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MAX17690EVKITE#
No-Opto Flyback Evaluation Kit
Evaluates: MAX17690 No-Opto Flyback
with Secondary-Side Synchronous
Rectification
Quick Start
Recommended Equipment
● One 18V–36V DC, 1.5A power supply
●
16.5W resistive load with 5A sink capacity
● Four digital multimeters (DMM)
●
MAX17690EVKITE#
General Description
The MAX17690E evaluation kit (EV kit) is a fully assembled
and tested circuit board that demonstrates the operation
of an isolated 16.5W no-opto flyback DC-DC converter
with secondary-side synchronous rectification. This circuit
is implemented using the MAX17690, a no-opto, flyback
controller in a 16-pin TQFN package with an exposed
pad. The synchronous rectification on the secondary-
side is enabled by replacing the secondary diode with a
MOSFET to achieve 84.7% efficiency. The circuit uses the
MAX17606, a secondary-side synchronous rectifier driver
in a 6-pin SOT23 package for driving the secondary-side
MOSFET.
The EV kit output is configured for an isolated +3.3V
and provides up to 5A of output current. The EV kit is
programmed to operate at a 200kHz switching frequency.
The transformer provides the galvanic isolation between
input and output, up to 1500V
RMS
. The EV kit regulates
the output voltage within ±5% over the line, load, and
temperature without using the auxiliary winding/optocoupler
for output voltage feedback.
Warning
● Do not turn on the power supply until all connections
are completed.
●
Wear protective eye gear at all times.
● Do not touch any part of the circuit with bare hands/
conductive materials when powered up.
●
Make sure all high-voltage capacitors are fully
discharged before handling. Allow 5 minutes after
disconnecting input power source before touching
circuit parts.
Features
Ordering Information
appears at end of data sheet.
●
18V to 36V Input Range
● Isolated Output: 3.3V/5A DC
● Compact Design with High Frequency (200kHz) Switching
● No Optocoupler/Third Winding Required to Derive
Feedback Signal
●
84.7% Peak Efficiency
●
Galvanic Isolation up to 1500V
RMS
● Proven PCB Layout
●
Fully Assembled and Tested
319-100210; Rev 0; 6/18
MAX17690EVKITE#
No-Opto Flyback Evaluation Kit
Equipment Setup and Test Procedure
1)
2)
Evaluates: MAX17690 No-Opto Flyback
with Secondary-Side Synchronous
Rectification
Detailed Description
The MAX17690 EV kit provides a proven design to evaluate
the MAX17690, a high-efficiency no-opto DC-DC flyback
controller. The device uses a novel sampling technique to
eliminate the optocoupler/third winding in sensing the output
voltage across the isolation boundary. The MAX17606, a
secondary-side synchronous driver, is used, along with the
MAX17690, to improve the converter efficiency.
This EV kit provides the programmable soft-start feature
to limit the inrush current. The EN/UVLO is used to start
the converter at the desired input voltage. The OVI is used
to turn-off the converter at the desired input overvoltage
level. The MAX17690 provides overcurrent and thermal
protection. The details of soft-start time programming,
programming the output voltage, peak-current-limit setting,
switching frequency setting, and the EN/UVLO, OVI settings
are described in the MAX17690 IC data sheet.
The MAX17606 has provision to program the turn-off trip
point of the secondary synchronous rectifier. An external
resistor (R18) connects the drain of the external MOSFET
to IC’s DRN pin. This resistor sets the turn-off trip point
using the precise internal current source. After the
synchronous rectifier is turned-off to avoid the false
tripping due to DCM ringing, the MAX17606 programs
the minimum turn-off time. The MAX17606 uses the
resistor (R20) connected between TOFF pin to GND0 to
program the minimum turn-off time. For selecting R18,
R20 and other components related to MAX17606, refer
the MAX17606 IC data sheet.
Set the power supply to +24VDC. Disable the power
supply output.
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 electronic load to the VOUT PCB pad and the
negative terminal to the nearest GND0 PCB pad.
Connect the resistive load across the output terminals.
Connect a DMM configured in voltmeter mode across
the VOUT PCB pad and the nearest GND0 PCB pad.
