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MAX17682EVKIT# Evaluation Kit
Evaluates: MAX17682 for Isolated +12V
Output Configuration
General Description
The MAX17682 EV kit is a fully assembled and tested
circuit board that demonstrates the performance of the
MAX17682 high-efficiency, iso-buck DC-DC Converter.
The EV kit operates over a wide input-voltage range
of 16V to 42V and uses primary-side feedback to regulate
the output voltage. The EV kit has isolated output,
programmed to +12V at 750mA, with 10% output voltage
regulation.
The EV kit comes installed with the MAX17682 in a 20-pin
(4mm x 4mm) TDFN package.
Quick Start
Recommended Equipment
●
●
●
One 15V - 60V DC, 1A Power Supply
One resistive load 750mA sink capacity
Two Digital Multimeters (DMM)
Caution: Do not turn on the power supply until all
connections are completed.
Procedure
1)
2)
3)
Features
The EV kit comes with the default secondary output
programmed to +12V.
Verify that J1 is open
Set the power supply output to 24V. Disable the
power supply
Connect the positive terminal of the power supply to
the VIN PCB pad and the negative terminal to the
nearest PGND PCB pad. Connect a 750mA
resistive load across the +12V PCB pad and the
GND0 PCB pad.
Connect a DMM configured in voltmeter mode
across the +12V PCB pad and the nearest GND0
PCB pad.
Enable the input power supply.
Verify that output voltage is at +12V (with allowable
tolerance of 10%) with respect to GND0.
If required, vary the input voltage from 16V to 42V,
and the load current from 0mA to 750mA and verify
that output voltage is at +12V (with allowable tolerance
of 10%).
●
16V to 42V Input Voltage Range
● +12V, 750mA Continuous Current
● EN/UVLO Input
● 200kHz Switching Frequency
● 91% Peak Efficiency
● Overcurrent Protection
● No Optocoupler
● Delivers up to 10W Output Power
● Overtemperature Protection
● Proven PCB layout
4)
5)
6)
7)
Ordering Information
appears at end of data sheet.
319-100002; Rev 1; 4/18
MAX17682EVKIT# Evaluation Kit
Evaluates: MAX17682 for Isolated +12V
Output Configuration
The iso-buck is a synchronous-buck-converter-based
topology, useful for generating isolated outputs at low
power level without using an opto-coupler. The detailed
procedure for setting the soft-start time, ENABLE/UVLO
divider, primary output voltage (V
PRI
) 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 MAX17682 IC data sheet.
Detailed Description
The MAX17682EVKITA evaluation kit (EV kit) is a fully
assembled and tested circuit board that demonstrates
the performance of the MAX17682 high-efficiency, iso-
buck, DC-DC converter designed to provide an isolated
power up to 10W. The EV kit generates +12V, 750mA
voltages from a 16V to 42V input supply. The EV kit
features a forced-PWM control scheme that provides
constant switching-frequency of 200 kHz operation at all
load and line conditions.
The EV Kit includes an EN/UVLO PCB pad to monitor
and program the EN/UVLO pin of the MAX17682. The
VPRI PCB pad helps measure the regulated primary
output voltage (V
PRI
). An additional RESETB PCB pad
is available for monitoring the health of primary output
voltage (V
PRI
). RESETB pulls low if FB voltage drops
below 92%(typ) of its set value and RESETB goes high
impedance 1024 clock cycles after FB voltage rises
above 95% of its set value. The programmable soft-start
feature allows users to reduce the input inrush current.
Enable Control (J1)
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. Jumper J1
configures the EV kit’s output for turn-on/turn-off control.
Install a shunt across jumper J1 pins 2-3 to disable VOUT.
See
Table 1
for proper J1 jumper configurations.
Table 1. Enable Control (EN/UVLO) (J1) Jumper Settings
SHUNT POSITION
J1
1-2
2-3
Open*
*Default
position.
Note 1:
The secondary output diodes D1 is rated to carry short-circuit current only for few hundredths of a millisecond and is not
rated to carry the continuous short-circuit current.
Note 2:
The iso-buck converter typically needs 10% minimum load to regulate the output voltage. In this design when the +12V rail
is healthy, U2 sinks the minimum load current required to regulate the output voltages within ±10% regulation.
Connected to V
IN
Connected to GND
Connected to midpoint of R1, R2 resistor-divider
Always Enabled
Always Disabled
Enabled at V
IN
≥ 15V
EN/UVLO PIN
V
OUT
OUTPUT
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MAX17682EVKIT# Evaluation Kit
Evaluates: MAX17682 for Isolated +12V
Output Configuration
EV Kit Performance Report
EFFICIENCY vs. LOAD CURRENT
LOAD TRANSIENT RESPONSE
(LOAD CURRENT STEPPED
FROM 375mA to 700mA)
toc01
toc03
100.00
90.00
80.00
EFFICIENCY (%)
70.00
60.00
50.00
40.00
30.00
20.00
10.00
0.00
0
V
IN
= 16V
V
IN
= 24V
V
IN
= 42V
V
OUT
(AC)
500mV/div
I
OUT
100
200
300
400
500
600
700
800
500mA/div
400µs/div
LOAD CURRENT (mA)
18
16
OUTPUT VOLTAGE (V)
14
12
10
8
6
OUTPUT VOLTAGE
vs. LOAD CURRENT
toc02
FULL-LOAD SWITCHING WAVEFORMS
toc04
+12V output
V
IN
=24V
V
IN
=36V
LX
V
OUT
(AC)
20V/div
200mV/div
I
PRI
V
IN
=16V
2A/div
I
SEC
0
100
200
300
400
500
600
700
800
2A/div
2µs/div
LOAD CURRENT
(mA)
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MAX17682EVKIT# Evaluation Kit
Evaluates: MAX17682 for Isolated +12V
Output Configuration
Component Suppliers
SUPPLIER
Wurth Electronik
Murata Americas
Panasonic Corp.
www.we-online.com
www.murataamericas.com
www.panasonic.com
WEBSITE
Note:
Indicate that you are using the MAX17682 when contacting these component suppliers.
