Technical Reference Notes

ALQ40/50 Series

(Open Frame Single Output Quarter Brick)

MODEL: ALQ50 SERIES

SHEET 7 OF 16

APRIL 21, 2003 - REVISION A (PRELIMINARY)

Electrical Specifications (continued)

Figure 2. Peak to Peak Output Noise Measurement Setup.

Figure 1. Input Reflected Ripple Current Measurement Setup.

Vo(+)

Vo(-)

RESISTIVE

LOAD

10 uF

1 uF

SCOPE

COPPER STRIP

Note:

Use a 1

µF 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.

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

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.