MP4034 [MPS]

Offline LED Driver;
MP4034
型号: MP4034
厂家: MONOLITHIC POWER SYSTEMS    MONOLITHIC POWER SYSTEMS
描述:

Offline LED Driver

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中文:  中文翻译
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MP4034  
Offline LED Driver  
The Future of Analog IC Technology  
DESCRIPTION  
FEATURES  
The MP4034 is an offline regulator that  
provides accurate constant-current regulation.  
The LED driver circuit design is simplified by  
removing the opto-coupler and the secondary  
feedback components.  
Primary-Side–Control without Opto-coupler  
or Secondary Feedback Circuit  
Precise Constant Current Regulation  
Integrated 700V MOSFET with Minimal  
External Components  
Variable Off-Time and Peak-Current Control  
550µA High-Voltage Current Source  
Up to 7W Output Power  
Over-Voltage Protection  
Over-Temperature Protection  
Open-Loop Protection  
The MP4034 has an integrated 700V MOSFET.  
Its variable off-time control allows a flyback  
converter to operate in discontinuous  
conduction mode (DCM). The MP4034 also  
features complete protection functions such as  
VCC under-voltage lockout, over-voltage  
protection, over-temperature protection, and  
open-loop protection.  
Natural Spectrum Shaping for Improved  
EMI Signature  
Low Cost and Simple External circuit  
SOIC8-7A Package  
The MP4034's variable switching frequency  
provides natural spectrum shaping to smooth  
the EMI signature, which can reduce the EMI  
filter’s size and cost.  
APPLICATIONS  
Offline LED Driver  
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.  
TYPICAL APPLICATION  
L
N
MP4034 Rev. 1.02  
12/4/2013  
www.MonolithicPower.com  
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.  
© 2013 MPS. All Rights Reserved.  
1
MP4034 – OFFLINE LED DRIVER  
ORDERING INFORMATION  
Part Number*  
Package  
Top Marking  
MP4034GS  
SOIC8-7A  
MP4034  
* For Tape & Reel, add suffix –Z (e.g. MP4034GS–Z);  
PACKAGE REFERENCE  
TOP VIEW  
1
2
3
4
8
6
5
SOIC8-7A  
ABSOLUTE MAXIMUM RATINGS (1)  
Drain to GND ................................-0.7V to 700V  
VCC to GND ...................................-0.3V to 30V  
FB Input ..........................................-0.7V to 10V  
Thermal Resistance (4)  
SOIC8-7A ..............................76...... 45... °C/W  
θJA  
θJC  
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-to-  
ambient 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.  
(2)  
Continuous Power Dissipation (TA = +25°C)  
SOIC8-7A…………………………………...1.3W  
Junction Temperature...............................150°C  
Lead Temperature ....................................260°C  
Storage Temperature............... -60°C to +150°C  
ESD Capability Human Body Mode.......... 2.0kV  
ESD Capability Machine Mode .................. 200V  
3) The device is not guaranteed to function outside of its  
operating conditions.  
4) Measured on JESD51-7, 4-layer PCB.  
Recommended Operating Conditions (3)  
Operating VCC range ......................6.6V to 28V  
Operating Junction Temp. (TJ). -40°C to +125°C  
MP4034 Rev. 1.02  
12/4/2013  
www.MonolithicPower.com  
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.  
© 2013 MPS. All Rights Reserved.  
2
MP4034 – OFFLINE LED DRIVER  
ELECTRICAL CHARACTERISTICS  
VCC = 15V, TA = 25°C, unless otherwise noted.  
