User's Guide
SNVA295C – January 2008 – Revised May 2013
AN-1736 LM3433 HB LED Driver Evaluation Kit
1
Introduction
The LM3433 is an adaptive constant on-time DC/DC buck constant current controller designed to drive a
high brightness LEDs (HB LED) at high forward currents. It is a true current source that provides a
constant current with constant ripple current regardless of the LED forward voltage drop. The board can
accept an input voltage ranging from -9V to -14V w.r.t. GND. The output configuration allows the anodes
of multiple LEDs to be tied directly to the ground referenced chassis for maximum heat sink efficacy when
a negative input voltage is used.
2
LM3433 Board Description
The evaluation board is designed to provide a constant current in the range of 2A to 9A. With some
modification the board is capable of up to 20A. The LM3433 requires two input voltages for operation. A
positive voltage with respect to GND is required for the bias and control circuitry and a negative voltage
with respect to GND is required for the main power input. This allows for the capability of using common
anode LEDs so that the anodes can be tied to the ground referenced chassis. The evaluation board only
requires one input voltage of -12V with respect to GND. The positive voltage is supplied by the LM5002
circuit. The LM5002 circuit also provides a UVLO function to remove the possibility of the LM3433 from
drawing high currents low input voltages during startup. Initially the output current is set at the minimum of
approximately 2A with the POT P1 fully counter-clockwise. To set the desired current level a short may be
connected between LED+ and LED-, then use a current probe and turn the POT clockwise until the
desired current is reached. A PWM dimming FET is included on-board for testing when the LED can be
connected directly next to the board. A shutdown post on J2, ENA, is included so that startup and
shutdown functions can be tested using an external voltage. Included in the kit is a load board the
emulates a high current LED and an LED adapter board used to place a dimming FET close to a remote
LED.
3
LED Adapter Board Description
The LED adapter board is designed to allow placement of a dimming FET as close to an LED as possible.
The high currents supplied by the LM3433 require that the FET be very close the LED to reduce the
inductance between the two current paths. Placing the FET far from the LED could result in high voltage
spikes due to the di/dt through the inductance between the FET and the LED. If the LED cannot be placed
directly next to the LM3433 evaluation board then remove the dimming FET(s) from the LM3433 board
(Q5 and Q6) and use this board. The LED adapter board connects to the LM3433 board with the supplied
26 pin ribbon cable.
4
Load Board Description
The load board is designed to emulate an LED load. This board provides the ability to test the LM3433
without the possibility of accidentally destroying high current LEDs. It connects to the LM3433 evaluation
board with the supplied 26 pin ribbon cable. The load board has an adjustable voltage controlled with the
POT R5 and it includes three small LEDs that light up when the forward voltage of each is reached. This
allows for adjusting the voltage to the level desired corresponding to a red, green, or blue LED. Test
points are included so that current can be measured across a low value resistor both before and after the
included dimming FET.
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1
Setting the LED Current
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These resistors can also be removed and replaced with a short loop of wire if using a current probe is
desired. If the PWM dimming function is used with the load board the dimming FET(s) (Q5 and Q6) should
be removed from the LM3433 evaluation board. The load board is designed for approximately 8A
maximum. It includes thermal protection and will shut down if it gets too hot. The thermal protection may
trip during normal testing especially if higher voltages are used. If the thermal protection trips let the board
cool down and then resume testing.
5
Setting the LED Current
The LM3433 evaluation board is designed so that the LED current can be set in multiple ways. There is a
shunt on J2 initially connecting the ADJ pin to the POT allowing the current to be adjusted using the POT
P1. This POT will apply a voltage to the ADJ pin between 0.3V and 1.5V w.r.t. GND to adjust the voltage
across the sense resistor (RSENSE) R15. The shunt may also be removed and an external voltage positive
w.r.t. GND can then be applied to the ADJ test point on the board. A 10mΩ resistor comes mounted on
the board so using the VSENSE vs. VADJ graph in the Typical Performance Characteristics section the current
can be set using Equation 1:
ILED = VSENSE/RSENSE
(1)
Alternatively the shunt can be removed and connect the ADJ test point can be connected to the VINX test
point to fix VSENSE at 60mV.
