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Power Supply Topologies Type of Converter
BUCK
BUCK BOOST (Inverting)
BOOST
SEPIC
FLYBACK
FORWARD
2 SWITCH FORWARD
ACTIVE CLAMP FORWARD
HALF BRIDGE
PUSH PULL
FULL BRIDGE
PHASE SHIFT ZVT
Equations and Waveforms for Discontinuous Mode L
D1 D1
L
Q1
Circuit Configuration
L1
L D1
D1
CO
D1
Q1
CO
Q1
Q1
CO
L
NP LP
CO
L2
D4
Q2
CO
NS
NS
NP
Q1
C1
CO
D2
NP
NS
CO
D2
D2
C2
L
D1
Q2
NP
CO
NS
Q3
D1
Q2
L
L1
Q2
Q3 CO
CO
NS
CO
CO
D1
NP
NP
NS
Q1
Q1
D3
NS
NP Q2
Q1
D3
L
D1
L
D1
D1
C
D1
L
Q1
C1
NS
D2 Q4
D2
Q2
Q1
D2
D2
Q1
Q1
Q4
L2
Q
( )
(
)
(
( )
) ( )
Ideal Transfer Function*
VOUT tON = =D VIN TP
Drain Current*
IQ1 (max) = IOUT
Drain Voltage*
VDS = VIN
VDS = VOUT
VDS = VIN - VOUT
VDS = VIN + VOUT
ID1 = IOUT x (1-D)
ID1 = IOUT
ID1 = IOUT
ID1 = IOUT
VD1 = VIN
VD1 = VOUT
VD1 = VIN - VOUT
VD1 = VOUT + VIN
Average Diode Current* Diode Reverse Voltage*
Voltage and Current Waveforms
** Go to: power.ti.com and place literature number in the “Key Word” box. For SEM topics, go to:
power.ti.com/seminars
IQ1 (max) = IOUT x
( ) 1 1-D
VOUT tON D ==TP - tON 1-D VIN
IQ1 (max) = IOUT x
VOUT D = 1-D VIN
( ) 1 1-D
IQ1 (max) = IOUT x
TP x VOUT 2 x IOUT x LP
VOUT = Dx VIN
( ) D 1-D
IQ1 (max) =
(
VIN x tON LP
VDS = VIN + VOUT x
( )( ) ( )
t VOUT NS x ON = NP TP VIN
)
IQ1 (max) =
( ) NP NS
ID1 = IOUT
VD1 = VOUT+ VIN x
( ) NS NP
=
NS xD NP
( )
NS x IOUT NP
( )( )( )
t VOUT NS N x ON = S x D = NP TP NP VIN
IQ1 (max) =
( )
NS x IOUT NP
VDS = 2 x VIN
VDS = VIN
ID1 = IOUT x D
ID1 = IOUT x D
VD1 = VOUT + VIN x
( ) NS NP
( )( )( )
t VOUT NS N x ON = S x D = NP TP NP VIN
VD1 = VOUT + VIN x
IQ1 (max) =
( )
NS x IOUT NP
VDS = VIN x
1 1-D
NS NP
VD1 = VOUT + VIN x
( )( ) ( )
VOUT N t N = 2 x S x ON = 2 x S x D NP T P NP VIN
( )
NS x IOUT NP
IQ1 (max) =
( )
ID1 = IOUT x D
( )
( )( )( )
VOUT NS tON N = x = S xD NP TP NP VIN
VDS = VIN
(
)
ID1 = IOUT x D +
( )( ) NS 1 x NP 1-D
(
( ) NS NP
PWM
)
ID1 = IOUT x D +
VD1 = VIN x
IOUT x (1-2 D) 2
( )( ) ( )
VOUT N t N = 2 x S x ON = 2 x S x D NP TP NP VIN
( )
NS x IOUT NP
IQ1 (max) =
VDS = 2 x VIN
IOUT x (1-2 D) 2
VD1 = VIN x
( )
NS x IOUT NP
IQ1 (max) =
( )( ) ( )
VOUT N t N = 2 x S x ON = 2 x S x D NP TP NP VIN
IQ1 (max) =
VDS = VIN
(
)
ID1 = IOUT x D +
( )
NS x2 NP
VD1 = VIN x
IOUT x (1-2 D) 2
ID1 =
( )
NS x2 NP
PWM
PWM
VIN VDS(Q1)
VIN VDS(Q1)
VIN
VIN VDS(Q1)
VIN
VIN
VIN
VIN
VIN
VIN
VIN
VIN
VDS(Q1)
VDS(Q1)
VDS(Q1)
VDS(Q1)
