19-6198; Rev 0; 2/12
MAX16841 Evaluation Kit
Evaluates: MAX16841
General Description
The MAX16841 evaluation kit (EV kit) demonstrates the
MAX16841 LED driver IC used for offline LED lighting
applications. The EV kit is configured as a flyback topology
to drive 6 to 8 LEDs from a universal AC input supply. The
IC is designed for standard offline applications. The typical
input power at 230V AC input is 11.7W.
The EV kit is designed to pass EM55015 Class B
specifications and EN6100-3-2 for harmonic currents.
The EV kit is dimmable with most of the leading- and
trailing-edge dimmers.
S
Universal AC Input Operation
S
Drives 6 to 8 Series LEDs
S
40V Open-LED Protection
S
Demonstrates IC Power-Factor Correction
S
Demonstrates Dimming with Leading- and
Trailing-Edge Dimmers
S
Passes EN55015 B Conducted EMI
S
Passes IEC 61000-3-2 Class D Harmonic Current
Emissions
S
Proven PCB Layout
Ordering Information
appears at end of data sheet.
Features
S
Fully Assembled and Tested
Component List
DESIGNATION
AC1, LED+
AC2, LED-
C1
QTY
2
2
1
DESCRIPTION
Red test points
White test points
0.022FF
Q10%,
630V film
capacitor
Panasonic ECQE6223KF
47000pF
Q10%,
50V X7R
ceramic capacitor (0805)
Murata GRM21BR71H473K
0.1FF
Q10%,
400V film
capacitor
Panasonic ECQE4104KF
0.22FF
Q10%,
400V film
capacitor
Panasonic ECQE4224kF
0.01FF
Q10%,
25V X7R
ceramic capacitor (0603)
TDK C1608X7R1E103K
4.7FF
Q20%,
50V X7R
ceramic capacitor (1210)
TDK C3225X7R1H475M
1FF
Q10%,
50V X7R ceramic
capacitor (0805)
Murata GRM21BR71H105KA
470FF
Q20%,
35V electrolytic
capacitors (10mm x 16mm)
Rubycon 35ZLH470M10x16
C10
1
DESIGNATION
QTY
DESCRIPTION
2200pF
Q20%,
6.3kV ceramic
capacitor
Murata DECE33J222ZC4B
4.7FF
Q10%,
16V X7R
ceramic capacitor (0805)
Murata GRM21BR71C475K
10FF
Q20%,
25V X7R ceramic
capacitor (1210)
TDK C3225X7R1E106M
0.1FF
Q10%,
25V X7R
ceramic capacitor (0603)
Murata GRM188R71E104K
0.033FF
Q10%,
25V X7R
ceramic capacitor (0603)
TDK C1608X7R1E333K
1000pF
Q5%,
250V C0G
ceramic capacitor (0805)
TDK C2012C0G2E102J
Not installed, ceramic
capacitor (0603)
33pF
Q5%,
50V C0G ceramic
capacitor (0603)
TDK C1608C0G1H330J
22pF
Q5%,
50V C0G ceramic
capacitor (0603)
TDK C1608C0G1H220J
C11
1
C2
1
C12
1
C3
1
C13
1
C4
1
C14
1
C5
1
C15
1
C6
1
C16
0
C7
1
C17
1
C8, C9
2
C18
1
_________________________________________________________________
Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
MAX16841 Evaluation Kit
Evaluates: MAX16841
Component List (continued)
DESIGNATION
D1
QTY
1
DESCRIPTION
600V, 1A bridge rectifier
(DFS)
Vishay DF06S-E3/45
100V, 3A Schottky diode
(SMB)
Comchip CDBB3100-G
75V, 150mA diodes
(SOD323F)
Fairchild 1N4148WS
400V, 1A rectifier diodes
(SMA)
Comchip CGRA4004-G
150V, 3W zener diode (SMB)
ON Semi 1SMB5953BT3G
15V, 500mW zener diode
(SOD123)
Fairchild MMSZ5245B
4.8V, 150mW zener diode
(SOT523)
Diodes Inc. BZX84C5V1T
600V, 1A rectifier(SMB)
Vishay MURS160-E3/52T
250V AC, 1.25A fuse
Bel Fuse Inc RST 1.25
1000FH inductors
Coilcraft LPS6235-105ML
600V, 2.4A n-channel
MOSFET (DPAK)
STMicroelectronics
STD3NK60ZT4
400V n-channel MOSFETs
(SOT223)
Fairchild FQT1N60C
35V, 50mA npn dual
transistor (SOT363)
Central Semi CMKT5088
600V, 800mA thyristor
(SOT223)
ON Semi MCR08MT1G
3I
Q1%,
1/2W resistor (1206)
Susumu RL1632R-3R00-F
150I
Q5%,
3/4W resistor
(1812)
Panasonic-ECG ERJ-S12J151
DESIGNATION
R3, R4
R5
R6, R25
R7, R8
R9
R10, R11
QTY
2
1
2
2
1
2
DESCRIPTION
549kI
Q1%,
1/4W resistors
(1206)
100I
Q5%
resistor (0805)
1kI
Q5%,
1/2W resistors
(1210)
2.1kI
Q1%
resistors (0805)
75kI
Q1%,
1/2W resistor
(1210)
100kI
Q1%,
1/4W resistors
(1206)
33I
Q5%,
1/2W resistor
(1206)
Vishay
CRCW120633R0JNEAHP
1.24MI
Q1%
resistors (0603)
22I
Q5%
resistor (0805)
604kI
Q1%
resistors (1206)
73.2kI
Q1%,
1/4W resistor
