MP4012
High-Brightness, High-Current Accuracy
WLED Controller
The Future of Analog IC Technology
DESCRIPTION
FEATURES
The MP4012 is a current mode controller
designed for driving the high brightness Light
Emitting Diodes (LEDs) from extremely wide
input voltage 8V~55V. It can be used in Boost,
Buck, Buck-boost and SEPIC topologies.
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•
•
The MP4012 drives external MOSFET with
fixed frequency/constant off-time architecture to
regulate the LED current, which is measured
through an external current sense resistor. Its
feedback voltage can be adjusted by the
external DC bias voltage.
The MP4012 can work in constant frequency
operation mode or constant off time mode. It
features programmable slop compensation that
can optimize the control loop regulation and
avoid sub harmonic oscillation.
The MP4012 implements high frequency PWM
Dimming with external disconnect MOSFET. It
achieves analog dimming by adjusting the
feedback voltage.
The MP4012 has synchronizing function, which
makes multiple ICs synchronized to each other
by connecting SYNC pins together.
The MP4012 includes under-voltage lockout,
over voltage protection, open and short hiccup
mode protection, overload protection and
thermal protection to prevent damage in the
case of fault condition.
•
•
•
•
•
•
•
•
•
•
•
•
Constant-current WLED Controller
8V~55V Input Voltage
Constant Frequency Mode Or Constant Off
Time Mode
Programmable Switching Frequency or OffTime
Leading Edge Blanking for Current Sense
High Frequency PWM Dimming and Analog
Dimming
Output-to-Input Disconnect in Shutdown
Mode
Synchronization Function
Programmable Over Voltage Protection
Open Load Hiccup Mode Protection
Short Load Hiccup Mode Protection
Programmable Current Limit
UVLO, Thermal Shutdown
Soft Start
Available in 16-pin SOIC package
APPLICATIONS
•
•
•
•
•
LCD Backlighting Applications
DC/DC LED Controller Applications
General Illumination
Industrial Lighting
Automotive/ Decorative LED Lighting
All MPS parts are lead-free and adhere to the RoHS directive. For MPS green
status, please visit MPS website under Quality Assurance. “MPS” and “The
Future of Analog IC Technology” are Registered Trademarks of Monolithic
Power Systems, Inc.
The MP4012 is available in a 16-pin SOIC
package.
MP4012 Rev. 1.12
10/12/2013
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1
MP4012 ─ HIGH-VOLTAGE, HIGH-CURRENT ACCURACY WLED CONTROLLER
TYPICAL APPLICATION
L1
D1
VIN
C IN
R OVP1
M1
1
CDD
2
PWM DIM
13
SYNC
8
CCOMP
CREF
14
10
15
R SET2
GATE
VDD
CS
PWM
GND
SYNC
OVP
COMP
FAULT
REF
FB
ISET
SL
CL
RT
R OVP2
3
5
R SC
R CS
4
12
M2
11
16
RFB
6
R SET1
9
R CL1
MP4012 Rev. 1.12
10/12/2013
VIN
R CL2
COUT
RSL
7
RT
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2
MP4012 ─ HIGH-VOLTAGE, HIGH-CURRENT ACCURACY WLED CONTROLLER
ORDERING INFORMATION
Part Number*
MP4012DS
Package
SOIC16
Top Marking
MP4012
Free Air Temperature (TA)
-40°C to +85°C
*For Tape & Reel, add suffix –Z (e.g. MP4012DS–Z);
For RoHS, compliant packaging, add suffix –LF (e.g. MP4012DS–LF–Z).
