Technical Reference Notes
ALD12/18/20/25 Series
(Single Output 16
th
Brick)
MODEL: ALD12/ 18/20/ 25 SERIES SHEET 5 OF 20
AUGUST 17, 2005 – REVISION C
Electrical Specifications (continued)
SAFETY AGENCY / MATERIAL RATING / ISOLATION
Parameter Device
Safety Approval All UL/cUL 60950
TUV EN 60950
Material Flammability Rating All UL94V-0
Parameter Device Symbol Min Typical Max Unit
Input to Output Capacitance All - 1000 - pF
Input to output Resistance All - 10 - Mohms
Input to Output Insulation Type All - Basic - -
Fi
ure 2. Peak to Peak Out
ut Noise Measurement Setu
.
Figure 1. Input Reflected Ripple Current Measurement Setup.
Vo(+)
Vo(-)
RESISTIVE
LOAD
10 uF0.1 uF
SCOPE
COPPER STRIP
Use a 0.1
F @50V X7R ceramic capacitor (connected an inch away from the output
terminals of the UUT) and a 10µF @ 25V tantalu m capacitor (2 inch es away fro m the outpu t
terminals of the UUT). Scope measurement should be made using a BNC socket, positioned 3
inches away from output terminals of the converter.
BATTERY
Cs 220 uF
ESR < 0.1 OHM
@ 20 ºC, 100 kHz
Ltest
12 uH
33 uF
ESR < 0.7 OHM
@ 20 ºC, 100 kHz
Vi(+)
Vi(-)
TO OSCILLOSCOPE
Measure input reflected-ripple current with a simulated source inductance (Ltest) of 12 uH.
Capacitor Cs offsets possible battery impedance. Measure current as shown above.
