MAX25611EVKIT [MAXIM]
MAX25611 Evaluation Kit;
| 型号： | MAX25611EVKIT |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | MAX25611 Evaluation Kit |
| 文件： | 总11页 (文件大小：508K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
Click here for production status of specific part numbers.
Evaluates: MAX25611A/MAX25611B
MAX25611 Evaluation Kit
General Description
Quick Start
The MAX25611 evaluation kit (EV kit) provides a proven
design to evaluate the MAX25611A/MAX25611B auto-
motive high-voltage, 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 0.88A 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 GND (boost mode) or IN
(buck-boost mode). In the case of boost mode, the input
voltage should not exceed the LED string voltage.
Required Equipment
● MAX25611 EV kit
● 12V, 5A DC power supply
● A series-connected LED string rated at least 1A
● Oscilloscope with a current probe
Procedure
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) Verify that all jumpers (J1, J2, and J7) are in their
default positions, as shown in Table 1.
Benefits and Features
● Configured for Boost and Buck-Boost Application
● Analog Dimming Control
● Proven PCB Layout
2) Connect the positive terminal of the 12V supply to the
VIN PCB pad and the negative terminal to the nearest
GND PCB pad.
3) Connect the LED string across the LED+ and LED-
PCB pads on the EV kit for buck-boost configura-
tion. For boost configuration, connect the LED string
across the LED+ and GND PCB pads on the EV kit.
The LED string voltage should be higher than the
input voltage in this configuration.
● Fully Assembled and Tested Feature
Ordering Information appears at end of data sheet.
4) Clip the current probe on the wire connected to the
LED string.
5) Turn on the DC power supply.
6) Verify that the LEDs turn on.
7) Verify that the oscilloscope displays approximately
0.88A.
319-100334; Rev 1; 3/19
Evaluates: MAX25611A/MAX25611B
MAX25611 Evaluation Kit
Alternatively, the analog dimming can be controlled by
removing the shunt on J2 and applying a voltage between
0 and 5.5V on the REFI test point on the EV kit. REFI
voltages above 1.3V are limited to an equivalent of 1.3V
inside the IC.
Detailed Description
The MAX25611 EV kit provides a proven design to evalu-
ate the MAX25611A/MAX25611B 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 string-
forward voltage can vary from 3V to 36V. The EV kit is
optimized for 0.8A and a series of 8 LEDs in a string. Other
configurations may require changes to component values.
Pulse-Dimming Input (PWMDIM)
The EV kit demonstrates the PWM dimming feature of the
buck controller using either an external PWM signal, or a
DC voltage at the DIM pin.
Analog Dimming Control (REFI)
Analog-to-PWM dimming: Install a shunt across J1
(1-2). Adjust the potentiometer R18 to set a DC voltage on
the PWMDIM pin. The PWM dimming duty cycle is set by
the voltage at PWMDIM between 0.2V (0% duty) and 3V
(100% duty). Alternatively, drive the PWMDIM testpoint
with an external DC source. PWMDIM voltages above 3V
set the dimming duty cycle to 100%.
When J2 is installed across pins 1-2, the LED current is
set at the maximum current. The REFI pin is connected
to VCC and in this case, the LED current is given by the
following equation:
220mV
I
=
LED
R14
Direct PWM dimming: Leave J1 open and connect a
PWM signal to the PWMDIM testpoint. Vary the duty cycle
to increase or decrease the intensity of the HB LED string.
The PWMDIM input of the device has a 2V (max) rising
threshold and a 0.8V (min) falling threshold and is com-
patible with 3.3V and 5V logic-level signals. Uninstall C2
to achieve fast PWMDIM rise and fall edges at the IC pin.
In the case of the EV kit, I
is set to 0.88A.
LED
When J2 is installed across pins 2-3, the REFI pin is con-
nected to the voltage-divider of R1 and R2, which sets the
REFI voltage. If V
current level.
