MAX17681EVKIT# Datasheet

MAX17681EVKIT# Datasheet
MAX17681 Evaluation Kit
General Description
The MAX17681 evaluation kit (EV kit) is a fully assembled
and tested circuit board that demonstrates the performance
of the MAX17681 high-efficiency, iso-buck DC-DC converter.
The EV kit operates over a wide input voltage range of
17V to 32V and uses primary-side feedback to regulate
the output voltage. The EV kit has two output configurations. In the first configuration, the output is programmed to
±15V at 100mA, with ±10% output-voltage regulation. The
second configuration uses a post regulator (MAX17651) to
produce ±12V at 50mA with < ±3% regulation.
The EV kit comes installed with the MAX17681 in a 10-pin
(3mm x 2mm) TDFN package and MAX17651 in a 6-pin
TSOT package.
Features
●● 17V to 32V Input Voltage Range
●● ±15V, 100mA or ±12V, 50mA Continuous Current
●● EN/UVLO Input
●● 200kHz Switching Frequency
●● 90% Peak Efficiency
●● Overcurrent Protection
●● No Optocoupler
●● Delivers Up to 3W Output Power
●● Overtemperature Protection
●● Proven PCB layout
Evaluates: MAX17681 for Isolated ±15V
or ±12V Output Configuration
Quick Start
Recommended Equipment
●● One 15V to 60V DC, 0.5A power supply
●● Two loads of 50mA to 100mA sink capacity
●● Four digital multimeters (DMM)
Caution: Do not turn on the power supply until all
connections are completed.
Procedure
The EV kit comes with default output configuration
programmed to ±15V.
Test Procedure for ±15V Output
1) Verify that jumper JU1 is open.
2) Verify that the R17–R19 are not installed.
3) Set the power-supply output to 24V. Disable the
power supply.
4) Connect the positive terminal of the power supply to
the VIN PCB pad and the negative terminal to the
nearest PGND PCB pad. Connect the positive terminal
of the first 100mA load to the +15V PCB pad and the
negative terminal to the nearest GND0 PCB pad.
Connect the positive terminal of the second 100mA
load to the GND0 PCB pad and the negative terminal
to the nearest -15V PCB pad.
5) Connect a DMM configured in voltmeter mode
across the +15V PCB pad and the nearest GND0
PCB pad. Connect another DMM configured in
voltmeter mode across the -15V PCB pad and the
nearest GND0 PCB pad.
6) Enable the input power supply.
Ordering Information appears at end of data sheet.
7) Enable the loads and verify that the output voltage is
at ±15V with respect to GND.
8) If required, vary the input voltage from 17V to 32V,
the load current from 0 to 100mA, and verify that the
output voltage is ±15V.
19-7634; Rev 2; 2/17
Evaluates: MAX17681 for Isolated ±15V
or ±12V Output Configuration
MAX17681 Evaluation Kit
Detailed Description
Test Procedure for ±12V Output
1) Verify that JU1 is open.
2) Remove R16 and R10. Place 0Ω resistors in R18
and R19. Place a 681kΩ pack-out resistor (comes
with EV kit package) in R17.
3) Set the power-supply output to 24V. Disable the
power supply.
4) Connect the positive terminal of the power supply
to the VIN PCB pad and the negative terminal to
the nearest PGND PCB pad. Connect the positive
terminal of the first 50mA load to the +12V PCB pad
and the negative terminal to the nearest GND0 PCB
pad. Connect the positive terminal of the second
50mA load to the GND0 PCB pad and the negative
terminal to the nearest -12V PCB pad.
5) Connect a DMM configured in voltmeter mode
across the +12V PCB pad and the nearest GND0
PCB pad. Connect another DMM configured in
voltmeter mode across the -12V PCB pad and the
nearest GND0 PCB pad.
6) Enable the input power supply.
7) Enable the loads and verify that the output voltage is
at ±12V with respect to GND.
8) If required, vary the input voltage from 17V to 32V,
the load current from 0 to 50mA, and verify that the
output voltage is ±12V.