Parameter  
Symbol Condition  
Min  
Typ  
Max  
Units  
Supply Voltage Management (VCC Pin)  
VCC ON threshold  
VCCH  
VCCL  
16.8  
6
17.3  
6.3  
17.8  
6.6  
V
V
VCC OFF threshold  
VCC operating voltage  
Quiescent current  
6.6  
28  
V
IQ  
At no load condition, VCC=20V  
60kHz, VCC=20V  
360  
500  
0.1  
410  
μA  
μA  
µA  
Operating current  
IOP  
Leakage current from VCC Pin  
Internal MOSFET (Drain Pin)  
Break down voltage  
ILeak_VCC VCC=0VÆ16V, Drain float  
1
VBRDSS VCC=20V, VFB=7V  
ICharge VCC=4V, VDrain=100V  
700  
450  
V
Supply Current from Drain Pin  
550  
1
750  
10  
µA  
µA  
Leakage current from Drain Pin ILeak_Drain VDS=500VDC  
On-state resistance  
RON  
ID=10mA, TJ=20 degree  
VFB=-0.5V  
10  
13  
Internal Current Sense  
Current Limit  
ILimit  
tLEB  
365  
230  
380  
300  
395  
370  
mA  
ns  
Leading-edge blanking  
Feedback input (FB Pin)  
FB pin input current  
IFB  
VFB=4V  
0.2  
120  
-0.15  
4
0.5  
160  
-0.08  
4.07  
6.5  
μA  
mV  
V
DCM detect threshold  
FB open-circuit threshold  
First-level FB OVP threshold  
VDCM  
80  
-0.22  
3.93  
6.2  
VFBOPEN  
VFBOVP1  
V
Second-level FB OVP threshold VFBOVP2  
6.35  
V
OVP sampling delay  
tOVP  
3.5  
µs  
Thermal Shutdown  
Thermal shutdown threshold  
150  
120  
°C  
°C  
Thermal shutdown recovery  
threshold  
MP4034 Rev. 1.02  
www.MonolithicPower.com  
3
12/4/2013  
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.  
© 2013 MPS. All Rights Reserved.  
MP4034 – OFFLINE LED DRIVER  
TYPICAL CHARACTERISTICS  
Charge Current vs.  
Leakage Current vs.  
Junction Temperature  
Breakdown Voltage vs.  
Junction Temperature  
Junction Temperature  
850  
4.0  
700  
3.5  
800  
750  
700  
650  
600  
550  
500  
650  
3.0  
600  
550  
500  
450  
400  
2.5  
2.0  
1.5  
1.0  
0.5  
0.0  
-50 -25  
0
25 50 75 100 125  
-50 -25  
0
25 50 75 100 125  
-50 -25  
0
25 50 75 100 125  
V
ON Threshold vs.  
V
OFF Threshold vs.  
First-Level OVP Threshold  
vs. Junction Temperature  
CC  
Junction Temperature  
CC  
Junction Temperature  
18.0  
17.5  
17.0  
16.5  
16.0  
15.5  
15.0  
7.00  
6.75  
6.50  
6.25  
6.00  
5.75  
5.50  
5.25  
5.00  
4.100  
4.075  
4.050  
4.025  
4.000  
3.975  
3.950  
3.925  
3.900  
-50 -25  
0
25 50 75 100 125  
-50 -25  
0
25 50 75 100 125  
-50 -25  
0
25 50 75 100 125  
DCM Detect Threshold  
vs. Temperature Chart  
FB Open Circuit Threshold  
vs. Junction Temperature  
Second-Level OVP Threshold  
vs. Junction Temperature  
0.000  
-0.020  
-0.040  
-0.060  
-0.080  
-0.100  
-0.120  
-0.140  
-0.160  
-0.180  
-0.200  
7.000  
0.130  
0.125  
0.120  
0.115  
0.110  
0.105  
0.100  
6.750  
6.500  
6.250  
6.000  
5.750  
5.500  
5.250  
5.000  
-50 -25  
0
25 50 75 100 125  
-50 -25  
0
25 50 75 100 125  
-50 -25  
0
25 50 75 100 125  
MP4034 Rev. 1.02  
12/4/2013  
www.MonolithicPower.com  
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.  
© 2013 MPS. All Rights Reserved.  
4
MP4034 – OFFLINE LED DRIVER  
TYPICAL CHARACTERISTICS (continued)  
OVP Sample Delay vs.  
Junction Temperature  
On State Resistance vs.  
Junction Temperature  
Current I  
vs.  