< 1.2V, then V
sets the LED
REFI
REFI
V
− 0.2V
)
(
REFI
I
=
LED
5×R14
Table 1. MAX25611 EV Kit Jumper Descriptions
SHUNT
JUMPER
DESCRIPTION
POSITION
Connects the PWMDIM pin of the device to VCC through a voltage divider formed by R13
and R18. The dimming duty cycle is adjusted from 0% to 100% for PWMDIM level between
0.2V and 3V. The dimming frequency is internally set at 200Hz.
1-2*
2-3
Connects the PWMDIM pin to ground to disable the analog dimming function and keep the IC off.
J1
Connect an external function generator to drive the PWMDIM pin with a signal from 0 to 3.3V
or higher. PWMDIM pulse width should be at least above one switching period.
Open
Recommended PWMDIM frequency range is from 200Hz to 2kHz for visible LEDs.
IR LEDs can operate at lower frequencies where flicker is not visible.
1-2*
2-3
Connects VCC to the REFI pin. LED current is at the maximum value of 0.88A in this configuration.
Connects the REFI pin of the device to VCC through a voltage divider formed by R1 and R2.
Adjusting R2 allows programming the LED current from 0 to 0.88A for REFI levels from 0.2V to 1.3V.
For REFI voltages above 1.3V, the LED current is limited at 0.88A.
J2
Connect an external voltage source to set the LED current from 0 to 0.88A for REFI levels
from 0.2V to 1.3V. For REFI voltages above 1.3V, the LED current is limited at 0.88A.
Open
1-2*
Connects the IN pin to the same input supply as the boost power stage through a 10Ω filter resistor.
Connect an external supply voltage greater than 4.7V to J7 pin 2 to bias the IC IN pin.
J7
Open
*Default position.
Maxim Integrated
│ 2
www.maximintegrated.com
Evaluates: MAX25611A/MAX25611B
MAX25611 Evaluation Kit
2.2MHz Operation
The EV kit can be used to evaluate 2.2MHz operation. To
test the 2.2MHz application:
Voltage Regulator Configuration
The EV kit can be reconfigured as a voltage regulator
using R27 and R28 as the voltage feedback resistor
divider, after removing R14.
● Change the IC to MAX25611B (provided).
● Change L2 to 2.2µH.
V
− 0.2
)
(
R27 + R28
(
)
REFI
● Change C9 to 0.22µF. R6 remains at 50Ω.
V
=
×
OUT
5
R27
● Output capacitance can be reduced to 1x 4.7µF. Note
that short pulse widths at low frequencies benefit from
having higher total output capacitance to counter leak-
age currents that discharge the output voltage before
the next pulse.
Setting V
= 1.2V selects a large feedback signal for
REFI
better accuracy and noise immunity. For simplicity, select
R27 to match the programmed regulation voltage across
ISENSEP and ISENSEN. For example, with V
= 1.2V,
REFI
● Change other components as required (e.g., MOSFET,
FET current sense R9, LED current sense R14).
V(ISENSEP - ISENSEN) = 200mV, and R27 should be
200Ω. This makes 1mV per Ω or 1mA down the resis-
tor string, minimizing the error due to ISENSEN leakage
current. The calculation for R28 is then simplified to
(VOUT - 0.2) x 1000.
High-Beam/Low-Beam Application
The EV kit can be used to evaluate high-beam/low-beam
switching applications. Connect the low-beam LED string
across LED+ and HB_LED+, and the high-beam LED
string across HB_LED+ and GND. Use a function genera-
tor or a DC source to drive the HIGHBEAM_OFF pad to
5V or GND to disabled or enable the high-beam LEDs.
Slew rate control of the driving signal, or adjustment of
R19 and C17 values can be used to control the transi-
tion of the Q3 shunting FET to minimize surge currents
through the low-beam LEDs.
The following components should also be changed:
● Power stage components (Q1, L2, D1, R9 and output
capacitance) as required for the application (voltage,
current rating, etc).
● COMP components (R6, C9, C16) to match the appli-
cation requirements.
● Remove C14, R17, and Q2.
Ordering Information
Latch Circuit
The latch circuit proves HB+LED+ short-to-battery protec-
tion by disabling the shunt FET gate. This prevents the
shunt FET from shorting out the battery. The latch is reset
by removing power to recycle VCC.
