Technical Reference Notes
AEQ75Y48 Series
(Single Output Quarter 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
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.
COPPER STRIP
Vo(+)
RESISTIVE
LOAD
SCOPE
1 uF
10 uF
Vo(-)
Note: Use a 1mF 50V X7R ceramic capacitor and a 10mF 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: AEQ75Y48 SERIES
JULY 21, 2005 - REVISION 01
SHEET 6 OF 12
ASTEC [ Astec America, Inc ]
