Buck Converter using PSpice
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This document describes the operation of a buck converter circuit. It contains diagrams and simulations showing: 1) The buck converter circuit design with key components labeled including an input voltage of 12V, output voltage of 3.3V at 6.6A. 2) Simulations of the output voltage and current over time as the circuit operates, reaching the target output. 3) Simulations of the voltage, current, and power characteristics of the synchronous buck diode during initial turn-on, overshoot, and steady-state periods. 4) Simulations of the voltage, current, and power characteristics of the MOSFET during initial turn-on, overshoot, and steady-state periods.
![Buck Converter
All Rights Reserved Copyright (C) Bee Technologies Corporation 2012 1
V1
12Vdc
R8
1m
L3
10nH
1
2
R3
10
R7
0.5
0
R6
1m
Vo
R5
10k
L1
0.01uH
1 2
U2
40CPQ050
S
V2
Implementation = V_sig
U1
2SK3682
R4
22
C3
1000u
C2
2n
R1
10
C1
2n
R2
1m
L2
100uH
1 2
Vin = 12[V]
Vout = 3.3[V]
Iout=6.6[A]](https://image.slidesharecdn.com/buckpsprostage1-210904014834/85/Buck-Converter-using-PSpice-1-320.jpg)
![Vout and Iout
All Rights Reserved Copyright (C) Bee Technologies Corporation 2012 2
Time
0s 1ms 2ms 3ms 4ms 5ms 6ms 7ms 8ms 9ms 10ms
-I(R7)
0A
2A
3A
4A
5A
6A
7A
8A
9A
10A
SEL>>
V(VO)
0V
0.5V
1.0V
1.5V
2.0V
2.5V
3.0V
3.5V
4.0V
4.5V
5.0V
Iout=6.587[A]
Vout=3.294[V]](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
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Buck Converter using PSpice
- 1. Buck Converter All Rights Reserved Copyright (C) Bee Technologies Corporation 2012 1 V1 12Vdc R8 1m L3 10nH 1 2 R3 10 R7 0.5 0 R6 1m Vo R5 10k L1 0.01uH 1 2 U2 40CPQ050 S V2 Implementation = V_sig U1 2SK3682 R4 22 C3 1000u C2 2n R1 10 C1 2n R2 1m L2 100uH 1 2 Vin = 12[V] Vout = 3.3[V] Iout=6.6[A]
- 2. Vout and Iout All Rights Reserved Copyright (C) Bee Technologies Corporation 2012 2 Time 0s 1ms 2ms 3ms 4ms 5ms 6ms 7ms 8ms 9ms 10ms -I(R7) 0A 2A 3A 4A 5A 6A 7A 8A 9A 10A SEL>> V(VO) 0V 0.5V 1.0V 1.5V 2.0V 2.5V 3.0V 3.5V 4.0V 4.5V 5.0V Iout=6.587[A] Vout=3.294[V]
- 3. SBD Characteristic reference Output Voltage All Rights Reserved Copyright (C) Bee Technologies Corporation 2012 3 Time 0s 1ms 2ms 3ms 4ms 5ms 6ms 7ms 8ms 9ms 10ms V(L2:1,U2:PIN1)*I(U2:PIN1) -20W -10W 0W 10W 20W V(L2:1,U2:PIN1) -4V 4V 8V 12V 16V 20V SEL>> I(U2:PIN1) -5A 0A 5A 10A 15A V(VO) 0V 1.0V 2.0V 3.0V 4.0V 5.0V Overshoot 2 Initial State 1 Steady State 3 Vout Current Voltage Power
- 4. Initial State SBD: Voltage, Current and Power All Rights Reserved Copyright (C) Bee Technologies Corporation 2012 4 1 Time 0s 10us 20us 30us 40us 50us 60us 70us 80us 90us 100us V(L2:1,U2:PIN1)*I(U2:PIN1) -20W -10W 0W 10W 20W V(L2:1,U2:PIN1) -4V 0V 4V 8V 12V 16V 20V I(U2:PIN1) -5A 0A 5A 10A 15A SEL>>
- 5. Overshoot SBD: Voltage, Current and Power All Rights Reserved Copyright (C) Bee Technologies Corporation 2012 5 2 Time 500us 510us 520us 530us 540us 550us 560us 570us 580us 590us 600us V(L2:1,U2:PIN1)*I(U2:PIN1) -20W -10W 0W 10W 20W SEL>> V(L2:1,U2:PIN1) -4V 0V 4V 8V 12V 16V 20V I(U2:PIN1) -5A 0A 5A 10A 15A
- 6. Steady State SBD: Voltage, Current and Power All Rights Reserved Copyright (C) Bee Technologies Corporation 2012 6 3 Time 5.00ms 5.01ms 5.02ms 5.03ms 5.04ms 5.05ms 5.06ms 5.07ms 5.08ms 5.09ms 5.10ms V(L2:1,U2:PIN1)*I(U2:PIN1) -20W -10W 0W 10W 20W SEL>> V(L2:1,U2:PIN1) -4V 0V 4V 8V 12V 16V 20V I(U2:PIN1) -5A 0A 5A 10A 15A
- 7. MOSFET Characteristic reference Output Voltage All Rights Reserved Copyright (C) Bee Technologies Corporation 2012 7 Time 0s 1ms 2ms 3ms 4ms 5ms 6ms 7ms 8ms 9ms 10ms I(U1:2)*V(R1:1,U1:3) -40W 120W 200W SEL>> V(U1:1,L2:1) -4V 4V 12V 20V V(R1:1,U1:3) 0V 10V 20V 30V 40V I(U1:2) -4A 0A 4A 8A 12A 16A V(VO) 0V 1.0V 2.0V 3.0V 4.0V 5.0V 1 Initial State 2 Overshoot 3 Steady State Vout IDS VDS VGS POWER
- 8. Initial State MOSFET: Turn On All Rights Reserved Copyright (C) Bee Technologies Corporation 2012 8 1 Time 0s 10us 20us 30us 40us 50us 60us 70us 80us 90us 100us I(U1:2)*V(R1:1,U1:3) -40W 40W 80W 120W 160W 200W SEL>> V(U1:1,L2:1) -4V 0V 4V 8V 12V 16V 20V V(R1:1,U1:3) 0V 10V 20V 30V 40V I(U1:2) -4A 0A 4A 8A 12A 16A
- 9. Overshoot MOSFET: Turn On All Rights Reserved Copyright (C) Bee Technologies Corporation 2012 9 2 Time 500us 510us 520us 530us 540us 550us 560us 570us 580us 590us 600us I(U1:2)*V(R1:1,U1:3) -40W 40W 80W 120W 160W 200W SEL>> V(U1:1,L2:1) -4V 0V 4V 8V 12V 16V 20V V(R1:1,U1:3) 0V 10V 20V 30V 40V I(U1:2) -4A 0A 4A 8A 12A 16A
- 10. Steady State MOSFET: Turn On All Rights Reserved Copyright (C) Bee Technologies Corporation 2012 10 3 Time 5.00ms 5.01ms 5.02ms 5.03ms 5.04ms 5.05ms 5.06ms 5.07ms 5.08ms 5.09ms 5.10ms I(U1:2)*V(R1:1,U1:3) -40W 40W 80W 120W 160W 200W SEL>> V(U1:1,L2:1) -4V 0V 4V 8V 12V 16V 20V V(R1:1,U1:3) 0V 10V 20V 30V 40V I(U1:2) -4A 0A 4A 8A 12A 16A