PACKAGE REFERENCE
TOP VIEW
1
16
FB
VDD 2
15
ISET
VIN
GATE
3
14 COMP
GND
4
13
PWM
CS
5
12
OVP
SL
6
11
FAULT
RT
7
10
REF
SYNC
8
9
CL
ABSOLUTE MAXIMUM RATINGS (1)
VIN................................................ -0.5V to 60V
VDD................................................-0.5V to 13.5V
VGATE, VFAULT, VPWM, VRT ..........-0.5V to VDD+0.3V
All Other Pins ...............................-0.3V to 6.5V
Junction Temperature ...............................150°C
Lead Temperature ....................................260°C
(2)
Continuous Power Dissipation (TA = +25°C)
............................................................ 1.6 W
Recommended Operating Conditions
(3)
IN Supply Voltage VIN .........................8V to 55V
Operating Junction Temp. (TJ).-40°C to +125°C
MP4012 Rev. 1.12
10/12/2013
Thermal Resistance
(4)
θJA
θJC
SOIC16................................... 80 ...... 30... °C/W
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 PD (MAX) = (TJ
(MAX)-TA)/θJA. Exceeding the maximum allowable power
dissipation will cause excessive die temperature, and the
regulator will 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.
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3
MP4012 ─ HIGH-VOLTAGE, HIGH-CURRENT ACCURACY WLED CONTROLLER
ELECTRICAL CHARACTERISTICS
VIN =24V, TA = +25°C, unless otherwise noted.
Parameters
Symbol Condition
Operating Input Voltage
VDD Voltage
VIN
VVDD
Supply Current (Shutdown)
VDD Under Voltage Lockout
Under Voltage Lockout Hysteresis
VDD(external)
Internal Regulator
Reference Voltage
ISD
UVLO
Max Units
55
V
7.25
7.75
8.15
V
6.40
0.8
6.70
500
1.0
7.20
mA
V
mV
V
8
VIN ≥ 8V
VPWM = 0V
VDD Rising
VREF
VREFLINE
Reference Load Regulation
VREFLOAD
MP4012 Rev. 1.12
10/12/2013
Typ
Connect external DC voltage
Reference Line Regulation
PWM Dimming
PWM Low Threshold
PWM High Threshold
PWM Pull-down Resistance
Gate
GATE Short Circuit Current
GATE Sink Current
GATE Output Rise Time
GATE Output Fall Time
Current Sense
Leading Edge Blanking
Delay to Output of COMP Comparator
Delay to Output of CLIMIT Comparator
Comparator Offset Voltage
Oscillator
Oscillator Frequency
Oscillator Frequency
Maximum Duty Cycle
SYNC Input High
SYNC Input Low
SYNC Output Current
Slope Compensation
Current Source Out of SL Pin
Internal Current Mirror Ratio
Over Voltage Protection
OVP Threshold
OVP Threshold Hysteresis
Min
1.218 1.243 1.268
0.1μF bypassed capacitor,
IREF=0 VDD=7.25-12V
0.1μF bypassed capacitor,
IREF=0-500uA
VPWMI-LO VPMWI Falling
VPWMI-HI VPMWI Rising
RPWM
ISOURCE
ISINK
TRISE
TFALL
VGATE=0V, VDD=7.75V
VGATE=7.75V, VDD=7.75V
CGATE=1nF, VDD=7.75V
CGATE=1nF, VDD=7.75V
TBLANK
TDELAY1
TDELAY2
VOFFSET
fOSC1
fOSC2
DMAX
VSYNCH
VSYNCL
ISYNC
ISLOPE
GSLOPE
VOVP-TH
12
0
20
mV
0
13
mV
0.8
150
V
V
kΩ
85
45
A
A
ns
ns
250
200
200
25
ns
ns
ns
mV
650
130
95
kHz
kHz
%
V
V
μA
1.5
50
0.2
0.4
100
0.4
0.7
50
25
100
-25
RT=96kΩ
RT=500kΩ
510
100
90
1.5
580
115
92
0.8
16
ISLOPE=50μA, RSL=1kΩ
V
0
1.8
4.60
2.0
4.95
500
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95
2.2
μA
5.30
V
mV
4
MP4012 ─ HIGH-VOLTAGE, HIGH-CURRENT ACCURACY WLED CONTROLLER
ELECTRICAL CHARACTERISTICS (continued)
VIN =24V, TA = +25°C, unless otherwise noted.