VDS(Q1)
VDS(Q1)
VDS(Q1)
VDS(Q1)
VDS(Q1)
IQ1
IQ1
IQ1
IQ1
IQ1
IQ1
IQ1
IQ1
IQ1
IQ2
IQ1
IQ2
IQ1
IQ2
IQ1
ID1
ID1
ID1
ID1
ID1
ID1
ID1
ID1
ID1
ID2
ID1
ID2
ID1
ID2
ID1
IL
IL
IL
IL
IL
IL
IL
IL
IL
IL
IL
IL
V
V
V
V
VS
VS
VS
VS
VS
VS
VS
VS
TP
Application Notes:** Understanding Buck Power Stages in Switchmode Power Supplies (SLVA057) Under the Hood of Low Voltage DC/DCConverters (SLUP206) Controllers/Converters: TPS40020/21 TPS40007/09 TPS40040/41 TPS40075 TPS40077 TPS40140 TPS40180 TPS40192/3 TPS40200 TPS5410/20/30/50 TPS54350/550 TPS62110
The platform bar is a trademark of Texas Instruments. © 2010 Texas Instruments Incorporated. Printed in the U.S.A.
Printed on recycled paper.
tON
TP
Application Notes:** Understanding Boost Power Stages in Switchmode Power Supplies (SLVA061) High Voltage Power Supply Using a Highly Integrated DC/DC Converter (SLVA137) Under the hood of a Boost Converter (SEM1800 Topic 3) Controllers/Converters: TPS40210/11 UCC38050/51 (PFC) TPS61080 UCC3817A/18A (PFC) TPS61030 UCC3809-1 TPS61100 TPS61200 UCC28019A UCC28060 (PFC) UCC28061 UCC28070 UCC28220/21 UCC38C42 UCC3800
tON
TP
Application Notes:** Understanding Buck-Boost Power Stages in Switchmode Power Supplies (SLVA059A) Controllers/Converters: TPS40200 TPS40061 TPS40057 TPS5410/20/30/50 TPS54350/54550 TPS63700 UC3572 UCC3801/01/02/03/04/05 UCC3807 UCC3810 (Dual) UCC3813 UCC38C40/41/42/43/45
tON
TP
Application Notes:** Versatile Low Power SEPIC Converter Accepts Wide Input Voltage Range (SLUA158) High Power Factor Preregulator Using the SEPIC Converter (SLUP103) Controllers/Converters: TPS43000 TPS61130 UCC38C40/41/42/43/44/45 UCC3800/01/02/03/04/05/3813 UCC3807 UCC3810 (Dual)
tON
TP
Application Notes:** Design of Flyback Transformers and Inductors (SLUP076) Switching Power Supply Design Review – 60 Watt Flyback Regulator (SLUP072) Controllers: TPS23750/70 (PoE) UCC3807 UCC28220/21 UCC28600 (Green Mode) UCC28610 UCC35701/702 UCC35705/706 UCC3800/01/02/03/04/05/3813 UCC3809 UCC3810 (Dual) UCC38C40/41/42/43/44/45
PWM
tON
tON
TP
Application Notes:** 25-W Forward Converter Design Review Controllers: UCC28220/21 UCC35701/702 UCC35705/706 UCC3800/01/02/03/04/05/3813 UCC3807 UCC3809 UCC3810 (Dual) UCC38C40/41/42/43/44/45
(SLUA276)
TP
Application Notes:** Practical Considerations in Current Mode Power Supplies (SLUA110) Controllers: UCC27200/01 (MOSFET Driver) UCC28220/21 UCC35701/702 UCC35705/706 UCC3801/04/05/13 UCC3807 UCC3809 UCC3810 (Dual) UCC38C41/44/45