6
PWM Dimming
The LM3433 is capable if high speed PWM dimming in excess of 40kHz. Dimming is accomplished by
shorting across the LED with a FET. A dimming FET is included on the evaluation board for testing LEDs
placed close to the board and also on the load board and adapter board for remote loads. The FET on the
evaluation board should be removed if using dimming with the load board or adapter board.
To use the dimming function apply square wave to the PWM test point on the board that has a positive
voltage w.r.t. GND. When this pin is pulled high the dimming FET is enabled and the LED turns off. When
it is pulled low the dimming FET is turned off and the LED turns on. A scope plot of PWM dimming is
included in the Typical Performance Characteristics section showing 30kHz dimming at 50% duty cycle.
2
AN-1736 LM3433 HB LED Driver Evaluation Kit
SNVA295C – January 2008 – Revised May 2013
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Figure 1. LM3433 Evaluation Board Schematic
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Table 1. Bill of Materials (BOM) 1 (2A to 9A)
Qty
ID
Part Number
Type
Size
1
U1
LM3433
LED Driver
WQFN-24
TI
1
U2
LM5002
Boost Regulator
SOIC-8
TI
1
C1
C0805C331J5GACTU
Capacitor
0805
330pF, 50V
Kemet
1
C2
GRM31CR61C106KC3
1L
Capacitor
1206
10µF, 16V
Murata
Vendor
1
C3
16SA150M
Capacitor
MULTICAP
150µF, 16V
Sanyo
2
C4, C5
GRM32ER61C226KE2
0L
Capacitor
1210
22µF, 16V
Murata
1
C6
GRM32ER61C476ME1
5L
Capacitor
1210
47µF, 16V
Murata
1
C7
C0805C104J5RACTU
Capacitor
0805
0.1µF, 50V
Kemet
2
C8, C13
HMK212BJ103KG-T
Capacitor
0805
10nF, 100V
Taiyo Yuden
C9
OPEN
2
C10, C11
GRM21BR61C475KA
Capacitor
0805
4.7µF, 16V
Murata
1
C12
0805YD105KAT2A
Capacitor
0805
1µF, 16V
AVX
1
C14
B37941K9474K60
Capacitor
0805
0.47µF, 16V
EPCOS Inc .
1
C15
GRM21BF51E225ZA01
L
Capacitor
0805
2.2µF, 25V
Murata
C17
OPEN
1
C18
08055C104JAT2A
Capacitor
0805
0.1µF, 50V
AVX
2
D1, D2
MA2YD2600L
Diode
SOD-123
60V, 800mA
Panasonic
1
D3
MBRS240LT3
Diode
SMB
40V, 2A
ON
Semiconductor
0805
0805
D4
OPEN
J1, J2
OPEN
1
J9
TFML-110-02-S-D
Connector
1
L1
LPS3008-104ML
Inductor
3008
100µH, 150mA
Coilcraft
1
L2
GA3252-AL
Inductor
GA3252-AL
12µH, 14A
Coilcraft
L3, L5
OPEN
2
L4, L6
MPZ2012S300A
Ferrite Bead
0805
