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參數(shù)資料
| 型號： | TPS62000SHKK |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 1.6 A SWITCHING REGULATOR, 1000 kHz SWITCHING FREQ-MAX, CDFP10 |
| 封裝： | CERAMIC, DFP-10 |
| 文件頁數(shù)： | 16/23頁 |
| 文件大?。?/td> | 531K |
| 代理商： | TPS62000SHKK |
2
O
I
L
I
O
L(max)
I
O(max)
I
V
V
1
I = V
D
L
f
-
D
′
=
+
′
(4)
OUTPUT CAPACITOR SELECTION
For best performance, a low ESR output capacitor is needed. At output voltages greater than 1.8 V, ceramic
output capacitors can be used to show the best performance. Output voltages below 1.8 V require a larger output
capacitor and ESR value to improve the performance and stability of the converter.
1
2
3
O
I
RMS(C )
I
O
V
V
1
= V
L
f
-
′
′
′
′
(5)
O
I
O
O
O
V
1
V
1
V
= V
ESR
L
8 C
f
f
-
è
÷
D
′
′
+
′
′
(6)
SLVS917A–MARCH 2009–REVISED JUNE 2009..........................................................................................................................................................
www.ti.com
Where:
= Switching frequency (750 kHz typical)
L = Inductor value
Δ
I
L
= Peak-to-peak inductor ripple current
I
L(max)
= Maximum inductor current
The highest inductor current occurs at maximum V
I
.
A more conservative approach is to select the inductor current rating just for the maximum switch current of the
TPS62000 which is 1.6 A with ILIM = V
IN
and 900 mA with ILIM = GND. See
Table 1
for recommended
inductors.
Table 1. Tested Inductors
(1)
OUTPUT CURRENT
INDUCTOR VALUE
COMPONENT SUPPLIER
Coilcraft DO3316P-103
Coilcraft DT3316P-103
Sumida CDR63B-100
Sumida CDRH5D28-100
Coilcraft DO1608C-103
Sumida CDRH4D28-100
Coilcraft DO1608C-103
Murata LQH4C100K04
COMMENTS
High efficiency
0 mA to 600 mA
10
μ
H
Smallest solution
High efficiency
Smallest solution
0 mA to 300 mA
10
μ
H
(1)
Parts are valid for –40°C to 85°C.
Table 2. Capacitor Selection
OUTPUT VOLTAGE RANGE
1.8 V
≤
V
I
≤
5.5 V
0.8 V
≤
V
I
< 1.8 V
OUTPUT CAPACITOR
C
o
≥
10
μ
F
C
o
≥
47
μ
F
OUTPUT CAPACITOR ESR
ESR
≤
120 m
ESR > 50 m
See
Table 3
for recommended capacitors.
If an output capacitor is selected with an ESR value
≤
120 m
, its RMS ripple current rating always meets the
application requirements. Just for completeness, the RMS ripple current is calculated as:
The overall output ripple voltage is the sum of the voltage spike caused by the output capacitor ESR plus the
voltage ripple caused by charge and discharging the output capacitor:
Where the highest output voltage ripple occurs at the highest input voltage V
I
.
16
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Copyright 2009, Texas Instruments Incorporated
Product Folder Link(s):
TPS62000-HT
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