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| 型號： | AN-32 |
| 英文描述： | TOPSwitch-GX Flyback Design Methodology |
| 中文描述： | 的TOPSwitch - GX系列反激式設(shè)計(jì)方法 |
| 文件頁數(shù)： | 9/16頁 |
| 文件大?。?/td> | 134K |
| 代理商： | AN-32 |
AN-32
9
B
12/02
Step 5. Set current waveform parameter K
P
for desired
mode of operation and current waveform: K
≡
K
RP
for K
P
≤
1.0 and K
P
≡
K
DP
for K
P
≥
1.0 (Figures 9 and 10)
For K
P
≤
1.0, K
P
≡
K
RP
, continuous mode (see Figure 9)
I
I
P
where I
R
is primary ripple current and I
P
is primary peak current
.
For K
P
≥
1.0, K
P
≡
K
DP
, discontinuous mode (see Figure 10)
For continuous mode design, set
K
P
= 0.4 for universal input
0.6 for 230 VAC or 115 VAC with doubler.
For discontinuous mode design, set K
= 1.0.
K
P
must be kept within the range specified in Table 5.
Figure 9. Continuous Mode Current Waveform, K
P
≤
1.
IR
K
P
≡
K
RP
=
I
R
I
P
(a) Continuous, KP < 1
(b) Borderline Continuous/Discontinuous, KP = 1
Primary
Primary
IR
IP
IP
PI-2587-011400
K
DP
=
K
P
≡
(1-D) x T
t
(b) Boarderline Discontinuous/Continuous, KP = 1
(a) Discontinuous, KP > 1
Secondary
Primary
Primary
Secondary
PI-2578-011800
D x T
D x T
t
(1-D) x T
(1-D) x T = t
T = 1/f
S
T = 1/f
S
Figure 10. Discontinuous Mode Current Waveform, K
P
≥
1.
K
K
P
RP
≡
=
K
K
V
V
D
×
V
D
P
DP
OR
MAX
MIN
DS
MAX
≡
=
×
(
)
(
)
1
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