Junction Temperature  
Limit  
400  
390  
380  
370  
20  
15  
10  
5.0  
4.5  
4.0  
3.5  
3.0  
2.5  
2.0  
5
0
360  
350  
-50 -25  
0
25 50 75 100 125  
-50 -25  
0
25 50 75 100 125  
-50 -25  
0
25 50 75 100 125  
MP4034 Rev. 1.02  
12/4/2013  
www.MonolithicPower.com  
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.  
© 2013 MPS. All Rights Reserved.  
5
MP4034 – OFFLINE LED DRIVER  
TYPICAL PERFORMANCE CHARACTERISTICS  
Performance waveforms are tested on the evaluation board of the Design Example section.  
VIN = 230VAC, VOUT = 40V, IOUT=0.13A, L = 1.2mH, TA = 25°C, unless otherwise noted.  
Input Power Startup  
OCkP Recovery  
SCP Entry  
Input Power Shut Down  
OCkP Entry  
V
V
V
DS  
DS  
DS  
100V/div.  
100V/div.  
100V/div.  
V
CC  
10V/div.  
I
OUT  
I
I
OUT  
OUT  
100mA/div.  
50mA/div.  
50mA/div.  
OVP Entry  
OVP Recovery  
V
V
DS  
DS  
V
DS  
100V/div.  
100V/div.  
100V/div.  
V
V
V
CC  
CC  
CC  
10V/div.  
10V/div.  
10V/div.  
I
I
I
OUT  
OUT  
OUT  
100mA/div.  
50mA/div.  
50mA/div.  
SCP Recovery  
Output Current Ripple  
V
V
DS  
DS  
100V/div.  
100V/div.  
I
OUT  
V
V
CC  
CC  
50mA/div.  
10V/div.  
10V/div.  
I
I
OUT  
OUT  
50mA/div.  
50mA/div.  
MP4034 Rev. 1.02  
12/4/2013  
www.MonolithicPower.com  
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© 2013 MPS. All Rights Reserved.  
6
MP4034 – OFFLINE LED DRIVER  
TYPICAL PERFORMANCE CHARACTERISTICS (continued)  
Performance waveforms are tested on the evaluation board of the Design Example section.  
VIN = 230VAC, VOUT = 40V, IOUT=0.13A, L = 1.2mH, TA = 25°C, unless otherwise noted.  
Normal Operation  
Output Current Regulation  
5
4
3
2
1
0
V
DS  
-1  
-2  
-3  
-4  
-5  
100V/div.  
V
CC  
10V/div.  
V
FB  
10V/div.  
I
OUT  
100mA/div.  
80 100120140160180200220240260  
INPUT VOLTAGE (V)  
MP4034 Rev. 1.02  
12/4/2013  
www.MonolithicPower.com  
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© 2013 MPS. All Rights Reserved.  
7
MP4034 – OFFLINE LED DRIVER  
PIN FUNCTIONS  
SOIC8-7A  
Name Description  
Pin #  
Supply. An internal high-voltage current source charges VCC voltage to VCCH to start the IC.  
VCC The internal high-voltage current source will also turn on when VCC falls below VCCL to  
charge VCC. Connect a 0.1µF ceramic decoupling capacitor as close as possible to this pin.  
1
Feedback. Controls the OVP function. If VFB=4.0V, the first-level OVP triggers and output  
FB voltage remains constant. If VFB=6.35V, the second-level OVP triggers, switch immediately  
shuts off, and IC restarts.  
3
2, 4, 5, 6 GND Ground.  
8
Drain Internal MOSFET Drain. Input for the startup high-voltage current source.  
MP4034 Rev. 1.02  
12/4/2013  
www.MonolithicPower.com  
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© 2013 MPS. All Rights Reserved.  
