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| 型号： | TK65130MTL |
| 厂商： | ASAHI KASEI POWER DEVICES CORP |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHING REGULATOR, 102 kHz SWITCHING FREQ-MAX, PDSO6 |
| 封装： | SOT-23L, SMT-6 |
| 文件页数： | 7/20页 |
| 文件大小： | 158K |
| 代理商： | TK65130MTL |
January 2001 TOKO, Inc.
Page 15
TK651xxM
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
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.)
C
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)
2 L
D
(
2 L
D
)
2 L
D
[
)
(
2 L
D
1-
(R
S + RL + RSW)
]
2
-
V
BB
2
D
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