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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： | 6/23页 |
| 文件大小： | 505K |
| 代理商： | TPS53321RGTR |
OUT
0.6
R2
R1
V
0.6
=
-
(
)
(
)
-
=
f
IN
OUT
L ripple
SW
IN
V
1
I
L
V
( )
(
)
(
)
=
+
RIPPLE
RIPPLE C
RIPPLE ESR
RIPPLE ESL
V
( )
(
)
=
L ripple
RIPPLE C
OUT
SW
I
V
8 C
f
(
)
(
)
=
RIPPLE ESR
L ripple
V
I
ESR
(
)
=
IN
RIPPLE ESL
V
ESL
V
L
(
)
(
)
(
)
(
)
a
-
=
2
OUT
L ripple
RIPPLE DCM
OUT
SW
L ripple
I
V
2 C
f
I
(
)
(
)
a =
ON DCM
ON CCM
t
SLUSAF3 – DECEMBER 2010
www.ti.com
External Components Selection
1. DETERMINE THE VALUE OF R1 AND R2
The output voltage is programmed by the voltage-divider resistor, R1 and R2 shown in Figure 13. R1 is
connected between the FB pin and the output, and R2 is connected between the FB pin and GND. The
recommended value for R1 is from 1 k
Ω to 5 kΩ. Determine R2 using equation in Equation 1.
(1)
2. CHOOSE THE INDUCTOR
The inductance value should be determined to give the ripple current of approximately 20% to 40% of maximum
output current. The inductor ripple current is determined by Equation 2:
(2)
The inductor also needs to have low DCR to achieve good efficiency, as well as enough room above peak
inductor current before saturation.
3. CHOOSE THE OUTPUT CAPACITOR(S)
The output capacitor selection is determined by output ripple and transient requirement. When operating in CC
mode, the output ripple has three components:
(3)
(4)
(5)
(6)
When ceramic output capacitors are used, the ESL component is usually negligible. In the case when multiple
output capacitors are used, ESR and ESL should be the equivalent of ESR and ESL of all the output capacitor in
parallel.
When operating in DCM, the output ripple is dominated by the component determined by capacitance. It also
varies with load current and can be expressed as shown in Equation 7.
where
a is the DCM on-time coefficient and can be expressed in Equation 8 (typical value 1.25)
(7)
(8)
14
Copyright 2010, Texas Instruments Incorporated
Product Folder Link(s) :TPS53321
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