30Ω @ 100MHz
TDK
1
L7
MPZ2012S101A
Ferrite Bead
0805
100Ω @ 100MHz
TDK
1
P1
3352T-1-103LF
Potentiometer
BOURNS2
10kΩ
Bourns
1
P10
3429-6002
Connector
HDR13x2
13X2 Pin Header
3M
SMB
TFM-110-02-X-D-LC
Samtec
0805
Q1, Q3, Q5
OPEN
2
Q4, Q6
Si7386DP
FET
PowerPAK
30V, 9.5mΩ
VishaySiliconix
1
Q2
NTMFS4841NH
FET
PowerPAK
30V, 11mΩ
ON
Semiconductor
Dual PNP
SOT363_N
1
4
Parameters
PowerPAK
Q7
BC856S
Q8, Q9
OPEN
1
R1
ERJ-6ENF2942V
Resistor
0805
29.4kΩ
Panasonic
1
R2
ERJ-6ENF2491V
Resistor
0805
2.49kΩ
Panasonic
3
R3, R30, R31
ERJ-6ENF1002V
Resistor
0805
10kΩ
Panasonic
1
R4
ERJ-6GEYJ393V
Resistor
0805
39kΩ
Panasonic
1
R5
ERJ-6GEYJ101V
Resistor
0805
100Ω
Panasonic
2
R7, R14
ERJ-6GEY0R00V
Resistor
0805
0Ω
Panasonic
1
R8
ERJ-6ENF2002V
Resistor
0805
20kΩ
Panasonic
1
R10
ERJ-6ENF4991V
Resistor
0805
4.99kΩ
Panasonic
2
R11, R12
ERJ-6ENF6192V
Resistor
0805
61.9kΩ
Panasonic
1
R13
ERJ-6GEYJ103V
Resistor
0805
10kΩ
Panasonic
AN-1736 LM3433 HB LED Driver Evaluation Kit
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Table 1. Bill of Materials (BOM) 1 (2A to 9A) (continued)
Qty
ID
Part Number
Type
Size
Parameters
Vendor
1
R15
WSL2512R0100FEA
Resistor
CR6332-2512
0.01Ω
Vishay
R16, R18, R19
OPEN
3
R17, R20, R21
ERJ-6GEYJ2R7V
Resistor
0805
0805
2.7Ω
Panasonic
1
R22
ERJ-6GEYJ100V
Resistor
0805
10Ω
Panasonic
1
R25
ERJ-6ENF7502V
Resistor
0805
75kΩ
Panasonic
R26
OPEN
4
-12V, GND,
LED+, LED-
1502-2
Test Post
TP 1502
0.109"
Keystone
3
ADJ, PWM,
VINX
1593-2
Test Post
TP 1593
0.084"
Keystone
Parameters
Vendor
0805
Table 2. Bill of Materials (BOM) 2(4A to 20A)
Qty
ID
Part Number
Type
Size
1
U1
1
U2
LM3433
LED Driver
WQFN-24
LM5002
Boost Regulator
SOIC-8
1
C1
C0805C331J5GACTU
Capacitor
0805
330pF, 50V
Kemet
1
C2
GRM31CR61C106KC31L
Capacitor
1206
10µF, 16V
Murata
TI
TI
1
C3
16SA150M
Capacitor
MULTICAP
150µF, 16V
Sanyo
2
C4, C5
GRM32ER61C226KE20L
Capacitor
1210
22µF, 16V
Murata
1
C6
GRM32ER61C476ME15L
Capacitor
1210
47µF, 16V
Murata
1
C7
C0805C104J5RACTU
Capacitor
0805
0.1µF, 50V
Kemet
2
C8, C13
HMK212BJ103KG-T
Capacitor
0805
10nF, 100V
Taiyo Yuden
C9
OPEN
2
C10, C11
GRM21BR61C475KA
Capacitor
0805
4.7µF, 16V
Murata
1
C12
0805YD105KAT2A
Capacitor
0805
1µF, 16V
AVX
1
C14
B37941K9474K60
Capacitor
0805
0.47µF, 16V
EPCOS Inc .
