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參數資料
| 型號： | TPS5430MDDAREPG4 |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩壓器 |
| 英文描述： | 8.5 A SWITCHING REGULATOR, 600 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封裝： | GREEN, PLASTIC, SOP-8 |
| 文件頁數： | 7/28頁 |
| 文件大小： | 846K |
| 代理商： | TPS5430MDDAREPG4 |
第1頁第2頁第3頁第4頁第5頁第6頁當前第7頁第8頁第9頁第10頁第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁第19頁第20頁第21頁第22頁第23頁第24頁第25頁第26頁第27頁第28頁
C
OUT +
1
3357
L
OUT
f
CO
V
OUT
(8)
ESR
MAX +
1
2p
C
OUT
f
CO
(9)
V
(MAX)=
PP
()
ESR
×V
V
– V
MAX
OUT
IN(MAX)
OUT
×
N
V
L
C
IN(MAX)
OUT
FSW
×
(10)
I
COUT(RMS) +
1
12
V
OUT
V
IN(MAX) *
V
OUT
V
IN(MAX)
L
OUT
F
SW
N
C
(11)
R2 +
R1
1.221
V
OUT *
1.221
(12)
www.ti.com................................................................................................................................................................................................... SLVS911 – MARCH 2009
And the desired output capacitor value for the output filter to:
For a desired crossover of 18 kHz and a 15-
H inductor, the calculated value for the output capacitor is 220 F.
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.
For this design example, a single 220-
F output capacitor is chosen for C3. The calculated RMS ripple current is
143 mA and the maximum ESR required is 40 m
. A capacitor that meets these requirements is a Sanyo
Poscap 10TPB220M, rated at 10 V with a maximum ESR of 40 m
and a ripple current rating of 3 A. An
additional small 0.1-
F ceramic bypass capacitor may also used, but is not included in this design.
The minimum ESR of the output capacitor should also be considered. For good phase margin, the ESR zero
when the ESR is at a minimum should not be too far 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.
Other capacitor types can be used with the TPS5430, depending on the needs of the application.
Output Voltage Setpoint
The output voltage of the TPS5430 is set by a resistor divider (R1 and R2) from the output to the VSENSE pin.
Calculate the R2 resistor value for the output voltage of 5 V using Equation 12:
For any TPS5430 design, start with an R1 value of 10 k
. R2 is then 3.24 k.
Boot Capacitor
The boot capacitor should be 0.01
F.
Copyright 2009, Texas Instruments Incorporated
15
Product Folder Link(s): TPS5430-EP
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相關代理商/技術參數 |
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| TPS5430-Q1 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:3-A WIDE-INPUT-RANGE STEP-DOWN SWIFT CONVERTER |
| TPS5430QDDARQ1 | 功能描述:直流/直流開關調節器 3A Wide-Input-Range Step-Down Converter RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數量: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| TPS5431 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:1.6 MHz, 3-V TO 6-V INPUT, 3-A SYNCHRONOUS STEP-DOWN SWIFT⑩ CONVERTER WITH DISABLED SINKING DURING START-UP |
| TPS54310 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:3-V TO 6-V INPUT, 3-A OUTPUT SYNCHRONOUS-BUCK PWM SWITCHER WITH INTEGRATED FETs |
| TPS54310-EP | 制造商:TI 制造商全稱:Texas Instruments 功能描述:3-V TO 6-V INPUT, 3-A OUTPUT,SYNCHRONOUS BUCK PWM SWITCHER WITH INTEGRATED FETs(SWIFT?) |
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