8
MP4034 – OFFLINE LED DRIVER  
FUNCTIONAL BLOCK DIAGRAM  
Figure 1: Functional Block Diagram  
MP4034 Rev. 1.02  
12/4/2013  
www.MonolithicPower.com  
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MP4034 – OFFLINE LED DRIVER  
OPERATION  
Transformer Design  
Figure 4: Isolated Flyback LED Driver  
Figure 2: Simplified Flyback Converter  
The MP4034 ensures that the circuit operates  
in discontinues conduction mode (DCM). When  
the IC internal MOSFET turns on, the current (iP)  
flowing through transformer’s primary-side  
winding (NP) increases linearly until it reaches  
its peak current limit (IPK)  
Startup  
Initially, the IC is self-supplying through the  
internal high-voltage current source, which is  
drawn from the Drain pin. The internal high-  
voltage current source will turn off for better  
efficiency when VCC reaches the VCC ON  
threshold. Then the transformer’s auxiliary  
winding takes over as the power source. When  
VCC falls below the VCC OFF threshold, the IC  
stops switching and the internal high-voltage  
current source turns on again. See Figure 3 for  
the start-up waveform.  
0
Vcc  
Regulation Occurs Here  
Auxiliary Winding Takes Charge  
Figure 5: Current Waveform  
V
17.3  
Assume switching frequency is fs, the power  
stored in the inductor is given by:  
6.3V  
1
P = LM ×IP2K × fS  
Drain  
2
Switching Pulses  
Then inductance of coupling inductor is then:  
2×PO  
LM =  
IP2K × fS × η  
High voltage  
current source  
Where PO is output power and η is the  
estimated efficiency.  
ON  
When MP4034’s internal switch turns off, the  
freewheeling current (iS) will flow through  
secondary-side diode and decrease linearly, as  
shown in Figure 5.  
OFF  
Figure 3: VCC UVLO  
MP4034 Rev. 1.02  
12/4/2013  
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10  
MP4034 – OFFLINE LED DRIVER  
The relationship of peak current at ON period  
and OFF period is:  
This provides enough information to design the  
transformer turn ratio.  
Leading-Edge Blanking  
NP  
IPK _S  
=
×IPK  
Turning the power switch on induces a spike on  
the sense resistor. To avoid falsely terminating  
the switching pulse, the MP4034 includes a  
300ns leading-edge blanking period. During this  
blanking period, the current sense comparator  
is disabled and the gate driver can not switch  
off.  
NS  
Where NP is the number of primary winding  
turns, and NS is the number of secondary  
winding turns.  
The MP4034 detects the secondary side diode  
duty cycle by sampling the auxiliary winding  
voltage and generates a ZCD signal as shown  
in Figure 6.  
DCM Detection  
The MP4034 is designed to operate in  
discontinuous conduction mode (DCM). To  
avoid operating in continuous conduction mode  
(CCM), the MP4034 detects the falling edge of  
the FB input voltage with each cycle. If the chip  
does not detect a 120mV falling edge, it will  
stop switching.  
Over Voltage Protection  
The MP4034 has two levels of over-voltage  
protection based on the FB voltage.  
Figure 6: VFB and ZCD Waveforms  
In normal operation, MP4034 samples the FB  
pin voltage 3.5μs after the primary switch turns  
off, as shown in Figure 6.  
When the FB voltage is high—which means  
that the current is flowing through secondary-  
side diode—the ZCD signal goes high.  
Conversely, when the FB voltage is low—which  
means no current flows through the secondary-  
side diode—the ZCD signal goes low, meaning  
the secondary-side diode duty cycle (DS) is:  
TS _ ON  
DS =  
TS _ ON + TS _ OFF  
Figure 7: Auxiliary Voltage Waveform  
Then the average output current is:  
1
The relationship of output voltage and VFB is :  
IOUT  
=
×IPK _ S ×DS  
2
NP _ AU  
NS  
RDOWN  
VFB  
=
×
×(VO + VD )  
TS _ ON  
1 NP  
×
RUP + RDOWN  
=
×IPK ×  
2 NS  
TS _ ON + TS _ OFF  
Where VD is the secondary-diode forward-drop  
voltage.  
The MP4034 keeps  
current is:  
at 0.4. Thus the output  
DS  
When the MP4034 detects that the FB voltage  
equals 4.0V, the first level OVP triggers. The  
switching frequency drops to maintain the  
output voltage at a constant value. If VFB  
voltage exceeds 6.35V for 3.5μs, it will shut  
down immediately and discharge the VCC  
1 NP  
1 NP  
IOUT  
=
×
×IPK ×DS =  
×
×IPK  
2 NS  
5 NS  
MP4034 Rev. 1.02  
12/4/2013  
www.MonolithicPower.com  
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© 2013 MPS. All Rights Reserved.  
