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參數(shù)資料
| 型號(hào)： | TPS5420D |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 6.5 A SWITCHING REGULATOR, 600 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封裝： | PLASTIC, MS-012AA, SOIC-8 |
| 文件頁數(shù)： | 5/24頁 |
| 文件大?。?/td> | 738K |
| 代理商： | TPS5420D |
www.ti.com
f
CO +
f
LC
2
85 V
OUT
(7)
C
OUT +
1
3357
L
OUT
f
CO
V
OUT
(8)
ESR
MAX +
1
2p
C
OUT
f
CO
(9)
VPP(MAX)=
()
ESR
xV
V
MAX
OUT
IN(MAX)
OUT
x
-
NC
IN(MAX)
OUT
SW
xV
xL
xF
x0.8
(10)
1
x
ICOUT(RMS) =
12
[
]
VOUT
IN(MAX)
OUT
xV
-V
VIN(MAX)
OUT
SW
xL
-F
x0.8xNC
()
(11)
SLVS642C – APRIL 2006 – REVISED OCTOBER 2007
design of the internal compensation, it is recommended to keep the closed loop crossover frequency in the range
3 kHz to 30 kHz as this frequency range has adequate phase boost to allow for stable operation. For this design
example, the intended closed loop crossover frequency is between 2590 Hz and 24 kHz, and below the ESR
zero of the output capacitor. Under these conditions, the closed loop crossover frequency is related to the LC
corner frequency as:
and the desired output capacitor value for the output filter to:
For a desired crossover of 18 kHz and a 33-
μH inductor, the calculated value for the output capacitor is 100 μF.
The capacitor type should be chosen so that the ESR zero is above the loop crossover. The maximum ESR is:
The maximum ESR of the output capacitor also determines the amount of output ripple as specified in the initial
design parameters. The output ripple voltage is the inductor ripple current times the ESR of the output filter.
Check that the maximum specified ESR as listed in the capacitor data sheet results in an acceptable output
ripple voltage:
Where:
ΔVPP is the desired peak-to-peak output ripple.
NC is the number of parallel output capacitors.
FSW is the switching frequency.
The minimum ESR of the output capacitor should also be considered. For a good phase margin, if the ESR is
zero when the ESR is at its minimum, it should not be above the internal compensation poles at 24 kHz and
54 kHz.
The selected output capacitor must also be rated for a voltage greater than the desired output voltage plus one
half the ripple voltage. Any derating amount must also be included. The maximum RMS ripple current in the
output capacitor is given by Equation 11:
Where:
NC is the number of output capacitors in parallel.
FSW is the switching frequency.
For this design example, a single 100-
μF output capacitor is chosen for C3. The calculated RMS ripple current is
143 mA and the maximum ESR required is 88 m
. A capacitor that meets these requirements is a AVX
TPSD107M010R0080, rated at 10 V with a maximum ESR of 80 m
and a ripple current rating of 1.369 A. This
capacitor results in a peak-to-peak output ripple of 26 mV using equation 10. An additional small 0.1-
μF ceramic
bypass capacitor may also used, but is not included in this design.
Other capacitor types can be used with the TPS5420, depending on the needs of the application.
Copyright 2006–2007, Texas Instruments Incorporated
13
Product Folder Link(s): TPS5420
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TPS5420D | 制造商:Texas Instruments 功能描述:Linear Voltage Regulator IC |
| TPS5420DG4 | 功能描述:直流/直流開關(guān)調(diào)節(jié)器 5.5 to 36V 2A Step Down Swift Conv RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關(guān)頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| TPS5420D-P | 制造商:Rochester Electronics LLC 功能描述: 制造商:Texas Instruments 功能描述: |
| TPS5420DR | 功能描述:直流/直流開關(guān)調(diào)節(jié)器 5.5 to 36V 2A Step Down Swift Conv RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關(guān)頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| TPS5420DRG4 | 功能描述:直流/直流開關(guān)調(diào)節(jié)器 5.5 to 36V 2A Step Down Swift Conv RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關(guān)頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
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