MAX20090 Evaluation Kit
Evaluates: MAX20090
General Description
Procedure
The MAX20090 evaluation kit (EV kit) provides a proven
design to evaluate the MAX20090 automotive high-volt-
age, high-brightness LED (HB LED) controller. The EV
kit is set up for boost and buck-boost configurations and
operates from a 6V to 18V DC supply voltage. The EV kit
is configured to deliver up to 1A to one string of LEDs.
The total voltage of the string can vary from 3V to 36V.
The anode of the LED string should be connected to
the LED+ terminal. The cathode of the LED string can
be connected either to PGND (boost mode) or IN (buck-
boost mode). In the case of boost mode, the input voltage
should not exceed the LED string voltage.
The EV kit is fully assembled and tested. Follow the steps
below to verify board operation.
Caution: Do not turn on
power supply until all connections are made.
1)
2)
Verify that all jumpers (J1–J4) are in their default
positions, as shown in
Table 1.
Connect the positive terminal of the 12V supply to the
IN PCB pad and the negative terminal to the nearest
GND1 PCB pad.
Connect the LED string across the LED+ and
LED- PCB pads on the EV kit for buck-boost
configuration. For boost configuration, connect the
LED string across the LED+ and GND2 PCB pads on
the EV kit. The LED string voltage should be higher
than the input voltage in this configuration.
Clip the current probe on the wire connected to the
LED string.
Turn on the DC power supply.
Verify that the LEDs turn on.
Verify that the oscilloscope displays approximately 1A.
3)
Features
●
Configured for a Boost and Buck-Boost Mode
●
Analog Dimming Control
●
Proven PCB Layout
●
Fully Assembled and Tested
4)
5)
6)
7)
Quick Start
Required Equipment
●
MAX20090 EV kit
●
12V, 5A DC power supply
●
A series-connected LED string rated at 1A
●
Oscilloscope with a current probe
Detailed Description
The MAX20090 EV kit provides a proven design to
evaluate the MAX20090 high-voltage HB LED driver with
integrated high-side current sense. The EV kit is set up for
boost and buck-boost configurations and operates from a
6V to 18V DC supply voltage. The EV kit is configured to
deliver up to 1A to a series LED string. The string-forward
voltage can vary from 3V to 36V.
Ordering Information
appears at end of data sheet.
19-8750; Rev 0; 12/16
MAX20090 Evaluation Kit
Evaluates: MAX20090
Table 1. MAX20090 EV Kit Jumper Descriptions (J1–J4)
JUMPER
SHUNT
POSITION
1-2*
J1
DESCRIPTION
Connects the PWMDIM pin of the device to VCC through a 4.99kΩ resistor.
The LEDs turn on when the input voltage goes above the UVLO level if J4 is open.
Connects the PWMDIM pin to ground through a 4.99kΩ resistor. Need to apply an external
PWM signal or a DC voltage on the PWMDIM PCB pad to turn on the LEDs when the input
voltage on IN is in the operating range.
Connects the PWMDIM pin to ground if J4 is installed; otherwise, PWMDIM pin is unconnected.
Connects VCC to the ICTRL pin. LED current is at the maximum value of 1.1A in this
configuration.
ICTRL pin is now connected to a voltage-divider from VCC to ground. Adjusting R2 allows
programming the LED current from 0 to 1.1A.
Disconnects the ICTRL pin of the device from the external voltage-divider on the VCC pin.
Allows the user to apply an external voltage to set the LED current level.
Connects the
FLT
pin to VCC through a 10kΩ resistor.
No pullup on
FLT
pin.
PWMDIM pin is controlled by the jumper J1 setting only.
Analog voltage on PWMDIM pin controlled by the voltage-divider of R13 and R18.
Adjust R18 to vary the analog voltage on PWMDIM. Jumper J1 should be in default position.
2-3
Open
1-2
J2
2-3*
Open
J3
1-2*
Open
Open*
J4
*Default
position.
1-2*
Analog Dimming Control (ICTRL)
When J2 is installed across pins 1-2, the LED current is
set at the maximum current. The ICTRL pin is connected
to VCC and in this case, the LED current is given by the
following equation:
I
LED
=
220mV
R14
When J2 is installed across pins 2-3, the ICTRL pin is
connected to the voltage-divider of R1 and R2, which sets
the voltage at ICTRL
In the case of the EV kit, I
LED
is set to 1A. If V
ICTRL
<
1.2V, then V
ICTRL
sets the LED current level.
Alternatively, the analog dimming can be controlled by
removing the shunt on J2 and applying a voltage between
0 and 5.5V on the ICTRL PCB pad on the EV kit.
This can be done by installing the shunt on J1 across
pins 2-3, without applying any external voltage on the
PWMDIM PCB pad. The PWMDIM pin can also be con-
trolled by an analog DC voltage on the PWMDIM pin. In
this case, the dimming frequency is internally set at 200Hz.
This can be achieved by installing the shunt on J1 across
pins 1-2, the shunt on J4 installed across pins 1-2, and
adjusting potentiometer R18. The dimming duty cycle can
be adjusted from 0 to 100% duty cycle by adjusting the
voltage on the PWMDIM pin from 0.2V to 3.25V.
Alternatively, PWM dimming can be achieved by applying
a DC voltage between 0.2V and 3.3V on the PWMDIM
PCB pad, with J1 and J4 open.
Ordering Information
PART
MAX20090EVKIT#
#Denotes RoHS compliant.