tON
PWM
tON TP
Application Notes:** Active Clamp and Reset Technique Enhances Forward Converter Performance (SLUP108) Design Considerations for Active Clamp and Reset Technique (SLUP112) Understanding and Deg an Active Clamp Current Mode Controlled Converter (SLUA535) Controllers: UCC2891, 2 ,3 ,4, 7 UCC2897A UCC3580-1 UC3824
TP
Application Notes:** Practical Considerations in Current Mode Power Supplies (SLUA110) Zero Voltage Switching Resonant Power Conversion (SLUA159) Controllers: UC28025 UC3825A, B UCC25600 UCC27200/01 (MOSFET Driver) UCC28089 (2 x 50%) UCC28250 UCC3806 UCC3808A UCC38083/84/85/86
PWM
tON
TP
Application Notes:** 1.5 MHz Current Mode IC Controlled 50-Watt Power Supply (SLUA053) The UC3823A,B and UC3825A,B Enhanced Generation of PWM Controllers (SLUA125) Controllers: UC28025 UC3825A, B UCC28089 (2 x 50%) UCC28250 UCC3806 UCC3808A UCC38083/84/85/86
1 x IOUT 2
( ) NS NP
PWM
PWM
PWM
NS x IOUT NP
VD1 = VIN x
PWM
PWM
( )
VDS = VIN
PWM
tON
* Excludes ripple current and output diode voltage drop. Continuous conduction mode shown (unless otherwise noted). For reliable operation follow recommendations in datasheets and application notes.
VOUT TP 1 = = TP-tON (1-D) VIN
tON
IQ2
ID2
IL2
tON TP
TP
Application Notes:** The UC3823A,B and UC3825A,B Enhanced Generation of PWM Controllers (SLUA125) Practical Considerations in Current Mode Power Supplies (SLUA110) Controllers: UC28025 UCC27200/01 (MOSFET Driver) UCC28089 (2 x 50%) UCC28230/1 UCC3806 UCC3808A UCC38083/84/85/86 UC3825A, B
Application Notes:** Design Review: 500-W, 40-W/in3 Phase Shifted ZVT Power Converter (SLUP102) Phase Shifted, Zero Voltage Transition Design Considerations (SLUA107) Controllers: UCC28950 UC3875 UC3879 UCC3895
SLUW001E
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BUCK
BUCK BOOST (Inverting)
BOOST
SEPIC
FLYBACK
FORWARD
2 SWITCH FORWARD
ACTIVE CLAMP FORWARD
HALF BRIDGE
PUSH PULL
FULL BRIDGE
PHASE SHIFT ZVT
Equations and Waveforms for Discontinuous Mode L
D1 D1
L
Q1
Circuit Configuration
L1
L D1
D1
CO
D1
Q1
CO
Q1
Q1
CO
L
NP LP
CO
L2
D4
Q2
CO
NS
NS
NP
Q1
C1
CO
D2
NP
NS
CO
D2
D2
C2
L
D1
Q2
NP
CO
NS
Q3
D1
Q2
L
L1
Q2
Q3 CO
CO
NS
CO
CO
D1
NP
NP
NS
Q1
Q1
D3
NS
NP Q2
Q1
D3
L
D1
L
D1
D1
C
D1
L
Q1
C1
NS
D2 Q4
D2
Q2
Q1
D2
D2
Q1
Q1
Q4
L2
Q
( )
(
)
(
( )
) ( )
Ideal Transfer Function*
VOUT tON = =D VIN TP
Drain Current*
