- 您現在的位置：買賣IC網 > PDF目錄98282 > TPS5430MDDAREPG4 (TEXAS INSTRUMENTS INC) 8.5 A SWITCHING REGULATOR, 600 kHz SWITCHING FREQ-MAX, PDSO8 PDF資料下載
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： | 6/28頁 |
| 文件大小： | 846K |
| 代理商： | TPS5430MDDAREPG4 |
第1頁第2頁第3頁第4頁第5頁當前第6頁第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
L
MIN +
V
OUT(MAX)
V
IN(MAX) *
V
OUT
V
IN(max)
K
IND
I
OUT
F
SW
(4)
I
L(RMS) +
I2
OUT(MAX) )
1
12
V
OUT
V
IN(MAX) *
V
OUT
V
IN(MAX)
L
OUT
F
SW
0.8
2
(5)
I
L(PK) +
I
OUT(MAX) )
V
OUT
V
IN(MAX) *
V
OUT
1.6
V
IN(MAX)
L
OUT
F
SW
(6)
f
CO +
f
LC
2
85 V
OUT
(7)
SLVS911 – MARCH 2009................................................................................................................................................................................................... www.ti.com
Output Filter Components
Two components must be selected for the output filter, L1 and C2. Because the TPS5430 is an internally
compensated device, a limited range of filter component types and values can be supported.
Inductor Selection
To calculate the minimum value of the output inductor, use Equation 4:
KIND is a coefficient that represents the amount of inductor ripple current relative to the maximum output current.
Three things need to be considered when determining the amount of ripple current in the inductor: the
peak-to-peak ripple current affects the output ripple voltage amplitude, the ripple current affects the peak switch
current and the amount of ripple current determines at what point the circuit becomes discontinuous. For designs
using the TPS5430, KIND of 0.2 to 0.3 yields good results. Low output ripple voltages can be obtained when
paired with the proper output capacitor, the peak switch current will be well below the current limit set point and
relatively low load currents can be sourced before discontinuous operation.
For this design example use KIND = 0.2 and the minimum inductor value is calculated to be 12.5 H. The next
highest standard value is 15
H, which is used in this design.
For the output filter inductor it is important that the RMS current and saturation current ratings not be exceeded.
The RMS inductor current can be found from Equation 5:
and the peak inductor current can be determined with Equation 6:
For this design, the RMS inductor current is 3.003 A, and the peak inductor current is 3.31 A. The chosen
inductor is a Sumida CDRH104R-150 15
H. It has a saturation current rating of 3.4 A and a RMS current rating
of 3.6 A, easily meeting these requirements. A lesser rated inductor could be used, however this device was
chosen because of its low profile component height. In general, inductor values for use with the TPS5430 are in
the range of 10
H to 100 H.
Capacitor Selection
The important design factors for the output capacitor are dc voltage rating, ripple current rating, and equivalent
series resistance (ESR). The dc voltage and ripple current ratings cannot be exceeded. The ESR is important
because, along with the inductor ripple current, it determines the amount of output ripple voltage. The actual
value of the output capacitor is not critical, but some practical limits do exist. Consider the relationship between
the desired closed-loop crossover frequency of the design and LC corner frequency of the output filter. Due to
the design of the internal compensation, it is desirable 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, it is assumed that the intended closed loop crossover frequency is between 2590 Hz and 24 kHz and
also below the ESR zero of the output capacitor. Under these conditions, the closed-loop crossover frequency is
related to the LC corner frequency as:
14
Copyright 2009, Texas Instruments Incorporated
Product Folder Link(s): TPS5430-EP
相關PDF資料 |
PDF描述 |
|---|---|
| TPS54310MPWPREP | 6 A SWITCHING REGULATOR, 775 kHz SWITCHING FREQ-MAX, PDSO20 |
| TPS54310PWPRG4 | 6 A SWITCHING REGULATOR, 762 kHz SWITCHING FREQ-MAX, PDSO20 |
| TPS54320RHLR | SWITCHING REGULATOR, 1320 kHz SWITCHING FREQ-MAX, PQCC14 |
| TPS54320RHL | SWITCHING REGULATOR, PQCC14 |
| TPS54327DDAR | 5.7 A SWITCHING REGULATOR, 700 kHz SWITCHING FREQ-MAX, PDSO8 |
相關代理商/技術參數 |
參數描述 |
|---|---|
| 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?) |
發布緊急采購，3分鐘左右您將得到回復。