Parameters
Output Short Circuit Protection
Gain for Short Circuit Comparator
Propagation time for short circuit
detection
Fault Output Rise Time
Fault Output Fall Time
Short Circuit Detecting Blanking Time
Current Source/Sink at COMP Pin for
Hiccup Mode Protection
Thermal Shutdown (5)
Symbol Condition
GSC
TOFF
TRISE
TFALL
TSC_BT
IHICCUP
Min
Typ
Max
1.8
2.0
2.2
ISET=200mV, FB=450mV,
FAULT goes form high to low
330pF capacitor at FAULT pin
330pF capacitor at FAULT pin
500
Units
250
ns
300
200
950
ns
ns
ns
5.0
μA
150
°C
Notes:
5) Guaranteed by design
MP4012 Rev. 1.12
10/12/2013
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5
MP4012 ─ HIGH-VOLTAGE, HIGH-CURRENT ACCURACY WLED CONTROLLER
TYPICAL PERFORMANCE CHARACTERISTICS
Performance waveforms are tested on the evaluation board of Typical Application Circuit
(Figure 5).
VIN = 64V, 12VIN=12V, ILED = 120mA, VLED=200V, 66WLEDs in series, TA = 25°C, Boost
Application, unless otherwise noted.
PWM Dimming Curve
Efficiency vs. VIN
140
97.00
120
96.00
100
95.00
80
94.00
60
93.00
40
92.00
20
91.00
0
0
0.2
0.4
0.6
PWM DUTY
0.8
90.00
50
1
Steady State
60
Soft Start
VDS
100V/div.
VDS
100V/div.
VCOMP
5V/div.
VCOMP
5V/div.
VPWM
5V/div.
VOUT
100V/div.
IL
500mA/div.
VOUT
100V/div.
ILED
100mA/div.
VOUT
100V/div.
ILED
100mA/div.
90
Short Load Recovery
VDS
100V/div.
VDS
100V/div.
VCOMP
5V/div.
VCOMP
5V/div.
VOUT
100V/div.
IL
500mA/div.
VOUT
100V/div.
ILED
100mA/div.
MP4012 Rev. 1.12
10/12/2013
80
PWM Dimming
VDS
100V/div.
OVP Recovery
70
VIN (V)
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6
MP4012 ─ HIGH-VOLTAGE, HIGH-CURRENT ACCURACY WLED CONTROLLER
PIN FUNCTIONS
Pin #
Name
1
VIN
2
VDD
3
4
GATE
GND
5
CS
6
SL
7
RT
8
SYNC
9
CL
10
REF
11
FAULT
12
OVP
13
PWM
14
COMP
15
ISET
16
FB
MP4012 Rev. 1.12
10/12/2013
Pin Function
Input Supply Pin. It is the input of internal linear regulator. Must be locally bypassed.
The Internal Linear Regulator Output Pin. VDD provides power supply for the external
MOSFET gate driver and the internal control circuitry. Bypass VDD to GND with a 0.47μF
or larger ceramic capacitor.
External MOSFET Gate Driver Pin.
Ground.
Switch Current Sense Input Pin. It is used to sense the current of the external power FET.
It has a built-in 100ns (min) blanking time.
Slope Compensation Pin for current sense. Connecting a resistor between SL and GND
programs the slope compensation. In case of constant off-time mode of operation, slope
compensation is unnecessary and let this pin open.
Switching frequency/off-time set Pin. A resistor connected between this pin and
GND/GATE sets the frequency/off-time.
Synchronization Pin. Connecting the multiple MP4012 SYNC pins together to achieve the
synchronous working mode.
Current Limit Set Pin. This pin sets the external MOSFET current limit. The current limit
can be set by using a resistor divider from the REF pin to GND.
Reference Output Pin. A 0.1μF or larger ceramic capacitor should be connected to bypass
this pin to GND.
Fault Indication Output Pin. This pin is pulled down to GND in case of short circuit
condition or over voltage condition. It is also used to drive the external MOSFET to
disconnect the load from Vin for boost converter.
