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參數(shù)資料
| 型號： | AIC164230XTB |
| 廠商： | Analog Integrations Corporation |
| 英文描述： | 3-Pin One-Cell Step-Up DC/DC Converter |
| 中文描述： | 3引腳單細胞升壓型DC / DC轉換器 |
| 文件頁數(shù)： | 11/14頁 |
| 文件大?。?/td> | 251K |
| 代理商： | AIC164230XTB |
AIC1642
11
I
PK
I
IN
V
EXT
I
SW
I
OUT
V
SW
I
D
t
Continuous Conduction Mode
Continuous Conduction Mode
At the boundary between continuous and dis-
continuous mode, output current (I
OB
) is deter-
mined by
)
1
*
T
*
L
V
*
2
1
*
V
V
I
ON
IN
OUT
IN
OB
=
where Vd is the diode drop,
L
T
*
)
R
R
(
x
ON
S
ON
+
=
R
ON
= Switch turn on resistance, R
S
= Inductor
DC resistance
T
ON
= Switch ON time
In the discontinuous mode, the switching fre-
quency (Fsw) is
Fsw =
)
(1
T
V
)
(I
*
)
V
2
V
(V
*
(L)
*
2
ON
2
IN
OUT
IN
D
OUT
+
×
+
In the continuous mode, the switching fre-
quency is
(
+
D
OUT
ON
V
V
(
2
)
+
+
+
V
+
+
=
SW
D
OUT
IN
D
OUT
ON
SW
D
OUT
V
SW
IN
SW
IN
D
OUT
SW
V
V
V
V
V
T
1
)]
V
V
x
[1
*
)
V
V
(V
V
V
V
T
1
f
where Vsw = switch drop and proportion to out-
put current.
Inductor Selection
To operate as an efficient energy transfer ele-
ment, the inductor must fulfill three require-
ments. First, the inductance must be low
enough for the inductor to store adequate en-
ergy under the worst case condition of minimum
input voltage and switch ON time. Second, the
inductance must also be high enough so maxi-
mum current rating of AIC1642 and inductor are
not exceed at the other worst case condition of
maximum input voltage and ON time. Lastly, the
inductor must have sufficiently low DC resis-
tance so excessive power is not lost as heat in
the windings. But unfortunately this is inversely
related to physical size.
Minimum and maximum input voltage, output
voltage and output current must be established
in advance and then inductor can be selected.
In discontinuous mode operation, at the end of
the switch ON time, peak current and energy in
the inductor build according to
+
+
=
)
T
*
L
Rs
RON
exp(
1
*
Rs
R
V
I
ON
ON
IN
PK
(
)
2
x
1
*
T
*
L
V
ON
IN
ON
IN
T
L
V
(simple loss equation),
where
L
T
*
)
R
R
(
x
ON
S
ON
+
=
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