Data Sheet

January 2002

Power Modules: 36 Vdc to 75 Vdc Input; 10 W

SMLW010 Single-Output Low-Profile

6

Tyco Electronics Corp.

Test Configurations

8-203

Note: Input reflected-ripple current is measured with a simulated

source impedance of 12 µH. Capacitor Cs offsets possible

battery impedance. Current is measured at the input of the

module.

Figure 1. Input Reflected-Ripple Test Setup

8-513

Note: Use one 0.1 µF ceramic capacitor. Scope measurement should

be made using a BNC socket. Position the load between 50

mm and 75 mm (2 in. and 3 in.) from the module.

Figure 2. Peak-to-Peak Output Noise Measurement

Test Setup

8-204(C)

Note: All measurements are taken at the module terminals. When

socketing, place Kelvin connections at module terminals to

avoid measurement errors due to socket contact resistance.

Figure 3. Output Voltage and Efficiency

Measurement Test Setup

Design Considerations

Input Source Impedance

The power module should be connected to a low

ac-impedance input source. Highly inductive source

impedances can affect the stability of the power mod-

ule. If the source inductance exceeds 10 µH, a 33 µF

electrolytic capacitor (ESR < 0.7

Ω at 100 kHz)

mounted close to the power module helps ensure

stability of the unit. (See Figure 1.)

Solder Recommendations

Large surface-mount components typically require a

thicker stencil than smaller components to ensure a

reliable solder joint. The SMLW010 Single-Output,

Low-Profile, PCB Mount Power Modules have been

evaluated for solder joint reliability and shock and vibra-

of solder. This volume can be obtained by printing sol-

der 12 mils thick on the copper pads or overprinting the

copper pads 13 mils (0.33 mm) around the pad area

with 8 mils of printed solder. Although this volume is

recommended, tests have been conducted using lower

volumes with successful results. Contact technical sup-

port for further assistance.

TO OSCILLOSCOPE

12 µH

IMPEDANCE < 0.1

Ω

@ 20 ˚C, 100 kHz

BATTERY

33 µF

CURRENT

PROBE

RESISTIVE

LOAD

SCOPE

0.1 µF

COPPER STRIP

SUPPLY

CONTACT RESISTANCE

CONTACT AND

DISTRIBUTION LOSSES

LOAD

η

–

–

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