EPR-32 Datasheet, PDF (29/36 Pages) Power Integrations, Inc. – Engineering Prototype Report for EP-32 − TOPSwitch-GX 25 W Multiple Output DVD, Set-top Box Power Supply Using TOP245P

13-Jul-06
12.5 230 VAC 50% Load
EPR-32 - 25 W Multiple Output TOP245P Supply
Figure 30 − Gain-Phase Plot, 230 VAC, Maximum Steady State Load.
Vertical Scale: Gain = 10 dB/div, Phase = 30°/div.
Crossover Frequency = 17 kHz, Phase Margin = 62°.
12.6 230 VAC Minimum Load
Figure 31 − Gain-Phase Plot, 230 VAC, Maximum Steady State Load.
Vertical Scale: Gain = 10 dB/div, Phase = 30°/div.
Crossover Frequency = 8 kHz, Phase Margin = 70°.
These results show that the X pin current mode control provides excellent bandwidth and
phase margin at gain cross-over under all operating conditions.
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