IQ1 (max) = IOUT
Drain Voltage*
VDS = VIN
VDS = VOUT
VDS = VIN - VOUT
VDS = VIN + VOUT
ID1 = IOUT x (1-D)
ID1 = IOUT
ID1 = IOUT
ID1 = IOUT
VD1 = VIN
VD1 = VOUT
VD1 = VIN - VOUT
VD1 = VOUT + VIN
Average Diode Current* Diode Reverse Voltage*
Voltage and Current Waveforms
** Go to: power.ti.com and place literature number in the “Key Word” box. For SEM topics, go to:
power.ti.com/seminars
IQ1 (max) = IOUT x
( ) 1 1-D
VOUT tON D ==TP - tON 1-D VIN
IQ1 (max) = IOUT x
VOUT D = 1-D VIN
( ) 1 1-D
IQ1 (max) = IOUT x
TP x VOUT 2 x IOUT x LP
VOUT = Dx VIN
( ) D 1-D
IQ1 (max) =
(
VIN x tON LP
VDS = VIN + VOUT x
( )( ) ( )
t VOUT NS x ON = NP TP VIN
)
IQ1 (max) =
( ) NP NS
ID1 = IOUT
VD1 = VOUT+ VIN x
( ) NS NP
=
NS xD NP
( )
NS x IOUT NP
( )( )( )
t VOUT NS N x ON = S x D = NP TP NP VIN
IQ1 (max) =
( )
NS x IOUT NP
VDS = 2 x VIN
VDS = VIN
ID1 = IOUT x D
ID1 = IOUT x D
VD1 = VOUT + VIN x
( ) NS NP
( )( )( )
t VOUT NS N x ON = S x D = NP TP NP VIN
VD1 = VOUT + VIN x
IQ1 (max) =
( )
NS x IOUT NP
VDS = VIN x
1 1-D
NS NP
VD1 = VOUT + VIN x
( )( ) ( )
VOUT N t N = 2 x S x ON = 2 x S x D NP T P NP VIN
( )
NS x IOUT NP
IQ1 (max) =
( )
ID1 = IOUT x D
( )
( )( )( )
VOUT NS tON N = x = S xD NP TP NP VIN
VDS = VIN
(
)
ID1 = IOUT x D +
( )( ) NS 1 x NP 1-D
(
( ) NS NP
PWM
)
ID1 = IOUT x D +
VD1 = VIN x
IOUT x (1-2 D) 2
( )( ) ( )
VOUT N t N = 2 x S x ON = 2 x S x D NP TP NP VIN
( )
NS x IOUT NP
IQ1 (max) =
VDS = 2 x VIN
IOUT x (1-2 D) 2
VD1 = VIN x
( )
NS x IOUT NP
IQ1 (max) =
( )( ) ( )
VOUT N t N = 2 x S x ON = 2 x S x D NP TP NP VIN
IQ1 (max) =
VDS = VIN
(
)
ID1 = IOUT x D +
( )
NS x2 NP
VD1 = VIN x
IOUT x (1-2 D) 2
ID1 =
( )
NS x2 NP
PWM
PWM
VIN VDS(Q1)
VIN VDS(Q1)
VIN
VIN VDS(Q1)
VIN
VIN
VIN
VIN
VIN
VIN
VIN
VIN
VDS(Q1)
VDS(Q1)
VDS(Q1)
VDS(Q1)
VDS(Q1)
VDS(Q1)
VDS(Q1)
VDS(Q1)
VDS(Q1)
IQ1
IQ1
IQ1
IQ1
IQ1
IQ1
IQ1
IQ1
IQ1
IQ2
IQ1
IQ2
IQ1
IQ2
IQ1
ID1
ID1
ID1
ID1
ID1
ID1
ID1
ID1
ID1
ID2
ID1
ID2
ID1
ID2
ID1
IL
IL
IL
IL
IL
IL
IL
IL
IL
IL
IL
IL
V
V
V
V
VS
VS
VS
VS
VS
VS
VS
VS
TP
Application Notes:** Understanding Buck Power Stages in Switchmode Power Supplies (SLVA057) Under the Hood of Low Voltage DC/DCConverters (SLUP206) Controllers/Converters: TPS40020/21 TPS40007/09 TPS40040/41 TPS40075 TPS40077 TPS40140 TPS40180 TPS40192/3 TPS40200 TPS5410/20/30/50 TPS54350/550 TPS62110
The platform bar is a trademark of Texas Instruments. © 2010 Texas Instruments Incorporated. Printed in the U.S.A.
