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| 型号： | TPS53321RGTR |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHING REGULATOR, 1210 kHz SWITCHING FREQ-MAX, PQCC16 |
| 封装： | 3 X 3 MM, GREEN, PLASTIC, QFN-16 |
| 文件页数： | 7/23页 |
| 文件大小： | 505K |
| 代理商： | TPS53321RGTR |
I
L
V
OUT
a x IL(ripple)
T1
V
RIPPLE
a x T
I
OUT
UDG-10055
(
)
(
)
=
-
OUT
IN ripple
I
D
1 D
=
OUT
IN
V
D
V
(
)
=
OUT
IN ripple
SW
IN
I
D
V
f
C
+
=
+
+
+
÷
+
è
OUT
CO
2
OUT
LOAD
1 s C
ESR
G
4
L
1 s
C
(ESR
DCR)
s
L C
DCR
R
=
p
fDP
OUT
1
2
L C
www.ti.com
SLUSAF3 – DECEMBER 2010
Figure 14. DCM VOUT Ripple Calculation
4. CHOOSE THE INPUT CAPACITOR
The selection of input capacitor should be determined by the ripple current requirement. The ripple current
generated by the converter needs to be absorbed by the input capacitors as well as the input source. The RMS
ripple current from the converter can be expressed in Equation 9.
where
D is the duty cycle and can be expressed as shown in Equation 10
(9)
(10)
To minimize the ripple current drawn from the input source, sufficient input decoupling capacitors should be
placed close to the device. The ceramic capacitor is recommended because it provides low ESR and low ESL.
The input voltage ripple can be calculated as shown in Equation 11 when the total input capacitance is
determined.
(11)
5. COMPENSATION DESIGN
The TPS53321 uses voltage mode control. To effectively compensate the power stage and ensure fast transient
response, Type III compensation is typically used.
The control to output transfer function can be described in Equation 12.
(12)
The output L-C filter introduces a double pole which can be calculated as shown in Equation 13.
(13)
The ESR zero can be calculated as shown in Equation 14.
Copyright 2010, Texas Instruments Incorporated
15
Product Folder Link(s) :TPS53321
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