11  
MP4034 – OFFLINE LED DRIVER  
voltage. When VCC drops to UVLO, the MP4034  
will restart.  
1
2
N-1  
N
Figure 8: LED String  
Assume the forward voltage of one LED is VF  
and the total number of LEDs on the string is N.  
So the output voltage can be calculated as  
N×VF. To ensure that OVP won’t trigger during  
normal operation; the VFB should not exceed  
VFBOVP1 (typical 4.0V). However, avoid a large  
output voltage when OVP occurs. So the  
voltage reflected on the FB pin should be:  
NP _ AU  
NS  
RDOWN  
VFB  
=
×
×(N× VF + VD ) = 0.85VFBOVP1  
RDOWN + RUP  
Open-Circuit Protection (OCkP)  
The MP4034 has open-circuit protection  
(OCkP). If the 0.15V falling edge of VFB can  
not be monitored—which means the feedback  
loop is open—the MP4034 immediately shuts  
off the driving signals and enters hiccup mode.  
The MP4034 resumes normal operation when  
the fault has been removed.  
Thermal Shutdown (TSD)  
When the temperature of the IC exceeds 150°C,  
the over-temperature protection is enacted and  
the IC enters auto-recovery mode. When the  
temperature falls below 120°C, the IC resumes  
working.  
MP4034 Rev. 1.02  
12/4/2013  
www.MonolithicPower.com  
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© 2013 MPS. All Rights Reserved.  
12  
MP4034 – OFFLINE LED DRIVER  
APPLICATION INFORMATION  
If the VDC(min) can not satisfy this express,  
increase the value of the input capacitors to  
COMPONENT SELECTION  
Input Filter  
Input filter produces a DC source through the  
rectifier from the AC input power Figure 9 shows  
the input filter and Figure 10 shows the typical  
DC bus voltage waveform.  
increase the VDC(min)  
.
Output Diode  
Use a Schottky diode because of its fast  
switching speed and low forward voltage drop for  
better efficiency.  
If a lower average efficiency (3%-4%) is  
acceptable, replace the output diode with a PN-  
junction diode or other non-Schottky diode to  
lower costs.  
Leakage Inductance  
The transformer leakage inductance will  
decrease the system efficiency and affect the  
output  
current  
constant  
precision.  
The  
Figure 9: Input Filter  
transformer structure should be optimized to  
improve the primary side and secondary side  
coupling and minimize the transformer leakage  
inductance of transformer. Aim for a leakage  
inductance that is less than 5% inductance.  
RCD Snubber  
The transformer leakage inductance causes the  
MOSFET drain voltage spike and the excessive  
ringing on the drain voltage waveform.  
The RCD snubber circuit can limit this Drain  
voltage spike. Figure 11 shows the RCD snubber  
circuit.  
Figure 10: DC Input-Voltage Waveform  
Bulk capacitors C1 and C2 filter the rectified AC.  
Inductor L forms a π filter with C1 and C2 to  
restrain the differential-mode EMI noise. The  
resistor (R) in parallel with the inductor (L)  
restrains the mid-frequency-band EMI noise.  
Normally, R is selected between 1kand 10k.  
The DC input capacitors, C1 and C2, are usually  
2µF/W to 3µF/W for the universal input condition.  
For a 230VAC single-range application, the  
capacitor can be half that value. Normally, the  
minimum DC voltage should not be too low to  
ensure the converter can supply the maximum  
power to the load which can be express as  
follows:  
Figure 11: RCD Snubber  
NP  
NS  
DS  
VDC(min)  
(NVF + VD )⋅  
1DS  
MP4034 Rev. 1.02  
12/4/2013  
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13  
MP4034 – OFFLINE LED DRIVER  
Select RSN and CSN for an acceptable voltage  
spike and better system operation.  