PART
TYPE
MAX25611EVKIT#
EV Kit
#Denotes RoHS compliance.
Maxim Integrated
│ 3
www.maximintegrated.com
Evaluates: MAX25611A/MAX25611B
MAX25611 Evaluation Kit
MAX25611 EV Kit Bill of Materials
ITEM
REF_DES
DNI/DNP
QTY
MFG PART #
MANUFACTURER
VALUE
DESCRIPTION
GRM32ER72A225KA35;
CGA6N3X7R2A225K230;
CC1210KKX7R0BB225
MURATA;TDK;
YAGEO
CAPACITOR; SMT (1210); CERAMIC CHIP; 2.2UF; 100V; TOL = 10%;
MODEL = GRM SERIES; TG = -55°C to +125°C; TC = X7R
1
C1, C19
—
2
2.2UF
CAPACITOR; SMT (0603); CERAMIC CHIP; 0.01UF; 100V; TOL = 5%;
MODEL = MULTILAYER CERAMIC CHIP CAPACITOR; TC = NPO
2
3
4
5
C2, C16
C3
—
—
—
—
2
1
6
1
CGA3EANP02A103J080AC
EEE-TG2A220UP
TDK
PANASONIC
TDK;TDK
TDK
0.01UF
22UF
CAPACITOR; SMT (CASE_F); ALUMINUM-ELECTROLYTIC; 22UF;
100V; TOL = 20%; MODEL = TG SERIES; TG = -40°C TO +125°C
C4, C5,
C11-C13, C15
CGA6M3X7S2A475K200AE;
CGA6M3X7S2A475K200AB
CAPACITOR; SMT (1210); CERAMIC CHIP; 4.7UF; 100V;
TOL = 10%; TG = -55°C TO +125°C; TC = X7S; AUTO
4.7UF
4.7UF
CAPACITOR; SMT (0603); CERAMIC CHIP; 4.7UF; 10V;
TOL = 10%; TG = -55°C TO +105°C; TC = X6S
C6
C1608X6S1A475K
GCJ188R71H104KA12;
GCM188R71H104K;
CGA3E2X7R1H104K080AA
MURATA;
MURATA;TDK
CAPACITOR; SMT (0603); CERAMIC CHIP; 0.1UF; 50V;
TOL = 10%; TG = -55°C TO +125°C; TC = X7R; AUTO
6
C7, C8
—
2
0.1UF
GCM188R71C105KA64;
CGA3E1X7R1C105K080AC
CAPACITOR; SMT (0603); CERAMIC CHIP; 1UF; 16V; TOL = 10%;
TG = -55°C TO +125°C; TC = X7R; AUTO
7
8
9
C9
—
—
—
1
1
1
MURATA;TDK
MURATA;TDK
KEMET
1UF
GRM1885C1H102JA01;
C1608C0G1H102J080
CAPACITOR; SMT (0603); CERAMIC CHIP; 1000PF; 50V;
TOL = 5%; TG = -55°C TO +125°C
C10
C14
1000PF
100PF
CAPACITOR; SMT (0603); CERAMIC CHIP; 100PF; 100V;
TOL = 10%; MODEL = C0G; TG = -55°C TO +125°C; TC = +
C0603C101K1GAC
CAPACITOR; SMT (0603); CERAMIC CHIP; 4700PF; 100V;
TOL = 5%; MODEL = FT-CAP; TG = -55°C TO +125°C; TC = C0G
10
11
12
C17
C20
C21
—
—
—
1
1
1
C0603X472J1GAC
C0805C104J1RAC
KEMET
KEMET
TDK
4700PF
0.1UF
0.1UF
CAP; SMT (0805); 0.1UF; 5%; 100V; X7R; CERAMIC CHIP
CAPACITOR; SMT (0603); CERAMIC CHIP; 0.1UF; 100V;
TOL = 10%; TG = -55°C TO +125°C; TC = X7S
CGA3E3X7S2A104K080AB
DIODES
INCORPORATED
13
14
15
16
D1
D2
—
—
—
—
1
1
1
1
DFLS2100
1N4148WS-7-F
1N4148W-7-F
HF70ACB322513
DFLS2100
1N4148WS-7-F
1N4148W-7-F
52