Enable the power supply.
Verify that the output voltmeter displays 3.3V and, if
required, measure the output current using a DMM
programmed in ammeter mode.
If required, vary the input voltage from 18V to 36V,
and the load current from 50mA to 5A. Verify that the
output voltage is 3.3V ±5%.
3)
4)
5)
6)
7)
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MAX17690EVKITE#
No-Opto Flyback Evaluation Kit
EV Kit Performance Report
EFFICIENCY vs. LOAD CURRENT
100
90
80
V
IN
=
18V
toc01
Evaluates: MAX17690 No-Opto Flyback
with Secondary-Side Synchronous
Rectification
OUTPUT VOLTAGE
vs. LOAD CURRENT
3.37
3.36
OUTPUT VOLTAGE (V)
toc02
EFFICIENCY (%)
70
60
50
40
30
20
10
0
0
V
IN
=
36V
V
IN
=
24V
3.35
3.34
3.33
3.32
3.31
V
IN
=
18V
V
IN
=
36V
V
IN
=
24V
1000
2000
3000
4000
5000
0
1000
2000
3000
4000
5000
6000
LOAD CURRENT (mA)
LOAD CURRENT (mA)
LOAD TRANSIENT RESPONSE
(LOAD CURRENT STEPPED
FROM 2.5A TO 5A)
toc03
SOFT-START
toc04
V
OUT (AC-
COUPLED)
200mV/div
V
EN/UVLO
5V/div
V
OUT
2V/div
I
OUT
2A/div
I
OUT
5A/div
1ms/div
10ms/div
Component Suppliers
SUPPLIER
SUMIDA
Murata Americas
Panasonic Corp.
WEBSITE
www.sumida.com
www.murata.com
www.panasonic.com
Ordering Information
PART
MAX17690EVKITE#
#Denotes RoHS compliant.
TYPE
EV Kit
Note:
Indicate that you are using the MAX17690E EV when
contacting these component suppliers.
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MAX17690EVKITE#
No-Opto Flyback Evaluation Kit
MAX17690E EV Kit Bill of Materials
Designation
Qty Description
Evaluates: MAX17690 No-Opto Flyback
with Secondary-Side Synchronous
Rectification
C1
C2, C19, C25
1
3
C4, C16, C17
C5
C6
C7
C8
C9
C10, C11, C20-C23
C12
C13
C14
C15
C24, C26
C27
C28
C30, C31
C32
D1
D2, D4
D3
3
1
1
1
1
1
6
1
1
1
1
2
1
1
2
1
1
2
1
D5
1
47uF±20%, 50V, ALUMINUM-ELECTROLYTIC SMT (CASE_E)
PANASONIC EEE-FK1H470P
4.7uF±10%, 50V, X7R Ceramic capacitor (1210)
KEMET C1210C475K5RAC;
MURATA GRM32ER71H475KA88K
2.2uF±10%, 50V, X7R Ceramic capacitor (0805)
TDK C2012X7R1H225K
6800pF±10%, 100V, X7R Ceramic capacitor (0805)
KEMET C0805C682K1RAC
0.047uF±10%, 16V, X7R Ceramic capacitor (0402)
MURATA GRM155R71C473KA01
0.047uF±10%, 50V, X7R Ceramic capacitor (0402)
MURATA GRM155R71H473KE14
330pF±10%, 50V, X7R Ceramic capacitor (0402)
MURATA GRM155R71H331KA01
220pF±10%, 100V, X7R Ceramic capacitor (0402)
MURATA GRM155R72A221KA01
100uF±20%, 6.3V, X7U Ceramic capacitor (1210)
MURATA GRM32EE70J107ME15L
100pF±10%, 50V, X7R Ceramic capacitor (0402)
PANASONIC ECJ-0EB1H101K
3300pF±10%, 2000V, X7R Ceramic capacitor (1210)
AVX 1210GC332KAT1A
