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SS6638G Datasheet(PDF) 16 Page - Silicon Standard Corp.

Part # SS6638G
Description  Simple 3-Pin Step-Up DC/DC Converter
PDF  19 Pages
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Manufacturer  SSC [Silicon Standard Corp.]
Direct Link  http://www.siliconstandard.com
Logo SSC - Silicon Standard Corp.

SS6638G Datasheet(HTML) 16 Page - Silicon Standard Corp.

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IPK
I
IN
VEXT
ISW
IOUT
VSW
ID
t
IV
(
)
)]
V
V
V
V
V
(
2
x
[1
)
V
V
(V
V
V
V
T
1
fsw
SW
D
OUT
SW
IN
SW
D
OUT
IN
D
OUT
ON
−
+
−
+
×
−
+
−
+
=
−
+
−
+
≅
SW
D
OUT
IN
D
OUT
ON
V
V
V
V
V
V
T
1
where Vsw = switch drop and is proportional
to output current.
INDUCTOR SELECTION
To operate as an efficient energy transfer
element,
the
inductor
must
fulfill
three
requirements. First, the inductance must be low
enough for the inductor to store adequate energy
under the worst-case condition of minimum input
voltage
and switch
ON time.
Second,
the
inductance must also be high enough so the
maximum current rating of the SS6638 and inductor
are not exceeded at the other worst-case condition
of maximum input voltage and ON time. Lastly,
the inductor must have sufficiently low DC
resistance so excessive power is not lost as heat
in the windings. Unfortunately this is inversely
related to physical size.
Continuous Conduction Mode
At
the
boundary
between
continuous
and
discontinuous mode, output current (IOB) is
determined by
()
x
1
T
L
V
2
1
V
V
V
I
ON
IN
D
OUT
IN
OB
−
+
=
where VD is the diode drop,
Minimum and maximum input voltage, output
voltage and output current must be established
before an inductor can be selected.
x = (RON+Rs)Ton/L.
RON= Switch turn on resistance, Rs= Inductor DC
resistance
In discontinuous mode operation, at the end of
the switch ON time, peak current and energy in
the inductor build according to
TON = Switch ON time
In
the
discontinuous
mode,
the
switching
frequency (Fsw) is
+
−
−
+
=
Ton)
L
Rs
Ron
exp(
1
Rs
Ron
Vin
IPK
)
x
(1
2
T
2
V
)
)(I
V
V
2(L)(V
Fsw
ON
IN
OUT
IN
D
OUT
+
×
−
+
=
()
 −
≅
2
x
1
T
L
V
ON
IN
In the continuous mode, the switching frequency
is
ON
IN
T
L
V
≅
(Simple losses equation),
where x=(RON+RS)TON/L
SS6638G
8/21/2005 Rev.2.3



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