KX-NS8290CE - Panasonic PBX Service Manual (repair manual). Page 51

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51
KX-NS8290
11.5.3. DC-DC Converter (3.3V) Waveform
11.5.4. DC-DC Converter (1.1V) Waveform
Description: 3.3V power circuit FET gate control signal at PoE operation mode
Ch1: FET_GATE(IC650-4)-DG
Description: 3.3V power circuit FET gate control signal at AC-Adaptor
                    operation mode
Ch1: FET_GATE(IC650-4)-DG
Description: 3.3V power circuit feedback voltage waveform
Ch1: FB(IC650-3)-DG
20
19
21
PWM control  
interval  
300 kHz  
11.5V 
PWM control
interval
300 kHz 
8.85V 
Feedback Voltage = About 1V  
Description: 1.1V power circuit feedback voltage waveform
Ch1: FB(IC102-5)-DG
22
Feedback Voltage= About 0.8V
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