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參數資料
| 型號： | TPS57114QRTERQ1 |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩壓器 |
| 英文描述： | SWITCHING REGULATOR, 2000 kHz SWITCHING FREQ-MAX, PQCC16 |
| 封裝： | 3 X 3 MM, GREEN, PLASTIC, WQFN-16 |
| 文件頁數： | 16/37頁 |
| 文件大小： | 1309K |
| 代理商： | TPS57114QRTERQ1 |
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1
Co >
Voripple
8
sw
Iripple
Voripple
Resr <
Iripple
-
Vout
(Vinm ax
Vout)
Icorm s =
12
Vinm ax
L1
sw
(
)
Vinmin
Vout
Icirms = Iout
Vinmin
-
Ioutmax
0.25
Vin =
Cin
sw
D
SLVSAH5A
– DECEMBER 2010 – REVISED MARCH 2011
vertical spacer
Where
ΔIout is the change in output current, Fsw is the regulators switching frequency and ΔVout is the
allowable change in the output voltage.
(27)
vertical spacer
Equation 28 calculates the maximum ESR an output capacitor can have to meet the output voltage ripple
specification. Equation 28 indicates the ESR should be less than 55 m
. In this case, the ESR of the ceramic
capacitor is much less than 55 m
.
Additional capacitance de-ratings for aging, temperature and DC bias should be factored in which increases this
minimum value. For this example, two 22
μF 10 V X5R ceramic capacitors with 3 m of ESR are used.
Capacitors generally have limits to the amount of ripple current they can handle without failing or producing
excess heat. An output capacitor that can support the inductor ripple current must be specified. Some capacitor
data sheets specify the RMS (Root Mean Square) value of the maximum ripple current. Equation 29 can be used
to calculate the RMS ripple current the output capacitor needs to support. For this application, Equation 29 yields
333 mA.
(28)
vertical spacer
(29)
INPUT CAPACITOR
The TPS57114 -Q1 requires a high quality ceramic, type X5R or X7R, input decoupling capacitor of at least 4.7
μF of effective capacitance and in some applications a bulk capacitance. The effective capacitance includes any
DC bias effects. The voltage rating of the input capacitor must be greater than the maximum input voltage. The
capacitor must also have a ripple current rating greater than the maximum input current ripple of the TPS57114
-Q1. The input ripple current can be calculated using Equation 30.
The value of a ceramic capacitor varies significantly over temperature and the amount of DC bias applied to the
capacitor. The capacitance variations due to temperature can be minimized by selecting a dielectric material that
is stable over temperature. X5R and X7R ceramic dielectrics are usually selected for power regulator capacitors
because they have a high capacitance to volume ratio and are fairly stable over temperature. The output
capacitor must also be selected with the DC bias taken into account. The capacitance value of a capacitor
decreases as the DC bias across a capacitor increases.
For this example design, a ceramic capacitor with at least a 10 V voltage rating is required to support the
maximum input voltage. For this example, one 10
μF and one 0.1 μF 10 V capacitors in parallel have been
selected. The input capacitance value determines the input ripple voltage of the regulator. The input voltage
ripple can be calculated using Equation 31. Using the design example values, Ioutmax=4 A, Cin=10
μF, Fsw=1
MHz, yields an input voltage ripple of 100 mV and a rms input ripple current of 1.96 A.
(30)
vertical spacer
(31)
SLOW START CAPACITOR
The slow start capacitor determines the minimum amount of time it takes for the output voltage to reach its
Copyright
2010–2011, Texas Instruments Incorporated
23
Product Folder Link(s): TPS57114 -Q1
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