The power dissipated in the snubber circuit is  
approximately:  
VSN  
1
2
PSN = LK IPK  
× fS  
2
VSN NPS × VO  
Where:  
LK is the leakage inductance,  
SN is the clamp voltage,  
V
Figure 12: FB Pin in Series with ON Resistor  
NPS is the turn ratio of primary and secondary  
side.  
Dummy Load  
A dummy load is required in open-output  
applications for good over-voltage protection.  
Use a dummy load of ~10mW for good load  
regulation.  
The power consumed in the snubber resistor  
(RSN), the resistor (RSN) is:  
2
VSN  
RSN  
=
Maximum Switching Frequency  
Because of the parameter tolerance of the  
sampling detecting time and inductance  
PSN  
The maximum ripple of the snubber capacitor  
voltage is:  
tolerances, select  
a
secondary-side-diode  
conduction time that exceeds 5.4µs as follows.  
VSN  
ΔVSN =  
NS LM  
NP (VO + VD )  
CSN RSN fS  
TS _ ON = IPK ⋅  
> 5.4μs  
Generally, a 15% ripple is reasonable. Use the  
previous equation to approximate CSN.  
For high or low temperature operation, select a  
maximum switching frequency below 75kHz.  
The damping resistor (R) in series with the RCD  
has a relatively large value to prevent any  
excessive ringing voltage that can affect the EMI.  
Use a damping resistor of about 200to 500to  
limit the drain voltage ringing.  
Resistor Divider  
For better application performance, use a resistor  
divider with values in the range of 10kto 100kΩ  
to limit noise from adjacent components on the  
FB pin. Connect a resistor with a value ranging  
from 1kto 2kfrom the FB pin to the resistor  
divider to limit substrate injection current effects,  
as shown in Figure 12.  
MP4034 Rev. 1.02  
12/4/2013  
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14  
MP4034 – OFFLINE LED DRIVER  
PCB Layout Guide  
PCB layout is very important to achieve reliable  
operation, and good EMI and thermal  
performance. The use design guide as follows  
to help optimize performance.  
1. Minimize the loop area formed by the input  
capacitor, the MP4034 drain-source, and the  
primary winding to reduce EMI noise.  
2. The copper area connected to source pins  
acts as a heat sink. Provide a large copper area  
to improve the thermal performance.  
3. Minimize the clamp circuit loop to reduce EMI.  
Bottom Layer  
4. Minimize the secondary loop area of the  
output diode and output filter to reduce the EMI  
noise. In addition, provide a sufficient copper  
area at the anode and cathode terminal of the  
output diode for heat dissipation.  
Figure 13: PCB Layout  
Design Example  
Below are design examples following the  
application  
guidelines  
for  
the  
given  
specifications:  
5. Place the AC input away from the switching  
nodes to minimize the noise coupling that may  
bypass the input filter.  
Table 1: Design Example  
Example 1  
VIN  
VOUT  
IOUT  
85VAC-265VAC  
6. Place the bypass capacitor as close as  
possible to the IC and source.  
40V  
0.13A  
7. Place the feedback resistors at the FB pin  
and minimize the feedback sampling loop area  
to minimize noise coupling.  
Example 2  
VIN  
VOUT  
IOUT  
85VAC-265VAC  
10V  
8. Use a single point connection at the negative  
terminal of the input filter capacitor for the  
MP4034 source pin and bias winding return.  
0.35A  
Figure 14 and Figure 15 show the detailed  
isolated application, while Figure 16 and Figure  
17 show the detailed non-isolated application.  
These examples were used in the Typical  
Performance Characteristics section. For more  
applications, please refer to the related  
evaluation board datasheets.  
Figure 13 shows a layout example.  
Top Layer  
MP4034 Rev. 1.02  
12/4/2013  
www.MonolithicPower.com  
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.  
© 2013 MPS. All Rights Reserved.  