TYPE
EV Kit
Pulse-Dimming Input (PWMDIM)
Pulse dimming can be achieved by applying a pulsating
voltage source on the PWMDIM PCB pad on the EV kit.
When PWMDIM is pulled low,
DIMOUT
is pulled high and
the pulse-width-modulated (PWM) switching is disabled.
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MAX20090 Evaluation Kit
Evaluates: MAX20090
MAX20090 EV Kit Component List
PART
C1, C6, C9
C2, C7, C8, C10
C3, C14
C4, C5, C11–C13, C15
C16
C17
C18
D1
D2
J1, J2
J3, J4
L1
Q1
Q2
Q3
R1
R2, R18
R3
R4
R5
R6
R7
R8, R16, R17
R9
R10
R11, R12
R13
R14
R15
R19, R20
U1
—
—
QTY
3
4
2
6
1
1
0
1
0
2
2
1
1
1
1
1
2
1
1
1
1
1
3
1
1
2
1
1
1
2
1
3
1
DESCRIPTION
1uF ±10%, 16V X7R ceramic capacitors (0603)
0.1uF ±10%, 50V X7R ceramic capacitors (0603)
0.01uF ±10%, 100V X7R ceramic capacitors (0603)
4.7uF ±10% 100V X7R ceramic capacitors (1210)
TDK CGA6M3X7S2A475K200AE
0.022uF ±10%, 100V X7R ceramic capacitors (0603)
1000pF ±5%, 50V C0G ceramic capacitor (0603)
Murata GRM1885C1H102FA01
Not installed capacitor (0603)
100V, 3A Schottky diode (SMC)
Diodes Inc. B3100-13-F
Not installed diode
3 pin headers
2 pin headers
10uH, 5.7A ferrite core inductor
Coilcraft MSS1278-103ML
100V, 42A n-channel MOSFET (DPAK)
International Rectifier IRLR3110ZPbF
80V, 2.1A p-channel MOSFET (SSOT-6)
Fairchild Semiconductor FDC3535
Small signal pnp transistor (SOT23)
Fairchild Semiconductor MMBT2907A
24.9k ±1% resistor (0603)
10k potentiometers (9.53mmx4.83mmx10.03mm)
40.2k ±1% resistor (0603)
12.4k ±1% resistor (0603)
86.6k ±1% resistor (0603)
18.2 ±1% resistor (0603)
2.49k ±1% resistor (0603)
0ohm jumpers (0603)
0.025 ±1% sense resistor (2512)
Vishay Dale WSL2512R0250F
475k ±1% resistor (0603)
10.0k ±1% resistors (0603)
4.99k ±1% resistor (0603)
0.2 ±1% sense resistor (2512)
Vishay Dale WSL2512R2000F
1.00k ±1% resistor (0603)
499k ±1% resistors (0603)
Automotive High Voltage LED Controller (20 TQFN-EP)
Maxim MAX20090ATP/V+
Shunts
PCB: MAX20090 EVALUATION KIT
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10UH
3
MAX20090 EV Kit Schematics
J1
R10
0603
475K
1
1N4148W-7-F
3
OFF
C14
0603
C
R4
MAX20090
R9
0.025
WSL2512
50V
0
R11
0603
12.4K
11
IN
NDRV
CS
OVP
17
UVEN
PWMDIM
ISENSE-
DIMOUT
FLT
R15
0603
0.01UF
0603
IN
TQFN 4X4
BST
8
6
1
R7
9
NDRV
2.49K
0
C17
1000PF
0603
R14
R16
DNI
1
B
PWMDIM
ISENSE+
0.01UF
4.99K
R5
20
19
RT
V7V
COMP
VCC
R6
10
18
5
ICTRL
0
4
V7V
C3
0603
86.6K
RT
1K
V7V
VCC
C8
CS
OVP
15
ISENSE+
14
ISENSE-
13
DIMOUTB
4
FLTB
3
COMP
3
G
FDC3535
S
C1
C2
0.1UF
0603
Q2
D
1UF
0603
C6
NC
SGND
PGND
NC
VCC
2
7
12
16
21
16V
C9
J2
1
2
C7
1UF
0603
0.1UF
0603
EP
16V
C16
0.022UF
18.2
499K
R20
1
2
5
6
50V
16V
1UF
0603
LED+
LED+
GND2
J3
24.9K
R1
3
GND3
PWMDIM
3
3
0.1UF
0603
2
2
3
3
BOURNS_3296W
BOURNS_3296W
1
10K
10K
R2
R18
2
2
NDRV
VCC
1
2
IN
R12
LED-
1
1
1
J4
499K
R19
1
2
0603
10K
FLT
ICTRL
3
R13
100V
1W
10K
1W
WSL2512
0.2
2
0.1UF
0603
R8
D2
2
U1
DNI
A
C10
2
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1
C4
C11
4.7UF
1210
100V
4.7UF
1210
100V
4.7UF
1210
100V
4.7UF
1210
100V
L1
IN
2
Q1
IRLR3110ZTRPBF
A
D
C12
C13
C15
G
S
B3100-13-F
D1
C
MAX20090 Evaluation Kit
GND1
4.7UF
1210
100V
4.7UF
1210
100V
C5
MSS1278-103ML
VCC
BST
R3
1
40.2K
C18
E
C
MMBT2907A
Q3
R17
Evaluates: MAX20090
Maxim Integrated
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MAX20090 Evaluation Kit
Evaluates: MAX20090
MAX20090 EV Kit PCB Layouts
1.0’’
Component Placement Guide—Top
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