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參數資料
| 型號： | TPS51113DRCR |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩壓器 |
| 英文描述： | SWITCHING CONTROLLER, 330 kHz SWITCHING FREQ-MAX, PDSO10 |
| 封裝： | 3 X 3 MM, GREEN, PLASTIC, SON-10 |
| 文件頁數： | 3/26頁 |
| 文件大小： | 2137K |
| 代理商： | TPS51113DRCR |
(
)
V
IN
OUT
L
V
I
f
IN
RIPPLE
SW
-
=
RIPPLE
1
V
I
ESR
8
C
f
OUT
SW
÷
D
=
+
÷
è
( ) ( )
2
1
E
L
I
L
OH
OL
2
=
-
÷
è
( )
(
)
2
C
OUT
1
E
C
Vf
Vi
2
=
-
www.ti.com ....................................................................................................................................................................................................... SLUS864 – MAY 2009
APPLICATION INFORMATION
EXTERNAL PARTS SELECTION
CHOOSING THE INDUCTOR
The value of the output filtering inductor determines the magnitude of the current ripple, which also affects the
output voltage ripple for a certain output capacitance value. Increasing the inductance value reduces the ripple
current, and thus, results in reduced conduction loss and output ripple voltage. On the other hand, low
inductance value is needed due to the demand of low profile and fast transient response. Therefore, it is
important to obtain a compromise between the low ripple current and low inductance value.
In practical application, to ensure high power conversion efficiency at light load condition, the peak-to-peak
current ripple is usually designed to be between 1/4 to 1/2 of the rated load current. Since the magnitude of the
current ripple is determined by inductance value, switching frequency, input voltage and output voltage, the
required inductance value for a certain required ripple
I is shown in Equation 2,
(2)
where
VIN is the input voltage
VOUT is the output voltage
IRIPPLE is the required current ripple
f SW is the switching frequency
CALCULATING OUTPUT CAPACITANCE
When the inductance value is determined, the output capacitance value can also be derived according to the
output ripple voltage and output load transient response requirement. The output ripple voltage is a function of
both the output capacitance and capacitor ESR. Considering the worst case and assume the capacitance value
(3)
Thus, output capacitors with suitable ESR and capacitance value should be chosen to meet the ripple voltage
(
ΔV) requirement.
Minimum capacitance value is also calculated according to the demand of the load transient response. When the
load current changes, the energy that the inductor needs to release or absorb is derived in Equation 4.
(4)
At the same time, the energy that is delivered to or provided by the output capacitor can also be derived as
shown in Equation 5.
(5)
Copyright 2009, Texas Instruments Incorporated
11
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