1
C15
GRM21BF51E225ZA01L
Capacitor
0805
2.2µF, 25V
Murata
0805
C17
OPEN
1
C18
08055C104JAT2A
Capacitor
0805
0805
0.1µF, 50V
AVX
2
D1, D2
MA2YD2600L
Diode
SOD-123
60V, 800mA
Panasonic
1
D3
MBRS240LT3
Diode
SMB
40V, 2A
ON
Semiconductor
D4
OPEN
SMB
J1, J2
OPEN
1
J9
TFML-110-02-S-D
Connector
TFM-110-02-X-D-LC
1
L1
LPS3008-104ML
Inductor
3008
100µH, 150mA
Coilcraft
1
L2
GA3252-AL
Inductor
GA3252-AL
12µH, 14A
Coilcraft
4
L3, L4,
L5, L6
MPZ2012S300A
Ferrite Bead
0805
30Ω @ 100MHz
TDK
1
L7
MPZ2012S101A
Ferrite Bead
0805
100Ω @ 100MHz
TDK
1
P1
3352T-1-103LF
Potentiometer
BOURNS2
10kΩ
Bourns
1
P10
3429-6002
Connector
HDR13x2
13X2 Pin Header
3M
4
Q3, Q4,
Q5, Q6
Si7386DP
FET
PowerPAK
30V, 9.5mΩ
VishaySiliconix
2
Q1, Q2
NTMFS4841NH
FET
PowerPAK
30V, 11mΩ
ON
Semiconductor
1
Q7
BC856S
Dual PNP
SOT363_N
Phillips
1
Q8
ZXTN25040DFHTA
NPN
SOT-23B
Zetex Inc.
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Table 2. Bill of Materials (BOM) 2(4A to 20A) (continued)
6
Qty
ID
Part Number
Type
Size
1
Q9
ZXTP25040DFHTA
PNP
SOT-23B
Parameters
Vendor
1
R1
ERJ-6ENF2942V
Resistor
0805
29.4kΩ
Panasonic
1
R2
ERJ-6ENF2491V
Resistor
0805
2.49kΩ
Panasonic
3
R3, R30,
R31
ERJ-6ENF1002V
Resistor
0805
10kΩ
Panasonic
1
R4
ERJ-6GEYJ393V
Resistor
0805
39kΩ
Panasonic
1
R5
ERJ-6GEYJ101V
Resistor
0805
100Ω
Panasonic
R7
OPEN
2
R14
ERJ-6GEY0R00V
Resistor
0805
0Ω
Panasonic
1
R8
ERJ-6ENF2002V
Resistor
0805
20kΩ
Panasonic
1
R10
ERJ-6ENF4991V
Resistor
0805
4.99kΩ
Panasonic
2
R11, R12
ERJ-6ENF6192V
Resistor
0805
61.9kΩ
Panasonic
1
R13
ERJ-6GEYJ103V
Resistor
0805
10kΩ
Panasonic
1
R15
WSL25125L000FEA
Resistor
CR6332-2512
0.005Ω
Vishay
6
R16, R17,
R18, R19,
R20, R21
ERJ-6GEYJ2R7V
Resistor
0805
2.7Ω
Panasonic
1
R22
ERJ-6GEYJ100V
Resistor
0805
10Ω
Panasonic
1
R25
ERJ-6ENF7502V
Resistor
0805
75kΩ
Panasonic
R26
OPEN
4
-12V,
GND,
LED+,
LED-
1502-2
Test Post
TP 1502
0.109"
Keystone
3
ADJ,
PWM,
VINX
1593-2
Test Post
TP 1593
0.084"
Keystone
Zetex Inc.
0805
AN-1736 LM3433 HB LED Driver Evaluation Kit
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Figure 2. Load Board Schematic
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Table 3. Load Board BOM
ID
8
Part Number
Type
Size
Parameters
Qty
Vendor
1
Lumex
1
ON
Semiconductor
Lumex
C1, C2
OPEN
D1
SSL-LX5063ID
Red LED
T 1 3/4
0805
D2
BZX84C15LT1
Zener Diode
SOT-23
D3
SSL-LX5063GD
Green LED
T 1 3/4
1
D4
SSL-LX5093USBD
Blue LED
T 1 3/4
1
Lumex
H1
7-339-4PP-BA
Heatsink
TO-220 Bolt
On
1
IREC-CTS
J1
S9001
Connector
1X2 Header
1X2 Pin Header
1
Sullins
Electronics
Corp .
