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參數資料
| 型號： | TK65127 |
| 廠商： | TOKO Inc. |
| 英文描述： | STEP-UP VOLTAGE CONVERTER WITH VOLTAGE MONITOR |
| 中文描述： | 升壓電壓電壓監(jiān)控轉爐 |
| 文件頁數： | 15/20頁 |
| 文件大?。?/td> | 138K |
| 代理商： | TK65127 |
January 1999 TOKO, Inc.
Page 15
TK651xx
HIGHER-ORDER DESIGN EQUATION
The equation above was developed as a closed form approximation. In order to allow for a closed form, the design variable
that requires 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
F
Diode forward voltage
D
Oscillating duty ratio of main switch
L
Inductance value
Inductor winding resistance
R
OF
Output filter resistance
Snubber capacitance
V
OUT
Output voltage
V
BB
Battery voltage, unloaded
f
Oscillator frequency
R
S
Source resistance (battery + filter) R
L
R
SW
Switch on-state resistance
R
U
ESR of upstream output capacitor C
S
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.)
C
S
[V
BB
-
2
+ (V
OUT
+ V
F
)
2
+ (V
OUT
+ V
F
- V
BB
)
2
]
2(V
OUT
+ V
F
)
I
OUT
=
V
OUT
+ R
OF
I
OUT(TGT)
+ D
BB
R
U
) + V
F
- V
BB
1 - D
S
+ R
L
)
2 L
(
2 L
)
2 L
D
[
(
2 L
1- D
S
+ R
L
+ R
SW
)
]
2
V
BB
2
D
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