Over Voltage Protection Input Pin. Connect a resistor divider from output to this pin to
program the OVP threshold. When the voltage of this pin reaches 4.95V, the MP4012
triggers over voltage protection.
PWM Dimming Input Pin. Apply a PWM signal on this pin for brightness control. The
GATE is disabled when PWM signal is low. The GATE is enabled when PWM signal is
high.
Converter Compensation Pin. This pin is used to compensate the regulation control loop.
Connect a capacitor or a series RC network from COMP to GND. COMP pin is also used
for hiccup timer. At IC start up, short protection or over voltage protection, the 5uA current
source charges COMP pint until 5V, and then the 5μA current source discharges COMP
voltage. IC is active when COMP voltage reduces to 1V.
LED Current Set Pin. Connect a resistor divider from REF pin to set the LED current
reference. The analog dimming function can be achieved through adjusting the voltage on
ISET pin.
Feedback Input Pin. Connect a current sense resistor from FB to GND. The MP4012
regulates the voltage across the current sense resistor. The regulation voltage is set by
ISET pin.
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7
MP4012 ─ HIGH-VOLTAGE, HIGH-CURRENT ACCURACY WLED CONTROLLER
OPERATION
The MP4012 drives external MOSFET with
current mode architecture to regulate the LED
current, which is measured through an external
current sense resistor. Figure 1 shows the
functional block diagram.
GATE pin sets the off time for CT mode. For
constant switching frequency mode, MP4012
includes a slope compensation section to ensure
the converter stability when duty cycle is greater
than 0.5.
MP4012 employs a special circuit for regulating
the internal power supply, which covers a wide
input voltage from 8V to 55V. The 7.75V linear
regulator provides all the power for internal
circuits and external MOSFET gate drive energy.
MP4012 has a 2% accurate 1.25V reference,
which is used as the reference for LED current.
The reference is also used to set the current limit
and over voltage threshold.
For synchronization, the SYNC pins of multiple
MP4012 can be connected together, and may
also be connected to the open drain output of a
master clock. When connected in this manner,
the oscillators will lock to the device with the
highest operating frequency.
MP4012 can be programmed as constant
switching frequency (CF) or constant off time (CT)
operation. Connecting a resistor between RT pin
and GND sets the switching frequency for CF
mode. Connecting a resistor between RT pin and
REF
MP4012 has two high-speed current comparators.
One is used during normal operation, which
contains an internal 100ns blanking time to
prevent the current spike from mis-triggering the
comparator. The other is used to limit the
maximum switch current, which is programmable
by connecting a resistor divider from REF pin.
BandGap
VIN
Linear Regulator
Thermal
POR
VDD
POR
POR
GATE
POR
CL
Reset
+
FAULT
R
CS
Slope
Compensation
Q
GND
+
LEB
S
SL
FB
EN
QN
R
Q
S
Hiccup Done
+
5V
OVP
+
PWM blank
-
ISET
SYNC
Hiccup Done
+
Oscillator
2
RT
POR
COMP
Reset
Hold
Hiccup
PWM
Hiccup Done
Hiccup Control
EN
100k
POR
Figure 1—Functional Block Diagram
MP4012 Rev. 1.12
10/12/2013
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8
MP4012 ─ HIGH-VOLTAGE, HIGH-CURRENT ACCURACY WLED CONTROLLER
Start up
The start up process is shown in Figure 2.
During start up, the COMP is charged to 5V first,
then it is discharged by an internal current source,
MP4012 is active until the COMP voltage is
discharged to 1V. The high level Fault turns on
the external disconnected MOSFET. The output
current is regulated by the converter.
VIN
VCC
5V
COMP
1V
Fault
t hiccup
Iout
Figure 2—Start up Process
Analog Dimming
Analog dimming can be accomplished by varying
the voltage at the ISET pin. This can be done
either by using resistor divider from the REF pin
or by applying an external DC voltage at the
ISET pin.
