DER-96

10 W VoIP

September 12, 2005

Page 27 of 33

CONFIDENTIAL

Power Integrations

Tel: +1 408 414 9200 Fax: +1 408 414 9201

www.powerint.com

11.3 Output Ripple Voltage

It can be seen from the waveforms below that the power supply comfortably meets the

output ripple specifications. This is possible even without the need for an output inductor.

Measurements made with 0.1 uF ceramic capacitor in parallel with a 1 uF / 50 V

electrolytic capacitor, and also made using very short lead length connections to the

output pins of the power supply.

Figure 18

3.3 V Output Ripple, 50 mV,

2

µs / div

Figure 19 – 48 VDC, Full Load

5V Output Ripple, 50 mV,

2

µs / div

Figure 20

12 V Output Ripple, 50 mV,

2

µs / div