Designing a TMS320F280x Based Digitally Controlled DC-DC switching power supply.pdf
(
1933 KB
)
Pobierz
www.ti.com
Iin
Q1
Vout
Kd
L
Vin
C
Signal
Conditioning
R
L
R
C
Gate
Drive
Vos
Gp
A/D
d
PWM1
Vo
U
E
Gc(z)
Vref
TMS320F280x
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Sampling period N
N+1
T
S
T
S
Sampling Scheme 1
T
d
= 0.5T
s
n+1
PWM period n
Update
Duty
Update
Duty
T
d
T
d
Tadc
Tadc
T1
Interrupt
Interrupt
Start
ADC
Start
ADC
ISR
Write Compare
Write Compare
Code
Execution
t
Spare
Context Save
Execute Controller
Background loop
Context Restore
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d
Vo
Gp(s)
Fm
Kd
Vo
U
E
Gc(s)
V
ref
U(n)
E(n)
Gc(z)
sR
C
C1
s
2
LC
1
R
R
L
s
R
C
C
R
L
1
G
P
(S)V
in
(3.2410
5
s5.0)
(1.68510
9
s
2
1.64810
5
s1.0)
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(
14.3s
2
6.514
10
5
s
7.2
10
9
)
s
(
s
1.256
10
5
)
G
C1
(s)
Gc1_stf
14.3 6.514e005 7.2e009
,
[
1 1.256e005 0
]
; %Controller in s−domain%
Gc1_zc2d
(
Gc1_s, Ts,matched
)
; % Digital Controller %
G
C1
(z)
U
E
12.34
22.53z
1
10.28z
12
1
1.605z
1
0.6051z
2
U(n)
1.605U(n
1)
0.605U(n
2)
12.34E(n)
22.53E(n
1)
10.28E(n
2)
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