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| 型號(hào)： | AND8112 |
| 廠商： | ON SEMICONDUCTOR |
| 英文描述： | A Quasi-Resonant SPICE Model Eases Feedback Loop Designs |
| 中文描述： | 阿準(zhǔn)諧振SPICE模型反饋環(huán)的設(shè)計(jì)更易 |
| 文件頁(yè)數(shù)： | 6/12頁(yè) |
| 文件大?。?/td> | 205K |
| 代理商： | AND8112 |
AND8112/D
http://onsemi.com
6
I1(t)
Vg
ton
2
2
LP
t1
t2
(N
Vg)
V
ton
V
(eq. 35)
Similarly to the simplified model analysis, one can note
that the average input current is proportional to the input
voltage. The effective resistance Re is thus: Re(t
on
) =
[(N
2
LP
ton
2
It is pleasant to confirm that if
expression reduces to equation 21
…
Then, the equivalent circuit depicted in Figure 6 and based
on the lossfree resistor Re(
t
on
) can be applied. To complete
the model, let’s calculate <I
2(t)
> by combining equations
(17) where d
′
is taken equal to (t
demag
/T
S
), (13) and (31):
1
N
2
LP
t1
t2
Vg)
V]
ton
V
(eq. 36)
t1
=
t2
=0, the Re(
t
on
)
I2(t)
Vg
ton
ton
TS
N
Vg
V
(eq. 37)
Substitution of equation (32) giving T
S
into equation (37),
leads to: <I
2(t)
> =
Vg
ton
2
LP
t1
t2
This expression can be simplified as follows: <I
2(t)
> =
Vg
Re(ton)
V
Vf
The model assumes a 100% efficiency power transfer. To
better stick to reality, the above expression should be
multiplied by the estimated efficiency to obtain the final
<I
2(t)
> equation:
ton
(N
Vg)
V
ton
V
Vg
V
(eq. 38)
Vg
I1(t)
Vg
V
Vf
(eq. 39)
I2(t)
I1(t)
Vg
V
Vf
eff
(eq. 40)
where
eff
is the efficiency.
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