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General Description

The MAX17497A evaluation kit (EV kit) demonstrates

the MAX17497A controller IC offline AC-DC flyback

converter design and features an integrated step-down

regulator. The EV kit circuit uses the MAX17497AATE

current-mode fixed-frequency flyback converter in a

16-pin TQFN package with an exposed pad.

The EV kit demonstrates the IC’s cycle-by-cycle current

limit, soft-start, and UVLO features optimized for univer-

sal offline applications (+85V AC to +265V AC). The EV

kit circuit is configured for output voltages of +12V and

+3.3V and provides up to 300mA and 600mA of current

from the respective outputs.

The transformer secondary +12V output is used as the

input source for the IC step-down regulator that provides

+3.3V at VOUT2.

Warning: The EV kit is designed to operate with high

voltages. Dangerous voltages are present on this EV kit

and on equipment connected to it. Users who power up

this EV kit or power the sources connected to it must

be careful to follow safety procedures appropriate to

working with high-voltage electrical equipment.

Under severe fault or failure conditions, this EV kit may

dissipate large amounts of power, which could result in

the mechanical ejection of a component or of component

debris at high velocity. Operate this kit with care to avoid

possible personal injury.

Features

S +85V AC to +265V AC Input Voltage Range

S Dual Voltage Output

 +12V Provides Up to 300mA (VOUT1)

 +3.3V Provides Up to 600mA (VOUT2)

S 250kHz Switching Frequency

S RESETN Open-Drain Output

S Undervoltage Lockout (UVLO)

S Low-Cost Flyback Design

S Proven PCB Layout

S Fully Assembled and Tested

DESIGNATION QTY DESCRIPTION

C1, C12 2

0.1FF Q10%, 630V film

capacitors

Panasonic ECQ-E6104KF

C2, C3 2

100FF, 400V electrolytic

capacitors (25mm x 25mm)

Panasonic ECO-S2GP101CA

C4 1

2.2FF Q10%, 50V X7R

ceramic capacitor (1206)

Murata GRM31CR71H225K

C5 1

0.47FF Q10%, 50V X7R

ceramic capacitor (0805)

Murata GRM21BR71H474K

C6 1

0.047FF Q10%, 50V X7R

ceramic capacitor (0603)

Murata GRM188R71H473K

DESIGNATION QTY DESCRIPTION

C7 1

2.2FF Q10%, 16V X7R

ceramic capacitor (0805)

Murata GRM21BR71C225K

C8 1

330pF Q20%, 100V X7R

ceramic capacitor (0603)

Murata GRM188R72A331M

C9 1

0.022FF Q10%, 25V X7R

ceramic capacitor (0603)

Murata GRM188R71E223K

C10 1

0.1FF Q10%, 50V X7R

ceramic capacitor (0603)

Murata GRM188R71H104K

C11 1

10FF Q10%, 16V X7R

ceramic capacitor (1206)

Murata GRM31CR71C106K

MAX17497A Evaluation Kit

Evaluates: MAX17497A

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.

19-6357; Rev 1; 11/12

Ordering Information appears at end of data sheet.

Component List

Summary of content (8 pages)

PAGE 1
MAX17497A Evaluation Kit Evaluates: MAX17497A General Description Features The MAX17497A evaluation kit (EV kit) demonstrates the MAX17497A controller IC offline AC-DC flyback converter design and features an integrated step-down regulator. The EV kit circuit uses the MAX17497AATE current-mode fixed-frequency flyback converter in a 16-pin TQFN package with an exposed pad.
PAGE 2
MAX17497A Evaluation Kit Evaluates: MAX17497A Component List (continued) DESIGNATION QTY C13 1 22FF Q10%, 25V X7R ceramic capacitor (1210) Murata GRM32ER71E226K C14 0 Not installed, ceramic capacitor (1210) C15 1 10FF Q10%, 25V X7R ceramic capacitor (1206) Murata GRM31CR71E106K D1 D2 D3 DESCRIPTION 1 1000V, 1A diode (41 DO1) Fairchild 1N4007 1 100V, 300mA diode (SOD123) Diodes Inc.
PAGE 3
MAX17497A Evaluation Kit Evaluates: MAX17497A Quick Start Required Equipment • MAX17497A EV kit • AC source (+85V AC to +265V AC) • Three voltmeters • 300mA load • 600mA load Procedure The EV kit is fully assembled and tested. Follow the steps below to verify board operation. Warning: Exercise caution when connecting and measuring offline voltages. 1) Connect the first voltmeter to the VOUT1 and PGND PCB pads. 2) Connect the second voltmeter to the VOUT2 and PGND PCB pads.
PAGE 4
MAX17497A Evaluation Kit Evaluates: MAX17497A Current Limiting The IC features current limiting for the transformer’s primary side by monitoring the peak current entering the IC LXF input. Resistor R15 sets the EV kit circuit current limit to 548mA. The IC turns off switching MOSFET N1 when the peak current at the LXF pin reaches the current limit.
PAGE 5
MAX17497A Evaluation Kit Evaluates: MAX17497A Figure 1.
PAGE 6
MAX17497A Evaluation Kit Evaluates: MAX17497A 1.0’’ Figure 2. MAX17497A EV Kit Component Placement Guide— Component Side 1.0’’ Figure 3. MAX17497A EV Kit PCB Layout—Component Side Maxim Integrated 1.0’’ Figure 4. MAX17497A EV Kit PCB Layout—Solder Side 1.0’’ Figure 5.
PAGE 7
MAX17497A Evaluation Kit Evaluates: MAX17497A Ordering Information PART TYPE MAX17497AEVKIT# EV Kit #Denotes RoHS compliant.
PAGE 8
MAX17497A Evaluation Kit Evaluates: MAX17497A Revision History REVISION NUMBER REVISION DATE DESCRIPTION 0 5/12 Initial release 1 11/12 Revised Component List, EV kit specifications, and Figure 1 PAGES CHANGED — 1–6 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.