ALQ25B50_03 Datasheet, PDF (6/11 Pages) Astec America, Inc – Industry Standard ¼ Brick: 300W DC Transformer

Technical Reference Notes
ALQ25B50 Bus Converter
DC Transformer
Electrical Specifications (continued)
TO OSCILLOSCOPE
BATTERY
Ltest
Vi(+)
12 uH
Cs 220 uF
ESR < 0.1 OHM
@ 20 ºC, 100 kHz
23230uFF
ESESRR<<00..17 OOHHMM
@ 20 ºC, 100 kHz
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
0.1 uF
10 uF ^SCOPE
RESISTIVE
LOAD
Note:
Use a 0.1µF 50V X7R ceramic capacitor and a 10µF 25V tantalum cap.
Scope measurement should be made using a BNC probe socket. Position
the load between 51 mm and 76 mm (2 in. and 3 in.) from module the
latter.
Figure 2. Peak to Peak Output Noise Measurement Setup.
MODEL: ALQ25B50 SERIES
SEPTEMBER 11, 2003 - REVISION A (PRELIMINARY)
SHEET 6 OF 11