(0603)
300I
Q5%,
1W resistor
Panasonic-ECG
ERG-1SJ301A
32.4kI
Q1%
resistor (0603)
20.5kI
Q1%
resistor (0603)
12.1kI
Q1%
resistors (0603)
68.1kI
Q1%
resistor (0805)
430V transient/surge
absorber
Panasonic ERZV10D431
0I
Q5%
resistor (0603)
332kI
Q1%,
1/4W resistors
(1206)
78.7kI
Q1%
resistor (0603)
22kI
Q5%
resistor (0603)
150kI
Q5%
resistor (0603)
350mA, 1.17:6.84:4.19:1
transformer
Würth 750815148
Dimmable offline LED lamps
controller (8 SO)
Maxim MAX16841ASA+
PCB: MAX16841
EVALUATION KIT
D2
1
D3, D7, D9, D12,
D13
5
D4, D6
2
R12
1
D5
1
R13
R14
R15, R16
R17
2
1
2
1
D8
1
D10
1
D11
F1
L1, L2, L3
1
1
3
R18
R19
R20
R21, R26
R22
R23
R24
R27, R28
R29
R30
R31
T1
1
1
1
2
1
1
1
2
1
1
1
1
N1
1
N2, N4
2
Q1
1
Q2
1
R1
1
U1
1
R2
1
—
1
_________________________________________________________________
Maxim Integrated Products
2
MAX16841 Evaluation Kit
Evaluates: MAX16841
Component Suppliers
SUPPLIER
Bel Fuse Inc.
Central Semiconductor Corp.
Coilcraft, Inc.
Diodes Incorporated
Fairchild Semiconductor
Murata Electronics North America, Inc.
ON Semiconductor
Panasonic Corp.
Rubycon Corp.
Susumu International USA
TDK Corp.
Vishay
Würth Electronik GmbH & Co. KG
PHONE
201-432-0463
631-435-1110
847-639-6400
805-446-4800
888-522-5372
770-436-1300
602-244-6600
800-344-2112
408-467-3864
208-328-0307
847-803-6100
402-563-6866
201-785-8800
www.belfuse.com
www.centralsemi.com
www.coilcraft.com
www.diodes.com
www.fairchildsemi.com
www.murata-northamerica.com
www.onsemi.com
www.panasonic.com
www.rubycon.com
www.susumu-usa.com
www.component.tdk.com
www.vishay.com
www.we-online.com
WEBSITE
Note:
Indicate you are using the MAX16841 when contacting these component suppliers.
Quick Start
• MAX16841 EV kit
• 85V to 264V AC source
• 6 to 8 series-connected LED strings rated no less than
500mA
• Current probe to measure the LED current (the LED
should be illuminated)
The EV kit is fully assembled and tested. Follow the steps
below to verify board operation.
Caution: Do not turn on
the power supply until all connections are completed.
1) Connect the AC source to the AC1 and AC2 test points.
2) Connect the LED string anode and cathode to the
LED+ and LED- test points, respectively.
3) Clip the current probe across the LED+ wire to
measure the LED current.
4) Enable the power supply.
5) Measure the LED current using the current probe.
Required Equipment
age current-mode control to control the duty cycle of the
external switching MOSFET (N1). The IC is available in an
8-pin SO package.
The EV kit circuit is configured in a flyback topology
and provides up to 10W of output power for a string of 8
series LEDs connected at the LED+ and LED- test points.
The converter switching frequency is set at 70kHz. The
EV kit circuit operates from an AC supply voltage of
90V
RMS
to 265V
RMS
. The EV kit is designed on a proven
2oz copper, two-layer small PCB footprint design. The EV
kit is optimized for operation in the 180V
RMS
to 265V
RMS
range.
The IC uses average current-mode control, with the
circuit configured such that the average current flowing
into the current-sense resistor (R1) on a cycle-by-cycle
(switching frequency) basis is set by the voltage on
the REFI pin. The average current per switching cycle
flowing into R1 is as follows:
V
- 0.1V
I
av
=
REFI
5
×
R1
where V
REFI
is in volts, R1 is in ohms, and I
av
is in amps.
Circuit components L1, L2, L3, and C1 provide EMI
filtering. During the turn-on instant of the triac dimmer,
there would be significant ringing due to high inrush
current to charge the input capacitor, C3. The ringing
can cause the line current to fall to zero and turn off
the dimmer. Components R2, R6, and C4 function as a
damper and help to limit the inrush current and ringing.