The EV kit is a fully assembled and tested circuit board
that demonstrates the performance of the MAX17681
high-efficiency, iso-buck DC-DC converter designed to
provide isolated power up to 3W. The EV kit generates
either ±15V, 100mA or ±12V, 50mA output voltages from
a 17V to 32V input supply. The EV kit features a forcedPWM control scheme that provides constant switchingfrequency of 200kHz operation at all load and line conditions.
The EV kit includes an EN/UVLO PCB pad to enable
control of the converter output. The VPRI PCB pad helps
measure the regulated nonisolated buck voltage. An
additional RESET PCB pad is available for monitoring
FB regulated voltage, the open-drain logic output. The
programmable soft-start feature allows users to reduce
input inrush current.
The iso-buck is a synchronous-buck-converter-based
topology, useful for generating isolated outputs at low
power level without using an optocoupler. The detailed
procedure for setting the soft-start time, ENABLE/UVLO
divider, primary output-voltage (VPRI) selection, adjusting
the primary output voltage, primary inductance selection,
turns-ratio selection, output capacitor selection, output
diode selection, and external loop compensation are
given in the MAX17681 IC data sheet. The post-regulator
MAX17651 output-voltage setting and additional related
information are detailed in the MAX17651 IC data sheet.
Enable Control (JU1)
The EN/UVLO pin on the device serves as an on/off
control while also allowing the user to program the input
undervoltage-lockout (UVLO) threshold. JU1 configures
the EV kit’s output for on/off control. Install a shunt across
JU1 pins 2-3 to disable VOUT. See Table 1 for proper JU1
jumper configurations.
Table 1. Enable Control (EN/UVLO) (JU1) Jumper Settings
SHUNT POSITION
EN/UVLO PIN
VOUT OUTPUT
1-2
Connected to VIN
Enabled
2-3
Open*
*Default position.
Connected to GND
Disabled
Connected to midpoint of R1, R2 resistor-divider
Enabled at VIN ≥ 15.5V
Component Suppliers
SUPPLIER
WEBSITE
Wurth Electronik
www.we-online.com
Murata Americas
www.murata.com
Panasonic Corp.
www.panasonic.com
Note: Indicate that you are using the MAX17681 when contacting these component suppliers.
www.maximintegrated.com
Maxim Integrated │ 2
Evaluates: MAX17681 for Isolated ±15V
or ±12V Output Configuration
MAX17681 Evaluation Kit
EV Kit Performance Report
EFFICIENCY vs. LOAD CURRENT
100
toc1
OUTPUT VOLTAGE
vs. LOAD CURRENT
17.00
90
16.50
70
VIN = 32V
60
OUTPUT VOLTAGE (V)
EFFICIENCY (%)
80
VIN = 24V
50
VIN = 17V
40
30
20
16.00
VIN = 32V
VIN = 17V
±15V OUTPUT
0
10
20
30
40
50
60
70
80
14.50
90 100
0
20
LOAD CURRENT (mA)
12.21
-14.8
12.20
-15
-15.2
VIN = 17V
-15.4
VIN = 24V
VIN = 32V
-15.8
-16
100
toc4
VIN = 17V
12.19
12.18
VIN = 24V
12.17
VIN = 32V
12.16
12.15
12.14
0
20
40
60
80
100
12.13
LOAD CURRENT (mA)
0
10
20
toc5
50
+15V output
