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UC3380L-XX-AF5-R датащи(PDF) 6 Page - Unisonic Technologies

номер детали UC3380L-XX-AF5-R
подробное описание детали  PWM STEP UP DC-DC CONTROLLER
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производитель  UTC [Unisonic Technologies]
домашняя страница  http://www.utc-ic.com
Logo UTC - Unisonic Technologies

UC3380L-XX-AF5-R датащи(HTML) 6 Page - Unisonic Technologies

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UC3380
CMOS IC
UNISONICTECHNOLOGIESCO.,LTD
6 of 9
www.unisonic.com.tw
QW-R502-099.C
APPLICATION CIRCUIT INFORMATION
The following equations show the relation of the basic design parameters.
1. Refer to the application circuit, the increasing inductor current when the switch is turn on is given by the following
equation
11
()
LL ON
IN
S
d
iU T
U
U
LL
f
+
Δ=
=
(
IN
U :input voltage ;
S
U :transistor saturation voltage)
The decreasing inductor current when the switch is turn off can derive by the equation below
11
1
()
LL OFF
O
D
IN
d
iU T
U
U
U
LL
f
Δ=
= −
+
D
U :diode forward voltage)
according to
0
LL
ii
+−
Δ+ Δ
= ,the duty ratio is given by
OD
IN
OD
S
UU
U
d
UU
U
+−
=
+−
2. The average current flowing through the inductor is
1
O
L
I
I
d
=
3. We note that
(1
)
OL
I
dI
=−
then we can write:
(1
)
L
OL
L
I
I
di
i
=−
• Δ
Δ
substituting
1
LL OFF
iU T
L
Δ=
L
i
Δ for equation above, output current is given by
11
(1
)
OL OFF
I
dU T
ICR L
=−
(
ICR =
L
L
i
I
Δ
)
11
1
(1
)
(
)
OD
IN
d
Id
Uo U
U
ICR L
f
=−
+
derive that
4. The peak current of the inductor is given by
1
2
PKL
L
I
Ii
=+ Δ
1
2
L
PKL
L
L
i
I
II
I
Δ
=+
according to
ICR =
L
L
i
I
Δ
derive that
1
2
PKL
L
I
IICR I
=+
Then derive the following equation for peak current of inductor
1
(1
)
2
PK
L
I
IICR
=+


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