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PDF ( 数据手册 , 数据表 ) MP4032-2

零件编号 MP4032-2
描述 Offline LED Driver
制造商 MPS
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MP4032-2 数据手册, 描述, 功能
The Future of Analog IC Technology
MP4032-2
Offline LED Driver
with Fully-Integrated Internal MOSFET
DESCRIPTION
The MP4032-2 is a TRIAC-dimmable, offline
LED lighting driver with an integrated 600V
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 LED current.
The MP4032-2 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 MP4032-2 is available in an SOIC8-7A
package.
FEATURES
Internal MOSFET with 600V High Voltage
Rating
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 MP4032-2 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.
MP4032-2 Rev.1.01
www.MonolithicPower.com
10/23/2014
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2014 MPS. All Rights Reserved.
1







MP4032-2 pdf, 数据表
MP4032-2—OFFLINE LED DRIVER WITH FULLY-INTEGRATED INTERNAL MOSFET
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
VIN=230VAC/50Hz, 18 LEDs in series, ILED=98mA, VOUT=55V, Lm=1.45mH, TRIAC-dimmable, Non-
isolated Buck-boost Converter, without ripple suppressor, unless otherwise noted.
ILED
100mA/div.
VCOMP
1V/div.
VMULT
500mV/div.
VDRAIN
200V/div.
VIN
200V/div.
VCS
500mV/div.
VCC
5V/div.
VZCD
200mV/div.
VIN
200V/div.
IIN
100mA/div.
VMULT
1V/div.
VCOMP
1V/div.
VCC
5V/div.
ILED
50mA/div.
VCC
10V/div.
VZCD
2V/div.
VCOMP
1V/div.
ILED
100mA/div.
VOUT
20V/div.
ILED
100mA/div.
VCC
10V/div.
VZCD
2V/div.
VCOMP
1V/div.
ILED
100mA/div.
MP4032-2 Rev.1.01
www.MonolithicPower.com
10/23/2014
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2014 MPS. All Rights Reserved.
8







MP4032-2 equivalent, schematic
MP4032-2—OFFLINE LED DRIVER WITH FULLY-INTEGRATED INTERNAL MOSFET
MULT Pin Resistor Divider
The MULT pin resistor divider requires careful
tuning because the MULT voltage determines the
COMP voltage level, which directly influences the
dimming curve and performance. Test the
estimated divider values with different types of
TRIAC dimmers to determine precise resistor
values: typically use the divider for a COMP level
of 2.3V at 120VAC input.
Add a ceramic X7R capacitor to the MULT pin to
absorb the switching-frequency ripple on the
MULT voltage for accurate dimming-phase
detection. Increasing the capacitance can further
smooth the MULT voltage, but increase the input-
line voltage phase shift and diminish the power
factor. Typical values are between 2.2nF and
8.2nF.
VCC Power Supply
After the system starts up, the auxiliary winding
takes over the VCC power supply through a
rectifying diode with a relatively small current-
limiting resistor because of the limited power
dissipation. The bulk capacitor stabilizes the VCC
voltage to limit the ripple—most applications use
22μF. Use the following equation to determine
the voltage rating of the rectifying diode:
VD
VCCmax
Naux
NL
Vin _ max
Vaux _ negtive _ spike
Where VCCmax is the maximum VCC voltage,
typically 27V, Naux and NL are the auxiliary
winding and inductor winding turns, Vaux_negtive_spike
is the maximum negative spike on auxiliary
winding.
Layout Guide
PCB layout is very important to achieve reliable
operation, and good EMI and thermal
performance. Follow these guidelines to optimize
performance.
1) Design a short main-power path. Directly
connect the sense resistor GND return to the
input capacitor. Use the largest-possible
copper pour for the power devices for good
thermal performance.
2) Separate the power GND and the analog
GND, and connect them together only at an
IC GND pin.
3) Place the components as close as possible to
the corresponding IC pins. The ZCD pin
bypass capacitor and the COMP pin
capacitor have priority.
4) Separate the input high voltage wire from
other components and GND to avoid surge
failures. Select the pull-down resistors for the
BUS line to the active damping circuit and the
MULT pin for the DIP package.
5) Place the output rectifying diode as close as
possible to the output filter capacitor, and use
a short trace from the inductor output return
pin to the return point of the output filter
capacitor.
MP4032-2 Rev.1.01
www.MonolithicPower.com
10/23/2014
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2014 MPS. All Rights Reserved.
16










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