PWM Dimming
PWM dimming can be achieved by applying a
square wave signal on PWM pin. The PWM
signal controls the internal error amplifier (EA),
FAULT output and GATE output. When the PWM
signal is high, the GATE and FAULT pins are
enabled, and the output of the EA is connected to
the external compensation network. So the LED
current is regulated accurately. When the PWM
signal goes low, the GATE signal is disable. And
the FAULT pin is pulled down to GND to turn off
the disconnecting MOSFET. Meanwhile the
output of the EA is disconnected from the
compensation network. Thus, the COMP voltage
MP4012 Rev. 1.12
10/12/2013
can be hold by external capacitor. And the
disconnecting MOSFET can prevent the output
voltage from being discharged, which helps to
achieve the high frequency PWM dimming with
better linear dimming performance.
Protection
MP4012 includes short circuit protection and over
voltage protection, If the fault conditions are
detected (either short circuit or open circuit), the
COMP pin is disconnected from the internal EA
and the Gate and Fault pins are pulled down to
disable the LED controller, once the fault is
remove, the COMP pin is charged by an internal
current source until it reaches 5V, then the
COMP is discharged by an internal current
source. When it reaches 1V, the current source is
disconnected from COMP pin and the internal EA
is connected to it, the Fault pin starts to go high
and the Gate pin is allowed to switch.
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9
MP4012 ─ HIGH-VOLTAGE, HIGH-CURRENT ACCURACY WLED CONTROLLER
The short circuit threshold current is internally set
to 200% of the steady state current. When the
output current becomes higher than the short
circuit threshold after some delay, the short
circuit protection circuit is activated. See Figure
3. This allows the LED drive system auto-restart
in an accident short condition without having to
reset the IC.
The open load protection is achieved through
detecting the OVP pin voltage. When open load
fault occurs, the output voltage rises as the
output capacitor is still charged. The over voltage
protection turns off the MP4012 and takes
FAULT to GND when the OVP pin exceeds
4.95V. The converter turns on when the output
voltage falls below the falling OVP threshold after
a hiccup mode delay timer. MP4012 will repeat
the process until the open load fault is removed.
When recovering from the open load condition,
the output current might have some spike which
caused by the high output voltage, and trigger
the short load protection. But it can enter normal
work mode when output voltage is close to the
normal value. See Figure 4.
Short Load
Short Load
Recover
Output
Current
Normal Current
5V
COMP
1V
Hiccup Time
Fault
Figure 3 — Hiccup Mode Short Load
Protection
Open Load
Open Load
Recover
OVP-H
OVP-L
Output
Voltage
Vout-normal
5V
COMP
1V
thiccup1
Output
Current
Fault
thiccup2
Normal Current
t delay
Figure 4 — Open Load Protections
MP4012 Rev. 1.12
10/12/2013
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10
MP4012 ─ HIGH-VOLTAGE, HIGH-CURRENT ACCURACY WLED CONTROLLER
APPLICATION INFORMATION
Switching Frequency Set
An external resistor RT on RT pin can be used to
set the switching frequency through the following
equation:
fS =
55.6 × 109
RT
LED Current Set
Choose an external current sense resistor (RFB)
to set the LED current.
RFB =
VISET
ILED
Here, VISET is LED current reference on ISET pin,
which is set by a resistor divider from REF pin to
GND. It is recommended to add a 0.1uF ceramic
capacitor on ISET pin to avoid noise injection.
Over Voltage Protection Set
Choose a voltage divider (ROVP1, ROVP2 in typical
application) from the output to set the over
voltage protection threshold:
VOVP = 4.95V ×
ROVP1 + ROVP2
ROVP2
Slope Compensation
MP4012 employs peak current mode control
which need slope compensation to avoid subharmonic oscillation when duty cycle exceeds
50%. To ensure current loop stability, choosing a
slope compensation which is at least half of the
down slope of inductor current.
The slope compensation is set by two external
resistors RSL and RSC. The slope compensation
resistor can be calculated as:
RSC = RSL × RCS × SDOWN × TS × 105
SDOWN (A/μs) is the down slope of the inductor
current.