1uF±10%, 50V, X7R Ceramic capacitor (0805)
MURATA GRM21BR71H105KA12
0.01uF±10%, 50V, X7R Ceramic capacitor (0402)
KEMET C0402C103K5RAC
0.1uF±10%, 50V, X7R Ceramic capacitor (0603)
KEMET C0603C104K5RAC
0.47uF±10%, 50V, X7R Ceramic capacitor (0805)
KEMET C0805C474K5RAC
0.022uF±10%, 16V, X7R Ceramic capacitor (0402)
MURATA GRM155R71C223KA01
0.1uF±10%, 16V, X7R Ceramic capacitor (0402)
TDK C1005X7R1C104K050BC
2.2uF±10%, 16V, X7S Ceramic capacitor (0603)
MURATA GRM188C71C225KE11D
100V/2A, (POWERDI-123), DIODE
DIODES INCORPORATED DFLS2100
100V/0.3A, (SOD-123), DIODE
DIODES INCORPORATED 1N4148W-7-F
3.6V/1.5W, (DO-214AC), DIODE, ZNR
CENTRAL SEMICONDUCTOR CMZ5914B
VISHAY BZG05C3V6-M3-08
100V/0.25A, (SOD-323F), DIODE
DIODES INCORPORATED 1N4148WSF
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MAX17690EVKITE#
No-Opto Flyback Evaluation Kit
Evaluates: MAX17690 No-Opto Flyback
with Secondary-Side Synchronous
Rectification
MAX17690E EV Kit Bill of Materials (continued)
Designation
Qty Description
L1
Q1
Q2
R1
R2
R3
R4
R5
R6
1
1
1
1
1
1
1
1
1
10uH±20%, 3.1A inductor
COILCRAFT XAL4040-103ME
150V/16A/40W, 8-PowerWDFN, POWER TRANSISTOR
ON SEMICONDUCTOR FDMC86240
30V/30A/6W, SO-8, POWER TRANSISTOR
VISHAY SILICONIX SI4164DY-T1-GE3
20kΩ±1% resistor, 0402
VISHAY DALE CRCW040220K0FKEDC
619kΩ±1% resistor, 0402
PANASONIC ERJ-2RKF6193X
27.4kΩ±1% resistor, 0402
VISHAY DALE CRCW040227K4FKED
158kΩ±1% resistor, 0402
PANASONIC ERJ-2RKF1583X
10kΩ±1% resistor, 0402
VISHAY DALE CRCW040210K0FK
121kΩ±1% resistor, 0402
PANASONIC ERJ-2RKF1213
17.8kΩ±1% resistor, 2010
PANASONIC ERJ-12SF1782
118kΩ±1% resistor, 0402
PANASONIC ERJ-2RKF1183
24.9kΩ±1% resistor, 0402
VISHAY DALE CRCW040224K9FKEDC
4.87kΩ±1% resistor, 0402
VISHAY DALE CRCW04024K87FK
47Ω±1% resistor, 1210
VISHAY DRALORIC CRCW121047R0JNEAHP
0.012Ω±1% resistor, 1206
PANASONIC ERJ-8CWFR012V
OPEN
0Ω resistor, 0402
PANASONIC ERJ-2GE0R00X
1kΩ±1% resistor, 0402
VISHAY DALE CRCW04021K00FK
4.99Ω±1% resistor, 0402
VISHAY DALE CRCW04024R99FKED
10Ω±1% resistor, 0402
VISHAY DALE CRCW040210R0FK
1kΩ±1% resistor, 0402
PANASONIC ERJ-2RKF1001X
75kΩ±1% resistor, 0402
VISHAY DALE CRCW040275K0FK
10-pin SMT, 8.2uH, 8A, (3-5):(9,10-6,7) = 1:0.2
SUMIDA CEP1311F_13324-T204
MAX17690, TQFN16-EP, NO-OPTO ISOLATED FLYBACK CONTORLLER IC
MAXIM MAX17690ATE+
MAX17606, TSOT23-6, SECONDARY-SIDE SYNCHRONOUS MOSFET DRIVER FOR FLYBACK CONVERTER
MAXIM MAX17606AZT+
R7
R8
R9
R10
R11
R12
R13, R19
R14, R22
R15
R16, R21
R17
R18
R20
T1
U1
U2
1
1
1
1
1
1
2
2
1
2
1
1
1
1
1
1
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