Resistor R2 is bypassed by Q1 after approximately 55Fs
of dimming instant, thereby reducing power dissipation
in R2 and improving efficiency. Diode D4 provides fast
discharge of C2 during off instant of the dimmer.
Procedures
Detailed Description of Hardware
The MAX16841 EV kit demonstrates the MAX16841 LED
driver IC. The device is an average current-mode- control
HB LED driver IC for buck and flyback topologies in offline
LED lamp applications. The IC uses a proprietary input
current-control scheme to achieve power-factor correc-
tion. The IC’s LED driver uses constant-frequency, aver-
_________________________________________________________________
Maxim Integrated Products
3
MAX16841 Evaluation Kit
Evaluates: MAX16841
Capacitor C3 provides a path for the input switching-
frequency currents for the flyback converter. Maximum
value of this capacitor is limited by the input power-factor
requirement. The greater the value of C3, the lower the
input power factor. Electrolytic capacitors C8 and C9
filter the double-line frequency ripple in the LED current.
During startup, bias for the IC comes from the linear
regulator circuit formed by N2, R10, R11, and D8. During
running condition, bias comes from the auxiliary winding
of the flyback transformer (T1).
Resistors R15, R16, and R17 program the switching
threshold of the flyback converter. The rising threshold
is set at 22V input voltage. When the line voltage is at
an instant below V
TH
falling threshold, DIMOUT drives
MOSFET N4 on and resistor R18 connects across the
diode-bridge positive and GND. This load ensures that
there is a closed-circuit path for the timing circuit of
the triac in the external dimmer. The flyback converter
starts switching again when the line voltage is at an
instant above the V
TH
rising threshold. At the same time,
DIMOUT goes low and the resistor is disconnected.
Diode D6 blocks capacitors C3 and C4 to discharge
through R18 during the off-time of dimming.
Circuit components R27, R28, R29, D13, R13, C6, Q1, R21,
and R26 are used to set the reference for the input current.
Transistor Q1 is a pair of matched transistors. The voltage
information on C6 is used to control the current in the cur-
rent-mirror circuit formed by R13, R21, R26, and Q1. The
current flowing into R13 is approximately proportional to
the voltage across C6 and gets reflected on collector Q1A
and sinks the same amount of current from collector Q1B
as that flows into R13. The IC has a 50FA current source
at the REFI pin. The current flowing into R19 sets the input
current or the average current flowing into R1. The circuit
tries to keep the input power over the line voltage almost
constant. Circuit components R30, C11, D10, D12, and
R31 affect the input current reference during dimming and
a wide dimming range is accomplished.
During an open-LED condition, the output voltage
increases and this increase in voltage is reflected
on the auxiliary winding side; therefore, the IC’s IN
voltage increases. Once IN voltage exceeds 22.5V (typ),
switching stops and the energy transfer from primary to
secondary side is stopped. Switching restarts wehn IN
goes below 22V (typ).
The EV kit was tested with 8 LEDs for dimmer compatibility.
Table 1 list the dimmers tested using the EV kit.
EV Kit Dimming Waveforms and
Performance Using 8 LEDs
Table 1. Recommended Dimmers Tested
on EV Kit
DIMMER
Busch-Jaeger 6513-102
Busch-Jaeger 9250
Busch-Jaeger GER 2247
Busch 2250
Busch 6519
Berker 2875
Berker 2874
Berker 2873
Merten 5724
Berker 2885
Berker 2875
Lutron GLS09-C02889
ABB STD50-3
Clipsal 32E450LM
Clipsal 32E450UDM
Clipsal 32E450TM
_________________________________________________________________
Maxim Integrated Products
4
MAX16841 Evaluation Kit
Evaluates: MAX16841
Figures 1–6 depict waveforms when the EV kit is powered at different input voltages with 8 LEDs connected at LED+
and LED-.
INPUT VOLTAGE
(100V/div)
N1 DRAIN VOLTAGE
(100V/div)
INPUT CURRENT
(100mA/div)
V
CS
(1V/div)
4ms
4µs
Figure 1. Input Voltage and Current at 90V Input
Figure 4. Switching Waveforms at 230V Input
INPUT VOLTAGE
(200V/div)
LED CURRENT
LED CURRENT
(200mA/div)
LED VOLTAGE
LED VOLTAGE
(5V/div)
INPUT CURRENT
(100mA/div)
WAVEFORM INTENSITY: 23%
4ms
4ms/div
Figure 2. Input Voltage and Current at 230V Input
Figure 5. LED Voltage and Current at 230V Input
INPUT VOLTAGE
(200V/div)
LED VOLTAGE
(10V/div)
INPUT CURRENT
(100mA/div)
INPUT CURRENT
(200mA/div)
4ms
20ms/div
Figure 3. Input Voltage and Current at 265V Input
Figure 6. LED Voltage and Input Current During Startup
_________________________________________________________________
Maxim Integrated Products
5
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