Tyco Electronics Corp.

7

Advance Data Sheet

March 1999

36 Vdc to 75 Vdc Inputs; 25 W

LW025 Single-Output-Series Power Modules:

8-1263(C).e

Figure 9. LW025A, F Typical Output Voltage Start-

Up when Signal Is Applied to Remote

On/Off

TIME, t (1 ms/div)

0

5V

0

Test Configurations

8-203(C)

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 10. Input Reflected-Ripple Test Setup

8-513(C)

Note: Use a 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 11. 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 12. Output Voltage and Efficiency

Measurement Test Setup

TO OSCILLOSCOPE

12 µH

IMPEDANCE < 0.1

Ω

@ 20 ˚C, 100 kHz

BATTERY

33 µF

CURRENT

PROBE

0.1 µF

RESISTIVE

LOAD

SCOPE

COPPER STRIP

SUPPLY

CONTACT RESISTANCE

CONTACT AND

DISTRIBUTION LOSSES

LOAD

η

–

–

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