DIODE; SCH; SMT (POWERDI-123); PIV = 100V; IF = 2A
DIODE; SWT; SMT (SOD-323); PIV = 75V; IF = 0.3A
DIODES
INCORPORATED
DIODES
INCORPORATED
DIODE; SWT; SMT (SOD-123); PIV = 100V;
IF = 0.3A; -65°C TO +150°C
D5
INDUCTOR; SMT (1210); FERRITE-BEAD; 52;
TOL = ±25%; 0.4A; -40°C TO +125°C
FB1
TDK
GND, HB_LED+,
HIGHBEAM_OFF, J3-J6,
LED+, LED-, VCC, VIN
EVK KIT PARTS; MAXIM PAD; WIRE; NATURAL; SOLID;
WEICO WIRE; SOFT DRAWN BUS TYPE-S; 20AWG
17
—
11
9020 BUSS
WEICO WIRE
MAXIMPAD
CONNECTOR; MALE; THROUGH HOLE; BREAKAWAY;
STRAIGHT THROUGH; 3PINS; -65°C TO +125°C
18
19
J1, J2
J7
—
—
2
1
PCC03SAAN
PCC02SAAN
SULLINS
SULLINS
PCC03SAAN
PCC02SAAN
CONNECTOR; MALE; THROUGH HOLE; BREAKAWAY;
STRAIGHT THROUGH; 2PINS; -65°C TO +125°C
INDUCTOR; SMT; FERRITE BOBBIN CORE; 4.7UH;
TOL = ±0.2; 6.2A; -40°C TO +125°C
20
21
22
23
24
L1
L2
—
—
—
—
—
1
1
4
1
1
MSS1278T-472ML
MSS1278T-153ML
9032
COILCRAFT
COILCRAFT
4.7UH
15UH
INDUCTOR; SMT; FERRITE; 15UH; 20%; 4.9A
MACHINE FABRICATED; ROUND-THRU HOLE SPACER;
NO THREAD; M3.5; 5/8IN; NYLON
MH1-MH4
Q1
KEYSTONE
9032
SQJA86EP-T1_GE3
FDC3535
VISHAY SILICONIX
SQJA86EP-T1_GE3
FDC3535
TRAN; NCH; SO-8L; PD-(48W); I-(30A); V-(80V)
FAIRCHILD
SEMICONDUCTOR
TRAN; P-CHANNEL POWER TRENCH MOSFET; PCH;
SSOT-6; PD-(1.6W); I-(-2.1A); V-(-80V)
Q2
Maxim Integrated
│ 4
www.maximintegrated.com
Evaluates: MAX25611A/MAX25611B
MAX25611 Evaluation Kit
MAX25611 EV Kit Bill of Materials (continued)
ITEM
REF_DES
DNI/DNP
QTY
MFG PART #
MANUFACTURER
VALUE
DESCRIPTION
TRAN; N-CHANNEL POWERTRENCH MOSFET; NCH;
SUPERSOT-6; PD-(1.6W); I-(3A); V-(80V)
25
Q3
—
1
FDC3512
ON SEMICONDUCTOR
FDC3512
FAIRCHILD
SEMICONDUCTOR
TRAN; SMALL SIGNAL TRANSISTOR; PNP; SOT-23;
PD-(0.35W); IC-(-0.6A); VCEO-(-60V)
26
Q4
—
1
MMBT2907A
MMBT2907A
27
28
Q5
R1
—
—
1
1
MMBT2222LT1G
ON SEMICONDUCTOR
VISHAY DALE
MMBT2222LT1G
24.9K
TRAN; NPN; SOT-23; PD-(0.225W); I-(0.6A); V-(30V)
CRCW060324K9FK
RESISTOR; 0603; 24.9KΩ; 1%; 100PPM; 0.10W; THICK FILM
RESISTOR; THROUGH-HOLE-RADIAL LEAD; 3296 SERIES;
10KΩ; 10%; 100PPM; 0.5W; SQUARE TRIMMING POTENTIOMETER;
25 TURNS; MOLDER CERAMIC OVER METAL FILM
29
30
R2, R18
R3, R4
—
—
2
2
3296W-1-103LF
BOURNS
10K
100
CRCW0603100RFK;
ERJ-3EKF1000;
RC0603FR-07100RL
VISHAY DALE;
PANASONIC
RESISTOR; 0603; 100Ω; 1%; 100PPM; 0.10W; THICK FILM
