VZCD
2V/div.
VCOMP
1V/div.
ILED
100mVAM/UdiLvT.
1V/div.
IIN
200mA/div.
VCOMP
1V/div.
ILED
50mA/div.
VMULT
1V/div.
IIN
200mA/div.
VCOMP
1V/div.
ILED
10mA/div.
VMULT
1V/div.
IIN
200mA/div.
MP4032-1 Rev. 1.02
www.MonolithicPower.com
7/15/2013
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2013 MPS. All Rights Reserved.
8







MP4032-1 equivalent, schematic
MP4032-1—PRIMARY-SIDE-CONTROLLED, OFFLINE LED DRIVER WITH FULLY-INTEGRATED MOSFET
RIPPLE SUPPRESSOR
(Innovative Proprietary)
For dimming LED lighting application, a single
stage PFC converter needs large output
capacitor to reduce the ripple whose frequency is
double of the Grid. And in deep dimming situation,
the LED would have shimmer caused by the
dimming on duty which is not all the same in
every line cycle. What’s more, the Grid has noise
or inrush which would bring out shimmer even
flicker. Figure 9 shows a ripple suppressor, which
can shrink the LED current ripple obviously.
DO
NS
RO + R
CO C +
DM
DZ
Figure9: Ripple Suppressor
Principle
Shown in Figure 9, Resister R, capacitor C, and
MOSFET M compose the ripple suppressor.
Through the RC filter, C gets the mean value of
the output voltage VCo to drive the MOSFET M. M
works in variable resistance area. C’s voltage VC
is steady makes the LEDs voltage is steady, so
the LEDs current will be smooth. MOSFET M
holds the ripple voltage vCo of the output.
Diode D and Zener diode DZ are used to restrain
the overshoot at start-up. In the start-up process,
through D and DZ, C is charged up quickly to turn
on M, so the LED current can be built quickly.
When VC rising up to about the steady value, D
and DZ turn off, and C combines R as the filter to
get the mean voltage drop of VCo.
The most important parameter of MOSFET M is
the threshold voltage Vth which decides the
power loss of the ripple suppressor. Lower Vth is
better if the MOSFET can work in variable
resistance area. The BV of the MOSFET can be
selected as double as VCo and the Continues
Drain current level can be selected as decuple as
the LEDs’ current at least.
About the RC filter, it can be selected by
τRC 50 / fLineCycle . Diode D can select 1N4148,
and the Zener voltage of DZ is as small as
possible when guarantee VD + VDZ > 0.5 VCO_PP .
Optional Protection Circuit
In large output voltage or large LEDs current
application, MOSFET M may be destroyed by
over-voltage or over-current when LED+ shorted
to LED- at working.
Gate-Source(GS) Over-voltage Protection
DO
NS
DM
RO + R
DZ RG
CO
C+
DG
Figure 10: Gate-Source OVP Circuit
Figure 10 shows GS over-voltage protection
circuit. Zener diode DG and resistor RG are used
to protect MOSFET M from GS over-voltage
damaged. When LED+ shorted to LED- at normal
operation, the voltage drop on capacitor C is high,
and the voltage drop on Gate-Source is the same
as capacitor C. The Zener diode DG limits the
voltage VGS and RG limits the charging current to
protect DG. RG also can limit the current of DZ at
the moment when LED+ shorted to LED-. VDG
should bigger than Vth.
Drain-Source Over-voltage and Over-current
Protection
As Figure 11 shows, NPN transistor T, resistor
RC and RE are set up to protect MOSFET M from
over-current damaged when output short occurs
at normal operation. When LED+ shorted to LED-,
the voltage vDS of MOSFET is equal to the vCo
which has a high surge caused by the parasitic
parameter. Zener Dioder DDS protects MOSFET
from over-voltage damaged. Transistor T is used
to pull down the VGS of M. When M turns off, the
load is opened, then the OVP mode is triggered,
MP4032-1 Rev. 1.02
www.MonolithicPower.com
7/15/2013
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2013 MPS. All Rights Reserved.
16










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