Printed on recycled paper.
tON
TP
Application Notes:** Understanding Boost Power Stages in Switchmode Power Supplies (SLVA061) High Voltage Power Supply Using a Highly Integrated DC/DC Converter (SLVA137) Under the hood of a Boost Converter (SEM1800 Topic 3) Controllers/Converters: TPS40210/11 UCC38050/51 (PFC) TPS61080 UCC3817A/18A (PFC) TPS61030 UCC3809-1 TPS61100 TPS61200 UCC28019A UCC28060 (PFC) UCC28061 UCC28070 UCC28220/21 UCC38C42 UCC3800
tON
TP
Application Notes:** Understanding Buck-Boost Power Stages in Switchmode Power Supplies (SLVA059A) Controllers/Converters: TPS40200 TPS40061 TPS40057 TPS5410/20/30/50 TPS54350/54550 TPS63700 UC3572 UCC3801/01/02/03/04/05 UCC3807 UCC3810 (Dual) UCC3813 UCC38C40/41/42/43/45
tON
TP
Application Notes:** Versatile Low Power SEPIC Converter Accepts Wide Input Voltage Range (SLUA158) High Power Factor Preregulator Using the SEPIC Converter (SLUP103) Controllers/Converters: TPS43000 TPS61130 UCC38C40/41/42/43/44/45 UCC3800/01/02/03/04/05/3813 UCC3807 UCC3810 (Dual)
tON
TP
Application Notes:** Design of Flyback Transformers and Inductors (SLUP076) Switching Power Supply Design Review – 60 Watt Flyback Regulator (SLUP072) Controllers: TPS23750/70 (PoE) UCC3807 UCC28220/21 UCC28600 (Green Mode) UCC28610 UCC35701/702 UCC35705/706 UCC3800/01/02/03/04/05/3813 UCC3809 UCC3810 (Dual) UCC38C40/41/42/43/44/45
PWM
tON
tON
TP
Application Notes:** 25-W Forward Converter Design Review Controllers: UCC28220/21 UCC35701/702 UCC35705/706 UCC3800/01/02/03/04/05/3813 UCC3807 UCC3809 UCC3810 (Dual) UCC38C40/41/42/43/44/45
(SLUA276)
TP
Application Notes:** Practical Considerations in Current Mode Power Supplies (SLUA110) Controllers: UCC27200/01 (MOSFET Driver) UCC28220/21 UCC35701/702 UCC35705/706 UCC3801/04/05/13 UCC3807 UCC3809 UCC3810 (Dual) UCC38C41/44/45
tON
PWM
tON TP
Application Notes:** Active Clamp and Reset Technique Enhances Forward Converter Performance (SLUP108) Design Considerations for Active Clamp and Reset Technique (SLUP112) Understanding and Deg an Active Clamp Current Mode Controlled Converter (SLUA535) Controllers: UCC2891, 2 ,3 ,4, 7 UCC2897A UCC3580-1 UC3824
TP
Application Notes:** Practical Considerations in Current Mode Power Supplies (SLUA110) Zero Voltage Switching Resonant Power Conversion (SLUA159) Controllers: UC28025 UC3825A, B UCC25600 UCC27200/01 (MOSFET Driver) UCC28089 (2 x 50%) UCC28250 UCC3806 UCC3808A UCC38083/84/85/86
PWM
tON
TP
Application Notes:** 1.5 MHz Current Mode IC Controlled 50-Watt Power Supply (SLUA053) The UC3823A,B and UC3825A,B Enhanced Generation of PWM Controllers (SLUA125) Controllers: UC28025 UC3825A, B UCC28089 (2 x 50%) UCC28250 UCC3806 UCC3808A UCC38083/84/85/86
1 x IOUT 2
( ) NS NP
PWM
PWM
PWM
NS x IOUT NP
VD1 = VIN x
PWM
PWM
( )
VDS = VIN
PWM
tON
* Excludes ripple current and output diode voltage drop. Continuous conduction mode shown (unless otherwise noted). For reliable operation follow recommendations in datasheets and application notes.
VOUT TP 1 = = TP-tON (1-D) VIN
tON
IQ2
ID2
IL2
tON TP
TP
Application Notes:** The UC3823A,B and UC3825A,B Enhanced Generation of PWM Controllers (SLUA125) Practical Considerations in Current Mode Power Supplies (SLUA110) Controllers: UC28025 UCC27200/01 (MOSFET Driver) UCC28089 (2 x 50%) UCC28230/1 UCC3806 UCC3808A UCC38083/84/85/86 UC3825A, B
Application Notes:** Design Review: 500-W, 40-W/in3 Phase Shifted ZVT Power Converter (SLUP102) Phase Shifted, Zero Voltage Transition Design Considerations (SLUA107) Controllers: UCC28950 UC3875 UC3879 UCC3895
SLUW001E
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