SDOWN =
VL
L
Where VL is the voltage across the inductor, and
L is the inductor value.
TS is the switching period, which is set by the
frequency set resistor RT.
MP4012 Rev. 1.12
10/12/2013
RCS is the current sense resistor which senses
the switch current. It is recommended that the
current sense resistor RCS can be chosen to
provide 200mV current sense signal (also need
to
take
the
power
consumption
into
consideration).
The RSL is the slope resistor on SL pin, its value
is limited by the maximum source current of SL
pin. The minimum value of RSL is 25kΩ. 25kΩ –
50kΩ of slope resistor value is recommended.
Current Limit
Current limit value can be set by a resistor divider
from REF pin to GND. The voltage of CL can be
set as:
VCL ≥ 1.2 × IPK × RCS +
4.5 × RSC
RSL
Here, IPK is peak current of inductor.
The VCL value should NOT be greater than
450mV, NO capacitor should be connected
between CL pin and GND.
Hiccup Timer
If the fault conditions are detected (either short
circuit or open circuit), the COMP pin is
disconnected from the internal EA and the Gate
and Fault pins are pulled down to disable the
LED controller. Once the fault condition is
cleared, the COMP pin is charged by an internal
5μA current source until it reaches 5V, then the
COMP is discharged by an internal 5μA current
source. When it reaches 1V, the current source is
disconnected from COMP pin and the internal EA
is reconnected to it, the Fault pin starts to go high
and the Gate pin is allowed to switch. The hiccup
timer can be programmed by R -C network (RZ,
CZ in series and parallel with CC) on COMP pin.
The delay time of Startup (Figure 2) can be
approximately calculated as:
thiccup ≈ (CC + CZ)
9V
5μA
In most case the voltage drop on RZ can be
neglected.
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11
MP4012 ─ HIGH-VOLTAGE, HIGH-CURRENT ACCURACY WLED CONTROLLER
The hiccup time of Over Current Protection (Figure
3) can be approximately calculated as:
thiccup ≈ (CC + CZ)
9V-VCOMP
5μA
Here, VCOMP is the voltage of COMP when fault
condition is detected.
The hiccup time of Over Voltage Protection (Figure
4) can be approximately calculated as:
tdelay ≈ 0.1× (ROVP1 + ROVP2) × CO
thiccup1 ≈ (CC + CZ)
9V-VCOMP
5μA
thiccup2 ≈ (CC + CZ)
MP4012 Rev. 1.12
10/12/2013
8V
5μA
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12
MP4012 ─ HIGH-VOLTAGE, HIGH-CURRENT ACCURACY WLED CONTROLLER
TYPICAL APPLIACTION CIRCUIT
LED+
L1
R3
C2
NC
US1G
U1
MP4012/SO16
CN1
1
C3
8
D1
7 VIN
C13
M1
VIN
FB
C11
C8
2
VDD
ISET
R10
C5
4
R1
3
2
1
PWM
A-DIM
SYNC
R2
20.5k
GATE
COMP
R12
14
GND
PWM
NC
R21
953k
M2
1k
R18
4.3k
3k
4
R6
1k
3
NC 20
C15
100nF
R14
15
6 12VIN
5
NC
R19
C7
NC
C14
220pF
16
REF
R13 9.09k
C10
C12
R17
R22
3.32
NC
R23
NC
R24
NC
NC
33nF
220pF
13
R4
C4
1nF
5
R5
CS
OVP
SL
FAULT
12
1.58k
C6 NC
R9 30k
6
7
RT
REF
11
10
R8
560k
R7 NC
R16
Fault
REF
REF
C1
LED-
D2
R20
21.5k
2k
C9
R11
8
SYNC
CL
9
21k
R15
10k
Figure 5—MP4012 Boost Application
MP4012 Rev. 1.12
10/12/2013
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2013 MPS. All Rights Reserved.
