Technical Reference Notes
AEO_ALO04/12/20/25x48 Series
(Single Output 8th Brick)
Electrical Specifications (continued)
TO OSCILLOSCOPE
Vi(+)
Vi(-)
Ltest
12 uH
Cs 220 uF
33 uF
ESR < 0.7 OHM
@ 20 ºC, 100 kHz
BATTERY
ESR < 0.1 OHM
@ 20 ºC, 100 kHz
Measure input reflected-ripple current with a simulated source inductance (Ltest) of
12uH. Capacitor Cs offsets possible battery impedance. Measure current as shown
above.
Figure 1. Input Reflected Ripple Current Measurement Setup.
COPPER STRIP
Vo(+)
RESISTIVE
0.1 uF
10 uF
SCOPE
LOAD
Vo(-)
Use a 0.1µF @50V X7R ceramic capacitor (connected an inch away from the output
terminals of the UUT) and a 10µF @ 25V tantalum capacitor (2 inches away from
the output terminals of the UUT). Scope measurement should be made using a BNC
socket, positioned 3 inches away from output terminals of the converter.
Figure 2. Peak to Peak Output Noise Measurement Setup.
MODEL: AEO_ALO04/12/20/25x48 SERIES
AUGUST 25, 2005 - REVISION G
SHEET 6 OF 26
ASTEC [ Astec America, Inc ]