Ordering Information
PART
MAX17682EVKIT#
#Denotes
RoHS compliant.
TYPE
EVKIT
MAX17682 EV Kit Bill of Materials
S NO Designation
1
C1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
C2
C3
C4,C13
C5, C6
C7
C8
C9
C10
C11
C12
D1
JU1,JU2
R1
R2
R3
R4,R6,R10
R5
R8
R9
R7
T1
U1
U2
SU1,SU2
VIN, GND0,
PGND, SGND,
SYNC, VOUT,
VPRI, PGND1,
RESETB,
EN/UVLO
Qty
1
1
1
2
2
1
1
1
1
1
1
1
2
1
1
1
3
1
1
1
1
1
1
1
2
Description
2.2µF±10%, 100V,X7R Ceramic capacitor (1210)
47µF, 20%, 80V, ALUMINUM ELECTROLYTIC
CAPACITOR 6.60*6.60mm,
0.1µF±10%,100V, X7R ceramic capacitor (0603)
10µF±10%,16V, X7R ceramic capacitor (1210)
22µF±20%,10V, X7R ceramic capacitor (1210)
0.033µF±5%,25V,X7R ceramic capacitor (0402)
2200pF±10%,50V, X7R ceramic capacitor (0402)
0.015uF±10%, 16V, X7R ceramic capacitor (0402)
0.1uF±10%, 16V, X7R ceramic capacitor (0402)
2.2uF±10%,10V, X7R ceramic capacitor (0603)
2700pF±10%, 3000V, X7R ceramic capacitor (1812)
Diode, 200V/3A, SMA
3-pin headers
3.3M Ohm±1% resistor (0603)
287K Ohm±1% resistor (0603)
78.7K Ohm±1% resistor (0402)
10kΩ ±1% resistor (0402)
6.34kΩ ±1% resistor (0402)
12Ω ±1% resistor (0603)
40.2kΩ ±1% resistor (0402)
105kΩ ±1% resistor (0402)
EVKIT PART-TRANSFORMER; SMT; 1.67:1
MAX17682 TQFN10 4*4mm Iso buck DC-DC converter
Shunt regulator SOT25
See Jumper Table
Manufacturer Partnumber-1
Murata GRM32ER72A225KA35
Panasonic EEE-FK1K470P
Murata GRM188R72A104KA35
Murata GRM32DR71C106KA01
Murata GRM32ER71A226ME20
Murata GRM155R71E333KA88
Murata GRM155R71H222JA01
Murata GRM155R71C153KA01
Murata GRM155R61C104KA88
Murata GRM188R71A225KE15
AVX 1812HC272KAZ1A
Taiwan Semiconductor Corporation SK320A
R3G
SULLINS ELECTRONICS CORP PEC03SAAN
VISHAY DALE CRCW06033M30FK
VISHAY DALE CRCW0603287KFK
VISHAY DALE CRCW040278K7FK
VISHAY DALE CRCW040210K0FK
VISHAY DALE CRCW04026K34FK
VISHAY DALE RCS060312R0FK
VISHAY DALE CRCW040240K2FK
VISHAY DALE CRCW0402105KFK
WURTH ELECTRONICS INC. 750343160
MAX17682
ST MICROELECTRONICS TL431AIYDT
SULLINS ELECTRONICS CORP - STC02SYAN
Manufacturer Partnumber-2
TDK CGA6N3X7R2A225K230
Manufacturer Partnumber-3
TDK CC0603KRX7R0BB104
TDK C3225X7R1C106K
KEMET C1210C106K4RAC
KEMET C0402C153K4RAC
SAMSUNG CL10B225KP8NNN
YAGEO PHICOMP RC0402FR-0710K
26
10
Test Loops
WEICO WIRE - 9020 BUSS
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Maxim Integrated
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4
2
R2
R1
0.1UF
2.2UF
47UF
C3
+
C1
C2
2
PGND
R8
12
1
4
3
2
1
T1
4
3
40.2K
8
12
10UF
10UF
11
VIN
VIN
1
VIN
105K
EN/UVLO
C10
0.1UF
6
5
7
8
MAX17682EVKIT# Evaluation Kit
SGND
VCC
VCC
SGND
RESETB
PGND
FB
VCC
EP
MAX17682
RESETB
LX
NC
JU2
SYNC
2
U1
LX
REF
CATHODE
LX
NC
RT
BST
4
3
R9
11
12
C4
C13
1
3
ANODE
ANODE
ANODE
5
9
R6
10K
10K
ANODE
NC
2
3
6
PGND
COMP
8
7
14
15
16
EN/UVLO
21
VPRI
R5
C9
0.015UF
78.7K
22UF
22UF
EN/UVLO
RESETB
C8
R3
C5
C6
C7
0.033UF
6.34K
RESETB
SS
PGND
2.2UF
+8V,10mA
PGND
2200PF
R4
10K
C12
2700PF
PGND
SGND
PGND
Evaluates: MAX17682 for Isolated +12V
Output Configuration
GND0
7
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JU1
3
1
VIN
16V TO 42V
D1
VOUT
287K
EN/UVLO
3.3M
MAX17682 EV Kit Schematics
+12V,750mA
SYNC
R7
U2
TL431AIYDT
5
4
20
19
18
17
6
5
R10
8
7
C11
10
6
11
12
13
GND0
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