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参数资料
| 型号： | TPS63031DSKT |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | 1.1 A SWITCHING REGULATOR, 2600 kHz SWITCHING FREQ-MAX, PDSO10 |
| 封装： | 2.50 X 2.50 MM, PLASTIC, SON-10 |
| 文件页数： | 7/24页 |
| 文件大小： | 1326K |
| 代理商： | TPS63031DSKT |
I
1 +
I
OUT
0.8 )
V
OUT VIN1 * VOUT
2
V
IN1
f
L
(4)
I
2 +
V
OUT
I
OUT
0.8
V
IN2
)
V
IN2
V
OUT * VIN2
2
V
OUT
f
L
(5)
CAPACITOR SELECTION
Input Capacitor
Bypass Capacitor
Output Capacitor
C
OUT + 5
L
mF
mH
(6)
www.ti.com.................................................................................................................................................. SLVS696A – OCTOBER 2008 – REVISED MARCH 2009
With the chosen inductance value, the peak current for the inductor in steady state operation can be calculated.
Equation 4 shows how to calculate the peak current I1 in step down mode operation and Equation 5 shows how
to calculate the peak current I2 in boost mode operation.
In both equations f is the minimum switching frequency. VIN2 is the minimum input voltage. The critical current
value for selecting the right inductor is the higher value of I1 and I2. It also needs to be taken into account that
load transients and error conditions may cause higher inductor currents. This also needs to be taken into account
when selecting an appropriate inductor. The following inductor series from different suppliers have been used
with TPS6303x converters:
Table 1. List of Inductors
VENDOR
INDUCTOR SERIES
LPS3015
Coilcraft
EPL3010
Murata
LQH3NP
Tajo Yuden
NR3015
At least a 4.7
F input capacitor is recommended to improve transient behavior of the regulator and EMI
behavior of the total power supply circuit. A ceramic capacitor placed as close as possible to the VIN and PGND
pins of the IC is recommended.
To make sure that the internal control circuits are supplied with a stable low noise supply voltage, a capacitor can
be connected between VINA and GND. Using a ceramic capacitor with a value of 0.1
F is recommended. The
value of this capacitor should not be higher than 0.22
F.
For the output capacitor, it is recommended to use small ceramic capacitors placed as close as possible to the
VOUT and PGND pins of the IC. If, for any reason, the application requires the use of large capacitors which can
not be placed close to the IC, using a smaller ceramic capacitor in parallel to the large one is recommended.
This small capacitor should be placed as close as possible to the VOUT and PGND pins of the IC.
To get an estimate of the recommended minimum output capacitance, Equation 6 can be used.
A capacitor with a value in the range of the calculated minimum should be used. This is required to maintain
control loop stability. There are no additional requirements regarding minimum ESR. There is also no upper limit
for the output capacitance value. Larger capacitors will cause lower output voltage ripple as well as lower output
voltage drop during load transients.
Copyright 2008–2009, Texas Instruments Incorporated
15
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