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TK65020 Datasheet(PDF) 10 Page - TOKO, Inc

Part # TK65020
Description  STEP-UP VOLTAGE CONVERTER
Download  14 Pages
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Manufacturer  TOKO [TOKO, Inc]
Direct Link  http://www.toko.com
Logo TOKO - TOKO, Inc

TK65020 Datasheet(HTML) 10 Page - TOKO, Inc

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ADVANCED INFORMATION
Page 10
January 1999 TOKO, Inc.
TK65020
HIGHER-ORDER DESIGN EQUATION
The equation above was developed as a closed form approximation. In order to allow a closed form approximation, the
design variable that required the least approximation was “I
OUT,” as opposed to “L”.
The approximations made in the equation development have the primary consequence that error is introduced as
resistive losses become relatively large. As it is normally a practical design goal to ensure that resistive losses will be
relatively small, this seems acceptable. The variables used are:
I
OUT
Output current
capability
I
OUT(TGT)
Targeted output current capability
V
OUT
Output voltage
V
F
Diode forward voltage
V
BB
Battery voltage, unloaded
D
Oscillating duty ratio of main switch
f
Oscillator frequency
L
Inductance value
R
S
Source resistance (battery + filter)
R
L
Inductor winding resistance
R
SW
Switch on-state resistance
R
OF
Output filter resistance
R
U
ESR of upstream output capacitor
C
S
Snubber capacitance
Deriving a design solution with this equation is necessarily an iterative process. Use worst-case tolerances as described
for inductor selection, using different values for “L” to approximately achieve an “I
OUT” equal to the targeted value. Then,
fine tune the parasitic values as needed and, if necessary, readjust “L” again and reiterate the process.
SINGLE-CELL APPLICATION (CONT.)
ƒC
S [VBB
2+ (V
OUT+ VF)
2 + (V
OUT + VF - VBB)
2 ]
2(V
OUT + VF)
I
OUT =
V
OUT + ROFIOUT(TGT) +
(V
BBRU) + VF - VBB
1 -
(R
S+ RL)
2ƒ L
D
(
2ƒ L
D
)
2ƒ L
D
[
)
(
2ƒ L
D
1-
(R
S + RL + RSW)
]
2
-
V
BB
2
D


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