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參數(shù)資料
| 型號： | TPS51113DRCR |
| 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)： | 9/26頁 |
| 文件大?。?/td> | 2137K |
| 代理商： | TPS51113DRCR |
1
2
3
4
10
9
8
7
PGOOD
VOS
FB
COMP_EN
BOOT
SW
HDRV
LDRV_OC
TPS51113
5
6
VDD
GND
11
R6
47 kW
C4
1 mF
R4
10 kW
R1
2 kW
R3
130 W
C3
8.2 nF
D1
MBR0530Tx
C5
0.1 mF
V
OUT
C2
3.9 nF
R2
2.7 kW
C1
22 nF
Enable
R5
10 kW
R
BIAS
2 kW
R
OC
7 kW
L1
1.5 mH
V
IN
Q2
BSC079N03S
C6
470 mF
C7
47 mF
–
+
UDG-08107
Q1
BSC079N03S
V
OUT
(
)
f
IN
O
IN
RIPPLE
SW
V
L
1.534 H
V
I
-
=
m
(
)
(
)
(
)
( )
2
OH
OL
OUT
2
f
i
L
I
C
279 F
V
-
=
m
-
www.ti.com ....................................................................................................................................................................................................... SLUS864 – MAY 2009
Figure 9. Design Example, 12 V to 1.6 V/10 A DC-DC Converter
Choosing the Inductor
Typically the peak-to-peak inductor current
ΔI is selected to be approximately between 20% and 40% of the rated
output current. In this design, IRIPPLE is targeted at around 30% of the load current. Using Equation 2.
(29)
Therefore, an inductor value of 1.5
μH is selected in practical, and the inductor ripple current is 3.08 A.
Calculating Output Capacitance
Minimum capacitance value can be calculated according to the demand of the load transient response.
Considering 0-A to 10-A step load and 10% overshoot and undershoot, the output capacitance value can be
estimated by using Equation 6,
(30)
A 470-
μF POS-CAP with 18-m ESR and a 47-μF ceramic capacitor are paralleled for the output capacitor.
Copyright 2009, Texas Instruments Incorporated
17
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