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| 型号： | TPS53124RGET |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | DUAL SWITCHING CONTROLLER, PQCC24 |
| 封装： | GREEN, PLASTIC, QFN-24 |
| 文件页数： | 7/22页 |
| 文件大小： | 656K |
| 代理商： | TPS53124RGET |
(
)
(
)
1
3
IN (max)
OUT
IN (max)
OUT
IND( ripple )
OUT (max)
IN (max)
L
f
V
I
-
-
=
×
=
(5)
1
IN (max)
OUT
TRIP
IND( peak )
DS ( on )
IN (max)
(V
V
) V
V
R
L
f
V
I
-
=
+
(6)
www.ti.com ..................................................................................................................................................... SLUS825B – FEBRUARY 2008 – REVISED MAY 2008
The external components selection is much simpler in D-CAP Mode.
1. Choose inductor.
The inductance value should be determined to give the ripple current of approximately 1/4 to 1/2 of maximum
output current. Larger ripple current increases output ripple voltage, improves S/N ratio and contributes to a
stable operation.
The inductor also needs to have low DCR to achieve good efficiency, as well as enough room above peak
inductor current before saturation. The peak inductor current can be estimated as follows.
2. Choose output capacitor.
Polymer aluminum capacitor, organic semiconductor capacitor or specialty polymer capacitor are
recommended. Determine ESR to meet required ripple voltage indicated previously.
Copyright 2008, Texas Instruments Incorporated
15
Product Folder Link(s): TPS53124
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