31
32
R6
R7
—
—
1
1
CRCW060349R9FK
CRCW06033K32FK
VISHAY DALE
VISHAY DALE
49.9
RESISTOR; 0603; 49.9Ω; 1%; 100PPM; 0.10W; THICK FILM
3.32K
RESISTOR; 0603; 3.32K; 1%; 100PPM; 0.10W; THICK FILM
CRCW06030000ZS;
MCR03EZPJ000;
ERJ-3GEY0R00
R8, R12,
R16, R17
VISHAY DALE;ROHM;
PANASONIC
33
—
4
0
RESISTOR; 0603; 0Ω; 0%; JUMPER; 0.10W; THICK FILM
34
35
R9
—
—
1
1
ERJ-8CWFR043
PANASONIC
0.043
475K
RESISTOR; 1206; 0.043Ω; 1%; 75PPM; 1W; THICK FILM
RESISTOR; 0603; 475KΩ; 0.1%; 100PPM; 0.1W; THICK FILM
R10
CRCW0603475KFK
VISHAY DALE
CRCW060310K0FK;
ERJ-3EKF1002
VISHAY DALE;
PANASONIC
36
R11
—
1
10K
RESISTOR; 0603; 10K; 1%; 100PPM; 0.10W; THICK FILM
37
38
39
40
41
42
43
44
45
R13
R14
—
—
—
—
—
—
—
—
—
1
1
1
1
1
1
2
1
1
CRCW06033K00FK
LRC-LR2512LF-01-R250F
CRCW06031M00JN
CRCW060320K0JN
ERA-V15J100V
VISHAY DALE
TT ELECTRONICS
VISHAY DALE
VISHAY DALE
PANASONIC
3K
0.25
1M
RESISTOR; 0603; 3KΩ; 1%; 100PPM; 0.10W; THICK FILM
RESISTOR; 2512; 0.25Ω; 1%; 100PPM; 2W; THICK FILM
RESISTOR; 0603; 1MΩ; 5%; 200PPM; 0.10W; METAL FILM
RESISTOR; 0603; 20KΩ; 5%; 200PPM; 0.10W; METAL FILM
RESISTOR; 0603; 10Ω; 5%; 1500PPM; 0.063W; METAL FILM
RESISTOR; 1206; 0.1Ω; 1%; 100PPM; 0.5W; THICK FILM
RESISTOR; 0603; 1KΩ; 5%; 200PPM; 0.10W; THICK FILM
RESISTOR, 0603, 10KΩ, 5%, 200PPM, 1/16W, THICK FILM
RESISTOR; 0603; 4.7KΩ; 5%; 200PPM; 0.10W; THICK FILM
R15
R19
20K
10
R21
R22
LRC-LR1206LF-01-R100-F
ERJ-3GEYJ102V
TT ELECTRONICS
PANASONIC
0.1
R23, R25
R24
1K
301-10K-RC
XICON
10K
4.7K
R26
ERJ-3GEYJ472V
PANASONIC
TEST POINT; JUMPER; STR; TOTAL LENGTH = 0.24IN;
BLACK; INSULATION = PBT;PHOSPHOR BRONZE
CONTACT = GOLD PLATED
46
SU1-SU3
—
3
S1100-B;SX1100-B
KYCON;KYCON
SX1100-B
CONNECTOR; PANELMOUNT; BINDING POST;
STRAIGHT THROUGH; 1PIN; RED
47
48
TP1
TP2
—
—
1
1
7006
7007
KEYSTONE
KEYSTONE
7006
7007
CONNECTOR; PANELMOUNT; BINDING POST;
STRAIGHT THROUGH; 1PIN; BLACK
EVKIT PART - IC; MAX25611ATC;
49
U1
—
1
MAX25611ATC
MAXIM
MAX25611ATC
PACKAGE OUTLINE DRAWING: 21-0139;
LAND PATTERN DRAWING: 90-0068; TQFN16-EP
50
51
PCB
C18
—
1
0
MAX25611
MAXIM
KEMET
PCB
PCB:MAX25611
DNP
C0805C104J1RAC
0.1UF
CAP; SMT (0805); 0.1UF; 5%; 100V; X7R; CERAMIC CHIP
DIODES
INCORPORATED
DIODE; SWT; SMT (SOD-123); PIV = 100V;
IF = 0.3A; -65°C TO +150°C
52
D3
DNP
0
