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參數資料
| 型號： | TPS51315RGFT |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩壓器 |
| 英文描述： | SWITCHING REGULATOR, 1000 kHz SWITCHING FREQ-MAX, PQCC40 |
| 封裝： | GREEN, PLASTIC, QFN-40 |
| 文件頁數： | 11/32頁 |
| 文件大小： | 1028K |
| 代理商： | TPS51315RGFT |
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OUT
V
0.75
R1
R2
0.75
-
=
(
)
(
)
f
OUT
ON max
IN min
V
1
T
V
=
( )
(
)
(
)
(
)
( )
IN min
ON(max)
T on
12
OUT
V
T
50ns
3
R
2
V
150mV
19 10
-
=
W
+
(
)
(
)
(
)
(
)
(
)
(
)
(
)
(
)
f
OUT
IN max
IND
IND ripple f
IN max
OUT max
IN max
V
1
3
L
I
V
I
V
-
-
=
=
(
)
( )
(
)
(
)
(
)
f
OUT
IN max
TRIP
IND peak
DS on
IN max
V
1
I
R
2 L
V
-
=
+
(
)
(
)
OUT
RIPPLE
OUT max
V
0.015
V
ESR
60 m
I
0.75
I
=
W
SLUS881A
– MAY 2009 – REVISED MAY 2011
External Component Selection
External component selection is a simple process in D-CAP
Mode.
1. Determine the value of R1 and R2.
The recommended R2 value is 10 k
to 100 k. Calculate R1 by using Equation 8.
(8)
2. Choose RT(on)
The switching frequency is usually determined by overall view of the dc-dc converter designer in
consideration of size, efficiency or cost, and mostly dictated by external component constraints such as the
size of inductor and/or the output capacitor. If an extremely low or high duty factor is expected, the minimum
on-time or off-time must also be considered to satisfy the required duty factor. Once the switching frequency
(9)
(10)
3. Choose the inductor.
To begin, choose an inductance value where the ripple current is approximately 1/4 to 1/2 of the maximum
output current.
(11)
For applications that require a fast transient response with a minimum of VOUT overshoot, consider a smaller
inductance value than calculated in Equation 11. The cost of a small inductance value is higher steady-state
ripple, larger line regulation, and higher switching loss.
The inductor also needs to have low DCR to achieve good efficiency, as well as enough room above the
peak inductor current before saturation. The peak inductor current can be estimated by Equation 12.
(12)
4. Choose output capacitor(s).
Organic semiconductor capacitor(s) or specialty polymer capacitor(s) are recommended. Determine an ESR
to meet the required ripple voltage. A quick approximation is shown in Equation 13.
(13)
Copyright
2009–2011, Texas Instruments Incorporated
19
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