ALQ25_03 Datasheet, PDF (7/15 Pages) Astec America, Inc – Single Output Open-Frame DC-DC Converter Module Industry Standard ¼ Brick: 36V-75V Input / 5V Output

Technical Reference Notes
ALQ25 Series
(Open Frame Single Output Quarter Brick)
TO OSCILLOSCOPE
BATTERY
Ltest
12 uH
Cs 220 uF
ESR < 0.1 OHM
@ 20 ºC, 100 kHz
33 uF
ESR < 0.7 OHM
@ 20 ºC, 100 kHz
Vi(+)
Vi(-)
Note: Measure the input reflected ripple current with a simulated source
inductance (Ltest) of 12uH. Capacitor Cs offsets possible battery/
source impedance. Measure current as shown above.
Figure 1. Input Reflected Ripple Current Measurement Setup.
Vo(+)
Vo(-)
COPPER STRIP
1 uF
10 uF ^SCOPE
RESISTIVE
LOAD
Note:
Use a 1µF 50V X7R ceramic capacitor and a 10µF 25V tantalum cap.
Scope measurement should be made using a BNC probe socket positioned
about 76mm (3 in.) away from the module’s output terminals. The ext.
capacitors should be placed between the BNC socket and the module’s
output terminals, with a minimum distance of 51mm (2in.) from the latter.
Figure 2. Peak to Peak Output Noise Measurement Setup.
MODEL: ALQ25 SERIES
Dec 1, 2003 - REVISION B
SHEET 7 OF 15