15  
MP4034 – OFFLINE LED DRIVER  
TYPICAL APPLICATION CIRCUITS  
Figure 14: Typical Application Example  
Universal Input, Driving 14 LEDs in Series, 130mA LED Current, 6W Isolation Flyback Converter  
L1 1mH/0.1A  
T1  
1
R1 10k/0805  
R2  
499k  
1206  
C3  
D3  
NP  
ES1D/200V/1A  
2.2nF/630V  
1206  
6
LED+  
10V/0.35A  
LED-  
FR110/1W  
2
3
L
R7  
10k  
C5  
22uF/16V  
1206  
BD1  
MB6S  
600V/0.5A  
C2  
2.2uF/400V  
C1  
D1  
NS  
4.7uF/400V  
85VAC~265VAC  
N
5
R3  
PGND  
NP_AU  
510  
0805  
EE13  
AGND  
Lp=1.1mH  
NP:NP_AU:NS=95:23:19  
4
PGND  
D2  
BAV21W  
200V/0.2A  
CY1  
1nF/4kV  
U1  
R4  
R6  
20/0805  
5
6
4
3
2
1
GND  
GND  
FB  
32.4k/1%  
PGND  
AGND  
GND  
R5  
GND  
VCC  
13.3k/1%  
PGND  
8
Drain  
C4  
MP4034/SOIC8-7A  
4.7uF/50V  
1206  
PGND  
Figure 15: Typical Application Example  
Universal Input, Driving 3 LEDs in Series, 350mA LED Current, 3.5W Isolation Flyback Converter  
MP4034 Rev. 1.02  
12/4/2013  
www.MonolithicPower.com  
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.  
© 2013 MPS. All Rights Reserved.  
16  
MP4034 – OFFLINE LED DRIVER  
Figure 16: Typical Application Example  
Universal Input, Driving 14 LEDs in Series, 150mA LED Current, 6W Non-isolated Buck-Boost Converter  
Figure 17: Typical Application Example  
Universal Input, Driving 3 LEDs in Series, 350mA LED Current, 3.5W Non-isolated Buck-Boost Converter  
MP4034 Rev. 1.02  
12/4/2013  
www.MonolithicPower.com  
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.  
© 2013 MPS. All Rights Reserved.  
17  
MP4034 – OFFLINE LED DRIVER  
FLOW CHART  
Start  
Y
V
CCL  
VCC  
<
Monitor V  
CC  
N
N
Monitor V CC  
VCC  
>
VCCH  
Y
N
Monitor V  
FB  
N
CC Operation  
VFB >-0.15V  
for entire  
cycle  
VFB>4.0V  
Y
Y
OCkP  
Operation  
First Level OVP  
CV Operation  
N
VFB>6.35V  
Y
Shut Off  
Switching  
Pulse  
Discharge  
Vcc to OFF  
threshold  
MP4034 Rev. 1.02  
www.MonolithicPower.com  
18  
12/4/2013  
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.  
© 2013 MPS. All Rights Reserved.  
MP4034 – OFFLINE LED DRIVER  
PACKAGE INFORMATION  
SOIC8-7A  
0.189(4.80)  
0.197(5.00)  
0.050(1.27)  
0.024(0.61)  
8
5
0.063(1.60)  
0.150(3.80)  
0.157(4.00)  
0.228(5.80)  
0.244(6.20)  
0.213(5.40)  
PIN 1 ID  
1
4
TOP VIEW  
RECOMMENDED LAND PATTERN  
0.053(1.35)  
0.069(1.75)  
0.0075(0.19)  
0.0098(0.25)  
SEATING PLANE  
0.004(0.10)  
0.010(0.25)  
0.013(0.33)  
0.020(0.51)  
SEE DETAIL "A"  
SIDE VIEW  
0.050(1.27)  
BSC  
FRONT VIEW  
0.010(0.25)  
0.020(0.50)  
x 45o  
NOTE:  
1) CONTROL DIMENSION IS IN INCHES. DIMENSION IN  
BRACKET IS IN MILLIMETERS.  
GAUGE PLANE  
0.010(0.25) BSC  
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)  
0.016(0.41)  
0.050(1.27)  
0o-8o  
SHALL BE0.004" INCHES MAX.  
5) JEDEC REFERENCE ISMS-012.  
6) DRAWING IS NOT TO SCALE.  
DETAIL "A"  
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.  
MP4034 Rev. 1.02  
12/4/2013  
www.MonolithicPower.com  
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.  
© 2013 MPS. All Rights Reserved.  
19  

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