參數(shù)資料
型號： TPS40303DRCT
廠商： TEXAS INSTRUMENTS INC
元件分類： 穩(wěn)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(shù)： 7/31頁
文件大?。?/td> 1798K
代理商： TPS40303DRCT
(
)
(
)
OUT
IN m ax
OUT
SW
IN m ax
V
1
14 V
1.8 V
1
L
471nH
0.3
I
V
f
0.3
10 A
14 V
1200 kHz
-
=
=
(
)
(
)
2
1
RIPPLE
OUT
RIPPLE
L rms
L avg
12
I
10
3.5
10.05 A
=
+
=
+
=
+
=
2
TRAN
OVER
OUT
I
L
I
L
V
T
C
V
C
<
D =
=
(
)
2
TRAN
UNDER
OUT
IN
OUT
IN
OUT
I
L
I
L
V
T
C
V
C
<
D
=
=
-
(
)
2
TRAN(max)
OUT(min)
OUT
OVER
I
L
4
400nH
C
35 F
1.8 100mV
V
=
m
RIPPLE
RIPPLE(total)
RIPPLE(cap)
OUT
SW
MAX
RIPPLE
I
V
8 C
f
ESR
I
3.5 A
36mV
8 35 F 1200kHz
7m
3.5 A
-
÷
-
è
=
-
÷
m
è
=
W
www.ti.com
SLUS964 – NOVEMBER 2009
Inductor Selection (L1)
Synchronous buck power inductors are typically sized for approximately 30% peak-to-peak ripple current (IRIPPLE)
Given this target ripple current, the required inductor size can be calculated in Equation 3.
(3)
Selecting a standard 400-nH inductor value, solve for IRIPPLE =3.5 A
The RMS current through the inductor is approximated by Equation 4.
(4)
Output Capacitor Selection (C12)
The selection of the output capacitor is typically driven by the output transient response. Equation 5 and
Equation 6 overestimate the voltage deviation to account for delays in the loop bandwidth and can be used to
determine the required output capacitance.
(5)
(6)
If VIN(min) > 2 x VOUT, use overshoot (Equation 5) to calculate minimum output capacitance. If VIN(min) < 2 x VOUT,
use undershoot(Equation 6) to calculate minimum output capacitance.
(7)
With a minimum capacitance, the maximum allowable ESR is determined by the maximum ripple voltage and is
approximated by Equation 8.
(8)
Two 0805, 22-F, 6.3 V, X5R ceramic capacitors are selected to provide more than 35-F of minimum
capacitance and less than 7 m
Ω of ESR (2.5 mΩ each).
Copyright 2009, Texas Instruments Incorporated
15
Product Folder Link(s) :TPS40303 TPS40304 TPS40305
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