13
MP4012 ─ HIGH-VOLTAGE, HIGH-CURRENT ACCURACY WLED CONTROLLER
VIN
D1
L1
CIN
DC
Supply
1
2
PWM DIM
CCOMP
CREF
13 PWM
GND
14
10
15
RSET1
RCL1
GATE
CS
8
SYNC
VIN
VDD
CDD
RSET2
ROVP1
M1
VDD 12V
9
SYNC
COMP
OVP
FAULT
REF
FB
ISET
SL
CL
RT
C OUT
R OVP2
3
5
LED 1+
RSC
RCS
4
12
M2
11
LED 1-
16
RFB
6
RSL
7
RCL2
RT
LED 2+
VIN
VDD 12V
PWM DIM
Block 2
SYNC
LED 2LED n+
VIN
VDD 12V
PWM DIM
Block n
SYNC
LED n-
Figure 6—Typical Application Circuit for TV LED Backlighting
MP4012 Rev. 1.12
10/12/2013
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2013 MPS. All Rights Reserved.
14
MP4012 ─ HIGH-VOLTAGE, HIGH-CURRENT ACCURACY WLED CONTROLLER
VIN
L2
L1
CIN
D1
ROVP1
C1
1
2
CS
13 PWM
GND
8
SYNC
CCOMP
CREF
14
10
15
RSET2
RSET1
RCL1
GATE
VDD
CDD
PWM DIM
VIN
9
RCL2
SYNC
COMP
OVP
FAULT
REF
FB
ISET
SL
CL
RT
3
5
M1
COUT
R OVP2
RSC
RCS
4
12
M2
11
16
RFB
6
RSL
7
RT
Figure 7—MP4012 Sepic Application Circuit
MP4012 Rev. 1.12
10/12/2013
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2013 MPS. All Rights Reserved.
15
MP4012 ─ HIGH-VOLTAGE, HIGH-CURRENT ACCURACY WLED CONTROLLER
Rsense
RG2
MP8110DS RG1
COUT2
FB
6 RG2
RG1 3
8
VCC 7
2
5
OUT2
SHDN 1
NC
C VCC
GND 4
OUT1
L1
D1
VIN
C IN
1
CDD
2
PWM DIM
13
SYNC
8
CCOMP
CREF
14
10
15
R SET2
VIN
GATE
VDD
CS
PWM
GND
SYNC
OVP
COMP
REF
FAULT
FB
ISET
SL
CL
RT
5
R CL1
R CL2
COUT
R OVP2
3
R SC
R CS
4
12
11
FB
16
R FB
6
R SET1
9
R OVP1
M1
MP4012DS
R SL
7
RT
Figure8—MP4012 Buck-Boost Application Circuit
MP4012 Rev. 1.12
10/12/2013
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2013 MPS. All Rights Reserved.
16
MP4012 ─ HIGH-VOLTAGE, HIGH-CURRENT ACCURACY WLED CONTROLLER
PACKAGE INFORMATION
SOIC16
0.386( 9.80)
0.394(10.00)
0.024(0.61)
9
16
0.063
(1.60)
0.150
(3.80)
0.157
(4.00)
PIN 1 ID
0.050(1.27)
0.228
(5.80)
0.244
(6.20)
0.213
(5.40)
8
1
TOP VIEW
RECOMMENDED LAND PATTERN
0.053(1.35)
0.069(1.75)
SEATING PLANE
0.050(1.27)
BSC
0.013(0.33)
0.020(0.51)
0.004(0.10)
0.010(0.25)
SEE DETAIL "A"
SIDE VIEW
FRONT VIEW
0.010(0.25)
x 45o
0.020(0.50)
GAUGE PLANE
0.010(0.25) BSC
0o-8o
0.016(0.41)
0.050(1.27)
0.0075(0.19)
0.0098(0.25)
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 AC.
6) DRAWING IS NOT TO SCALE.
DETAIL "A"
NOTICE: The information in this document is subject to change without notice. Please contact MPS for current specifications.
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.
MP4012 Rev. 1.12
10/12/2013
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2013 MPS. All Rights Reserved.
17
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