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參數(shù)資料
| 型號： | TK65020MTL |
| 廠商： | TOKO INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | Metalized Polyester Film Radial Lead Capacitor; Capacitance: .22uF; Voltage: 250V; Packaging: Bulk |
| 中文描述： | SWITCHING REGULATOR, 102 kHz SWITCHING FREQ-MAX, PDSO6 |
| 封裝： | SOT-23L, SMT-6 |
| 文件頁數(shù)： | 10/14頁 |
| 文件大?。?/td> | 94K |
| 代理商： | TK65020MTL |
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
F
Diode forward voltage
D
Oscillating duty ratio of main switch
L
Inductance value
R
L
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
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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