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| 型號(hào)： | TPS56121DQPT |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類(lèi)： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING CONTROLLER, 1100 kHz SWITCHING FREQ-MAX, PDSO22 |
| 封裝： | ROHS COMPLIANT, PLASTIC, SON-22 |
| 文件頁(yè)數(shù)： | 6/25頁(yè) |
| 文件大小： | 653K |
| 代理商： | TPS56121DQPT |
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-
=
=
IN(max)
OUT
IN(max)
SW
V
1
14 V
1.2 V
1
L
487 nH
0.3
I
V
f
0.3
15 A
14 V
500 kHz
(
)
(
)
(
)
(
)
(
) ( )
(
)
(
) ( )
(
)
(
)
=
+
=
+
=
+
=
2
1
RIPPLE
OUT
RIPPLE
L rms
L avg
12
I
15
3.2
15.03 A
(
)
(
)
(
)
( )
=
+
-
=
p
m
+
-
=
m +
m -
m =
m
p
2
TRAN(max)
FALL
OUT min
OVER
OUT
OVER
2
I
L
I
t
C
3
BW
V
2
V
5
680 nH
5
5 A
1 s
177 F
142 F
50 F
269 F
3
60 kHz
50 mV
2
1.2
50 mV
-
÷
÷
-
m
è
è
=
W
RIPPLE
RIPPLE(tot)
RIPPLE(cap)
OUT
SW
MAX
RIPPLE
I
3.2 A
V
24 mV
V
8
C
f
8
269 F
500 kHz
ESR
6.5 m
I
3.2 A
SLUSAH4
– MARCH 2011
Design Procedure
Switching Frequency Selection
To achieve a balance between small size and high efficiency for this design, use switching frequency of 500 kHz.
Inductor Selection (L1)
Synchronous buck power inductors are typically sized for between approximately 20% and 40% peak-to-peak
ripple current (IRIPPLE).
Using this target ripple current, the required inductor size can be calculated as shown in Equation 3.
(3)
Selecting a standard 680-nH inductor value, IRIPPLE =7.3A.
The RMS current through the inductor is approximated in Equation 4.
(4)
Output Capacitor Selection (C18, C20, C23)
The selection of the output capacitor is typically driven by the output transient response. The selection of the
output capacitor is typically driven by the output transient response.
loop bandwidth delay
inductor slew-rate delay
transient slew-rate
(5)
With a minimum capacitance, the maximum allowable ESR is determined by the maximum ripple voltage and is
approximated inEquation 6.
(6)
In order to meet the low ESR and high capacitance requirements of this design, 5 47-
F, 1210, 2 22-F, 1206,
and 1 10-
F, 0805 ceramic capacitors are selected. The combination of multiple capacitor types and ceramic
capacitors of different sizes provides a wider band to the filtering frequencies of the output capacitors.
14
Copyright
2011, Texas Instruments Incorporated
Product Folder Link(s) :TPS56121
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