13-Apr-2006

EP-86 – 6.6 W, 3.3 V, 2 A PoE Powered Device

Page 21 of 28

Power Integrations

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

www.powerint.com

10.3 Load Transient Response (75% to 100% Load Step)

In the figures shown below, signal averaging was used to better enable viewing of the

load transient response.

The oscilloscope was triggered using the load current

step as a trigger source. Since the output switching is random with respect

to the load transient, contributions to the output ripple from these sources will

average out, leaving the contribution only from the load step response.

Figure 20

– Transient Response,

36 VDC, 75-100-75% Load Step.

Upper: Load Current, 1 A / div.

Lower: Output Voltage,

20 mV, 500

µs / div.

Figure 21

– Transient Response,

57 VDC, 75-100-75% Load Step.

Upper: Load Current, 1 A / div.

Lower: Output Voltage,

20 mV, 500

µs / div.