USEFUL NOTES

• Innefficient, DC flux component
• Use generally for 0.5 watt or less

Without Capacitor

• VAC = 2.2 x ( VDC +1 )
• IAC = 1.6 x IDC
• WATTS = VDC x IDC (output)
• VA = 3.5 x ( WATTS + IDC)

 With capacitor

• VAC = 0.88 x ( VDC +1 )
• IAC = 2.6 x IDC
• WATTS = VDC x IDC (output)
• VA = 2.3 x ( WATTS + IDC)

• More efficient, although secondary not fully utilized
• Preffered in very low voltage supplies where extra diode voltage drops unwanted

Without Capacitor

• VAC = 2.2 x ( VDC +1 )
• IAC = 0.8 x IDC
• WATTS = VDC x IDC (output)
• VA = 1.4 x ( WATTS + IDC)
• With capacitor
• VAC = 1.7 x ( VDC +1 )
• IAC =0.8 X IDC
• WATTS = VDC x IDC
• VVA = 1.4 x ( WATTS + IDC)

• Most efficient, secondary is fully utilized
• Preffered for smallest transformer size and cost at higher voltages

Without capacitor

• VAC = 1.1 x ( VDC +2 )
• IAC = 1.1 x IDC
• WATTS = VDC x IDC (output)
• VA = 1.2 x ( WATTS + 2XIDC)
• With capacitor
• VAC = 0.8 x ( VDC + 2 )
• IAC =1.8 X IDC
• WATTS = VDC x IDC (output)
• VA = 1.4 x ( WATTS + 2XIDC)

• Most efficient, when load is balanced
• Provides (+) and (-) with a common ground

Without capacitor

• VAC = 1.1 x ( VDC +2 )
• IAC = 1.1 x IDC
• WATTS = VDC x IDC (output)
• VA = 1.2 x ( WATTS + 2XIDC)

With capacitor

• VAC = 0.8 x ( VDC + 2 )
• IAC =1.8 X IDC
• WATTS = VDC x IDC (output)
• VA = 1.4 x ( WATTS + 2 IDC)

• VDC= (VOUT + VREG + VRIPPLE ) x VNOMINAL LINE / VLOW LINE ;
• Usually VREG >= 3 V, VRIPPLE = 10% x VDC