1N4148W-7-F
1N4148W-7-F
53
54
55
R5
DNP
DNP
DNP
DNP
0
0
0
ERJ-8CWFR043
CRCW0603499KFK
CRCW0603220RFK
CRCW060360K4FK
PANASONIC
VISHAY DALE
VISHAY DALE
VISHAY DALE
0.043
499K
220
RESISTOR; 1206; 0.043Ω; 1%; 75PPM; 1W; THICK FILM
RESISTOR; 0603; 499KΩ; 1%; 100PPM; 0.1W; THICK FILM
RESISTOR; 0603; 220Ω; 1%; 100PPM; 0.10W; THICK FILM
RESISTOR, 0603, 60.4KΩ, 1%, 100PPM, 0.1W, THICK FILM
R20
R27
R28
56
0
60.4K
TOTAL
80
Maxim Integrated
│ 5
www.maximintegrated.com
Evaluates: MAX25611A/MAX25611B
MAX25611 Evaluation Kit
MAX25611 EV Kit Schematics
6
5
2
1
ꢇ
ꢅ
2
1
5
1 N 4 1 4 8 W S - 7 - F
A
ꢃ
ꢄ 2
2
ꢅ
1 ꢅ
ꢂ
2
ꢅ
2
1
2
ꢕ
Maxim Integrated
│ 6
www.maximintegrated.com
Evaluates: MAX25611A/MAX25611B
MAX25611 Evaluation Kit
MAX25611 EV Kit PCB Layout Diagrams
1.0’’
MAX25611 EV Kit Component Placement Guide—Top Silkscreen
Maxim Integrated
│ 7
www.maximintegrated.com
Evaluates: MAX25611A/MAX25611B
MAX25611 Evaluation Kit
MAX25611 EV Kit PCB Layout Diagrams (continued)
1.0’’
MAX25611 EV Kit PCB Layout—Top View
Maxim Integrated
│ 8
www.maximintegrated.com
Evaluates: MAX25611A/MAX25611B
MAX25611 Evaluation Kit
MAX25611 EV Kit PCB Layout Diagrams (continued)
1.0’’
MAX25611 EV Kit PCB Layout—Bottom View
Maxim Integrated
│ 9
www.maximintegrated.com
Evaluates: MAX25611A/MAX25611B
MAX25611 Evaluation Kit
MAX25611 EV Kit PCB Layout Diagrams (continued)
1.0’’
MAX25611 EV Kit Component Placement Guide—Bottom Silkscreen
Maxim Integrated
│ 10
www.maximintegrated.com
Evaluates: MAX25611A/MAX25611B
MAX25611 Evaluation Kit
Revision History
REVISION REVISION
PAGES
CHANGED
DESCRIPTION
NUMBER
DATE
0
3/19
Initial release
—
1
3/19
Updated part number to MAX25611A/MAX25611B
1–11
For pricing, delivery, and ordering information, please visit Maxim Integrated’s online storefront at https://www.maximintegrated.com/en/storefront/storefront.html.
Maxim Integrated cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim Integrated product. No circuit patent licenses
are implied. Maxim Integrated reserves the right to change the circuitry and specifications without notice at any time.
©
Maxim Integrated and the Maxim Integrated logo are trademarks of Maxim Integrated Products, Inc.
2019 Maxim Integrated Products, Inc.
│ 11
相关型号：
©2020 ICPDF网 联系我们和版权申明