- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄98283 > TPS54418RTER (TEXAS INSTRUMENTS INC) 6.4 A SWITCHING REGULATOR, 2000 kHz SWITCHING FREQ-MAX, PQCC16 PDF資料下載
參數(shù)資料
| 型號： | TPS54418RTER |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 6.4 A SWITCHING REGULATOR, 2000 kHz SWITCHING FREQ-MAX, PQCC16 |
| 封裝： | 3 X 3 MM, GREEN, PLASTIC, WQFN-16 |
| 文件頁數(shù)： | 16/35頁 |
| 文件大?。?/td> | 1356K |
| 代理商： | TPS54418RTER |
第1頁第2頁第3頁第4頁第5頁第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頁當(dāng)前第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頁第29頁第30頁第31頁第32頁第33頁第34頁第35頁
(
)
(
)
(
)
(
)
(
)
(
)
Voutmax
1
Offtimemax
Fsmax
Vinmin
Ioutmax
2
RDS
Ioutmax
RL
RDS
=
-
-
-
+
p
Iout m ax
p m od =
2
Vout
Cout
p
1
z m od =
2
Resr
Cout
C =
p mod
z mod
C
sw
=
p mod
2
gm
2 × c
Vo
Co
R3 =
Gm
Vref
VI
p
Ro
Co
C3 =
R3
www.ti.com
SLVS946A – MAY 2009 – REVISED MAY 2010
Where:
Voutmax = maximum achieveable output voltage
Offtimeman = maximum off time (60 nsec typical)
Fsmax = maximum switching frequency including tolerance
Vinmin = minimum input voltage
Ioutmax = maximum load current
RDS = maximum high side MOSFET on resistance (60 - 70 m
)
RL = series resistance of output inductor
(33)
COMPENSATION
There are several industry techniques used to compensate DC/DC regulators. The method presented here is
easy to calculate and yields high phase margins. For most conditions, the regulator has a phase margin between
60 and 90 degrees. The method presented here ignores the effects of the slope compensation that is internal to
the TPS54418. Since the slope compensation is ignored, the actual cross over frequency is usually lower than
the cross over frequency used in the calculations. Use SwitcherPro software for a more accurate design.
To get started, the modulator pole, fpmod, and the esr zero, fz1 must be calculated using Equation 34 and
Equation 12. For Cout, derating the capacitor is not needed as the 1.8 V output is a small percentage of the 10 V
capacitor rating. If the output is a high percentage of the capacitor rating, use the capacitor manufacturer
information to derate the capacitor value. Use Equation 36 and Equation 37 to estimate a starting point for the
crossover frequency, fc. For the example design, fpmod is 8.04 kHz and fzmod is 2412 kHz. Equation 36 is the
geometric mean of the modulator pole and the esr zero and Equation 37 is the mean of modulator pole and the
switching frequency. Equation 36 yields 139 kHz and Equation 37 gives 63 kHz. Use the lower value of
Equation 36 or Equation 37 as the maximum crossover frequency. For this example, fc is 35 kHz. Next, the
compensation components are calculated. A resistor in series with a capacitor is used to create a compensating
zero. A capacitor in parallel to these two components forms the compensating pole (if needed).
(34)
(35)
(36)
(37)
The compensation design takes the following steps:
1. Set up the anticipated cross-over frequency. Use Equation 38 to calculate the compensation network’s
resistor value. In this example, the anticipated cross-over frequency (fc) is 35 kHz. The power stage gain
(gmps) is 13 A/V and the error amplifier gain (gmea) is 225 mA/V.
(38)
2. Place compensation zero at the pole formed by the load resistor and the output capacitor. The compensation
network’s capacitor can be calculated from Equation 39.
(39)
3. An additional pole can be added to attenuate high frequency noise. In this application, it is not necessary to
add it.
From the procedures above, the compensation network includes a 7.5 k
resistor and a 2700 pF capacitor.
Copyright 2009–2010, Texas Instruments Incorporated
23
Product Folder Link(s): TPS54418
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| TPS54426PWP | 7.5 A SWITCHING REGULATOR, 700 kHz SWITCHING FREQ-MAX, PDSO14 |
| TPS54429PWP | 0.01 A SWITCHING REGULATOR, 700 kHz SWITCHING FREQ-MAX, PDSO14 |
| TPS5450MDDAREP | 11.7 A SWITCHING REGULATOR, 600 kHz SWITCHING FREQ-MAX, PDSO8 |
| TPS54519RTER | 8 A SWITCHING REGULATOR, 2000 kHz SWITCHING FREQ-MAX, PQCC16 |
| TPS54612MPWPREP | 12 A SWITCHING REGULATOR, 700 kHz SWITCHING FREQ-MAX, PDSO28 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TPS54418RTERG4 | 制造商:Texas Instruments 功能描述: |
| TPS54418RTET | 功能描述:直流/直流開關(guān)調(diào)節(jié)器 2.95-6Vin 4A 2MHz Synch St Down 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 |
| TPS54424RNVT | 功能描述:4.5V TO 17V INPUT, CURRENT MODE, 制造商:texas instruments 系列:SWIFT?? 包裝:剪切帶（CT） 零件狀態(tài):在售 功能:降壓 輸出配置:正 拓?fù)?降壓 輸出類型:可調(diào)式 輸出數(shù):1 電壓 - 輸入（最小值）:4.5V 電壓 - 輸入（最大值）:17V 電壓 - 輸出（最小值/固定）:0.6V 電壓 - 輸出（最大值）:12V 電流 - 輸出:4A 頻率 - 開關(guān):200kHz ~ 1.6MHz 同步整流器:是 工作溫度:-40°C ~ 150°C（TJ） 安裝類型:表面貼裝 封裝/外殼:18-VFQFN 供應(yīng)商器件封裝:18-VQFN-HR（3.5x3.5） 標(biāo)準(zhǔn)包裝:1 |
| TPS54425 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:4-A OUTPUT SINGLE SYNCHRONOUS STEP DOWN SWITCHER WITH INTEGRATED FET ( SWIFT?) |
| TPS54425_10 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:4-A OUTPUT SINGLE SYNCHRONOUS STEP DOWN SWITCHER WITH INTEGRATED FET ( SWIFT?) |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。