225mW, 15V
P1
3429-6002
Connector
HDR13x2
13X2 Pin Header
1
3M
Q1
Si4884DY
FET
SO-8
30V, 16mΩ
1
VishaySiliconix
Q2
FZT649
NPN
SOT-223
1
Zetex Inc.
Q3
D44H
NPN
TO-220
60V, 10A
1
ON
Semiconductor
R1, R2
WSL2010R0100FEA18
Resistor
2010
0.01Ω
2
Vishay
R3
ERJ-6ENF20R0V
Resistor
0805
20Ω
1
Panasonic
R4
9C08052A1004JLHFT
Resistor
0805
1MΩ
1
Yageo
Corporation
R5
PV36X102C01B00
Potentiometer
0805
250Ω
1
Murata
R6, R7
ERJ-6ENF1000V
Resistor
0805
100Ω
2
Panasonic
R8
MCR10EZHF4700
Resistor
0805
470Ω
1
Rohm
R9
ERJ-6GEYJ391V
Resistor
0805
390Ω
1
Panasonic
R10
ERJ-6GEYJ331V
Resistor
0805
330Ω
1
Panasonic
SW1
F1107015ACFA06E
TO-220
w/leads
70deg. C.N.O.
1
Canthem
+, -, ANODE, +, -,
CATHODE,
GATE
1502-2
TP 1502
0.109"
7
Keystone
AN-1736 LM3433 HB LED Driver Evaluation Kit
Test Post
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Figure 3. LED DIM Adapter Board Schematic
Table 4. Adapter Board Bill of Materials (BOM)
Qty
ID
Part Number
R1
OPEN
Parameters
Vendor
1
D1
BZX84C15LT1
Zener Diode
SOT-23
225mW, 15V
ON
Semiconductor
1
P1
3429-6002
Connector
HDR13x2
13X2 Pin
Header
3M
1
Q1
Si4884DY
FET
SO-8
30V, 16mΩ
VishaySiliconix
7
ANODE, CATHODE,
GATE
1502-2
Test Post
TP 1502
0.109"
Keystone
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Type
Size
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Typical Performance Characteristics
7
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Typical Performance Characteristics
97
96
2A
4A
6A
8A
96
94
94
EFFICIENCY (%)
EFFICIENCY (%)
95
93
92
91
90
2A
4A
6A
8A
89
88
87
1
2
3
4
5
6
92
90
88
86
84
7
1
2
3
VLED (V)
6
7
Figure 5. Efficiency vs. LED Forward Voltage
(VCGND - VEE = 12V)
100
96
2A
4A
6A
8A
94
90
80
70
VSENSE (mV)
92
EFFICIENCY (%)
5
VLED (V)
Figure 4. Efficiency vs. LED Forward Voltage
(VCGND - VEE = 9V)
90
88
86
60
50
40
30
84
20
82
10
80
1
2
3
4
5
6
7
0
0.2
0.4
Figure 6. Efficiency vs. LED Forward Voltage
(VCGND - VEE = 14V)
AN-1736 LM3433 HB LED Driver Evaluation Kit
0.6
0.8
1
1.2
1.4
1.6
ADJ VOLTAGE (V)
VLED (V)
10
4
Figure 7. VSENSE vs. VADJ
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Typical Performance Characteristics
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ILED = 6A nominal, VIN = 3.3V, VEE = -12V Top trace: DIM input, 2V/div, DC Bottom trace: ILED, 2A/div, DC T = 10µs/div
Figure 8. 30kHz PWM Dimming Waveform Showing Inductor Ripple Current
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Layout
8
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Layout
Figure 9. Top Layer and Top Overlay
12
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Layout
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Figure 10. Upper Middle Layer
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Layout
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Figure 11. Lower Middle Layer
14
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Figure 12. Bottom Layer and Bottom Overlay
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