VIN = 17V
-12.15
40
LOAD TRANSIENT RESPONSE (LOAD
CURRENT FROM 50mA TO 100mA ON +15V,
-15V LOADED WITH 100mA )
toc6
-12V OUTPUT
-12.14
30
LOAD CURRENT (mA)
OUTPUT VOLTAGE
vs. LOAD CURRENT
-12.13
OUTPUT VOLTAGE (V)
80
+12V output
12.22
-14.6
-15.6
60
OUTPUT VOLTAGE
vs. LOAD CURRENT
12.23
OUTPUT VOLTAGE (V)
OUTPUT VOLTAGE (V)
toc3
-15V output
-14.4
40
LOAD CURRENT (mA)
OUTPUT VOLTAGE
vs. LOAD CURRENT
-14.2
-16.2
VIN = 24V
15.50
15.00
10
0
toc2
+15V output
-12.16
-12.17
VIN = 32V
-12.18
VOUT (AC)
VIN = 24V
500mV/div
-12.19
-12.20
-12.21
IOUT
50mA/div
-12.22
-12.23
0
10
20
30
LOAD CURRENT (mA)
www.maximintegrated.com
40
50
400µS/div
Maxim Integrated │ 3
www.maximintegrated.com
U4
31
T1
28
U1
R18,R19
27
U2,U3
R17
26
29
R16
25
30
R12,R14
R13,R15
23
24
R10
R11
21
R8
20
22
R6
R5
17
R7,R9
R4
16
19
R3
15
18
R2
C15
10
R1
C14
9
14
C12,C13
8
13
C11
JU1
C7,C8,C9,C10
6
7
D1,D2
C6
5
11
C5
4
12
C2
C3,C4
2
C1
1
3
Designation
S NO
1
1
1
1
2
1
1
2
2
1
1
1
2
1
1
1
1
1
1
2
1
1
1
2
1
4
1
1
2
1
1
Qty
Description
Shunt regulator SOT25
MAX17651 TSOT LDO
MAX17681 TDFN10 3*2mm Iso buck DC-DC converter
EP10, 8-pin SMT, 50µH,1.4A, (1-4):(5-6):(7-8) = 1:1.8:1.8
0Ω ±1% resistor (0402)
681kΩ ±1% resistor (0402)
0Ω ±5% resistor (0805)
47.5kΩ ±1% resistor (0402)
909kΩ ±1% resistor (0402)
931kΩ ±1% resistor (0402)
562Ω ±1% resistor (0402)
82.5kΩ ±1% resistor (0402)
22kΩ ±1% resistor (0402)
100kΩ ±5% resistor (0402)
4.75kΩ ±1% resistor (0402)
10.5kΩ ±1% resistor (0402)
90.9K Ohm±1% resistor (0402)
261K Ohm±1% resistor (0402)
3.01M Ohm±1% resistor (0402)
200V/1A, PowerDI®123
3-pin headers
22uF, 20%, 50V, ALUMINUM ELECTROLYTIC CAPACITOR
6.60*6.60mm,
0.01uF±10%, 50V, X7R ceramic capacitor (0402)
0.1uF±10%, 25V, C0G ceramic capacitor(0402)
1000PF ±10%,1500V, X7R ceramic capacitor (1206)
2.2uF±10%,50V, X7R ceramic capacitor (1206)
10uF±10%,16V, X7R ceramic capacitor (1206)
680pF±5%,50V,X7R ceramic capacitor (0402)
33nF±10%,25V, X7R ceramic capacitor (0402)
1µF±10% 16V X7R Ceramic capacitor (0603)
1µF±10%, 50V,X7R Ceramic capacitor (1206)
Manufacturer Partnumber-1
Diode Inc. TL431BW5
MAX17651AZT+
MAX17681ATB+
WURTH ELECTRONICS INC.
750342557
YAGEO PHYCOMP RC0402JR-070RL
YAGEO PHYCOMP RC0805JR-070RL
YAGEO PHYCOMP RC0805JR-070RL
VISHAY DALE CRCW04024752FK
VISHAY DALE CRCW0402909KFK
VISHAY DALE CRCW0402931KFK
PANASONIC ERJ-2RKF5620X
VISHAY DALE CRCW040282K5FK
VISHAY DALE CRCW040222K0FK
PANASONIC ERJ-2GEJ104X
VISHAY DALE CRCW04024K75FK
PANASONIC ERJ-2RKF1052
PANASONIC ERJ-2RKF9092X
VISHAY DALE CRCW0402261KFK
VISHAY DALE CRCW04023M01FK
Diode Inc. DFLS1200-7
SULLINS ELECTRONICS CORP
PEC03SAAN
Panasonic EEEFK1H220P
Murata GRM155R71H103KA88
Murata GRM155R71E104KE14
AVX 1206SC102KAT
Murata GRM31CR71H225KA88
Murata GRM31CR71C106KAC7
Murata GRM1555C1H681JA01
Murata GRM155R71E333KA88
Murata GRM188R71C105KA12
Murata GRM31CR71H105KA61
Mftr PN-2
