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AIC164227XBG Datasheet(PDF) 11 Page - Analog Intergrations Corporation

Part # AIC164227XBG
Description  3-Pin One-Cell Step-Up DC/DC Converter
Download  14 Pages
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Manufacturer  AIC [Analog Intergrations Corporation]
Direct Link  http://www.analog.com.tw
Logo AIC - Analog Intergrations Corporation

AIC164227XBG Datasheet(HTML) 11 Page - Analog Intergrations Corporation

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AIC1642
11
I
PK
IIN
V
EXT
I
SW
IOUT
V
SW
I
D
t
Continuous Conduction Mode
Continuous Conduction Mode
At the boundary between continuous and dis-
continuous mode, output current (IOB) is deter-
mined by
)
x
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
+
=
RON= Switch turn on resistance, RS= Inductor
DC resistance
TON = Switch ON time
In the discontinuous mode, the switching fre-
quency (Fsw) is
Fsw =
)
x
(1
T
V
)
(I
*
)
V
V
(V
*
(L)
*
2
2
ON
2
IN
OUT
IN
D
OUT
+
×
−
+
In the continuous mode, the switching fre-
quency is
(
)
−
+
−
+
≅
−
+
−
+
−
+
−
+
=
SW
D
OUT
IN
D
OUT
ON
SW
D
OUT
SW
IN
SW
D
OUT
IN
D
OUT
ON
SW
V
V
V
V
V
V
T
1
)]
V
V
V
V
V
(
2
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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