VENKEL LTD CR0402-16W000RJT
VISHAY DALE
9C04021A4752FLHF3
BOURNS CR0402-FX-8252GLF
KEMET C0402C103K5RAC
TAIYO YUDEN UMK316B7225K
TDK C1005C0G1H681G050
KEMET C0603C105K4RAC
KEMET C1206C105K5RAC
Mftr PN-3
VISHAY DALE CRCW040247K5FK
VENKEL LTD C0402C0G500-681JNP
TDK C1608X7R1C105K
Murata GRM31MR71H105KA88
Murata GRM1555C1H681GA01
TAIYO YUDEN EMK107B7105KA
Mftr PN-4
MAX17681 Evaluation Kit
Evaluates: MAX17681 for Isolated ±15V
or ±12V Output Configuration
MAX17681 EV Kit Bill of Materials
Maxim Integrated │ 4
MAX17681 Evaluation Kit
Evaluates: MAX17681 for Isolated ±15V
or ±12V Output Configuration
MAX17681 EV Kit PCB Layout Diagrams
Figure 1. MAX17681 EV Kit Component Placement Guide—
Component Side
Figure 2. MAX17681V EV Kit PCB Layout—Component Side
Figure 3. MAX17681 EV Kit PCB Layout—Solder Side
www.maximintegrated.com
Maxim Integrated │ 5
RESET
EN/UVLO
SGND
VIN
2
+
1
J1
C14
2
VIN
R1
3.01M
1UF
C1
RESET
EN/UVLO
0.01UF
C15
22UF
1
3
PGND
261K
R2
1UF
C2
EN/UVLO
5
4
VCC
3
2
1
FB
VCC
EN/UVLO
VIN
PGND
EP
8
7
6
COMP
SS
RESET
0.033UF
C3
9
10
GND
LX
RESET
U1
MAX17681ATB+
11
680PF
C5
R5
SGND
0.033UF
C4
100K
4.75K
R6
VCC
10UF
C6
PGND
10.5K
R4
90.9K
R3
VPRI
4
1
PRI
4
PGND
C11
1000PF
PACKOUT
681K
R17
1
T1
GND0
8
7
6
5
8
6
7
5
A
C
D2
A
C8
2.2UF
2.2UF
C7
C
2
1
562
R10
3
D1
+15V/0.1A
R11
R8
931K
82.5K
4
R16
-15V/0.1A
U4
R18
R9
22K
OPEN
0
0
www.maximintegrated.com
5
0
R19
22K
R7
OPEN
GND0
0.1UF
C12
0.1UF
C13
GND0
GND0
1
2
3
U2
OUT
FB
1
2
3
U3
OUT
6
5
4
FB
MAX17651
EN
GND PGOOD
IN
MAX17651
EN
GND PGOOD
IN
R12
6
5
4
47.5K
R13
909K
C9
47.5K
R15
909K
R14
2.2UF
C10
2.2UF
GND0
GND0
-12V/0.1A
+12V/0.1A
MAX17681 Evaluation Kit
Evaluates: MAX17681 for Isolated ±15V
or ±12V Output Configuration
MAX17681 EV Kit Schematic
Maxim Integrated │ 6
MAX17681 Evaluation Kit
Evaluates: MAX17681 for Isolated ±15V
or ±12V Output Configuration
Ordering Information
PART
TYPE
MAX17681EVKIT#
EV Kit
#Denotes RoHS compliant.
www.maximintegrated.com
Maxim Integrated │ 7
MAX17681 Evaluation Kit
Evaluates: MAX17681 for Isolated ±15V
or ±12V Output Configuration
Revision History
REVISION
NUMBER
REVISION
DATE
PAGES
CHANGED
0
5/15
Initial release
—
1
6/15
Updated Typical Operating Characteristics section, BOM, and schematic
1-3
2
2/17
Updated PCB Layout Diagrams
DESCRIPTION
4
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim Integrated’s website at www.maximintegrated.com.
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.
© 2017 Maxim Integrated Products, Inc. │ 8
Mouser Electronics
Authorized Distributor
Click to View Pricing, Inventory, Delivery & Lifecycle Information:
Maxim Integrated:
MAX17681EVKIT# MAX17681EVKITE#
Was this manual useful for you? yes no
Thank you for your participation!

* Your assessment is very important for improving the work of artificial intelligence, which forms the content of this project

Download PDF

advertising