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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)： | 9/35頁 |
| 文件大?。?/td> | 1356K |
| 代理商： | TPS54418RTER |
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p
OUT
L
1
p =
C
R
2
p
OUT
ESR
1
z =
C
R
2
Vref
VO
R1
R3
C1
C 2
R 2
CO
5pF
RO
gmea
COMP
VSENSE
Type 2A
Type 2B
R 3
C1
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
p
OUT
ea
ps
2 × c
Vo
C
R3 =
gm
Vref
gm
p
OUT
L
1
p =
C
R
2
L
OUT
R
C
C1 =
R3
www.ti.com
SLVS946A – MAY 2009 – REVISED MAY 2010
(9)
(10)
SMALL SIGNAL MODEL FOR FREQUENCY COMPENSATION
The TPS54418 uses a transconductance amplifier for the error amplifier and readily supports two of the
commonly used frequency compensation circuits. The compensation circuits are shown in Figure 32. The Type 2
circuits are most likely implemented in high bandwidth power supply designs using low ESR output capacitors. In
Type 2A, one additional high frequency pole is added to attenuate high frequency noise.
Figure 32. Types of Frequency Compensation
The design guidelines for TPS54418 loop compensation are as follows:
1. Tthe modulator pole, fpmod, and the esr zero, fz1 must be calculated using Equation 11 and Equation 12.
Derating the output capacitor (COUT) may be needed if the output voltage is a high percentage of the
capacitor rating. Use the capacitor manufacturer information to derate the capacitor value. Use Equation 13
and Equation 14 to estimate a starting point for the crossover frequency, fc. Equation 13 is the geometric
mean of the modulator pole and the esr zero and Equation 14 is the mean of modulator pole and the
switching frequency. Use the lower value of Equation 13 or Equation 14 as the maximum crossover
frequency.
(11)
(12)
(13)
(14)
2. R3 can be determined by
(15)
Where is the gmea amplifier gain (225 mA/V), gmps is the power stage gain (13 A/V).
3. Place a compensation zero at the dominant pole
. C1 can be determined by
(16)
4. C2 is optional. It can be used to cancel the zero from Co’s ESR.
Copyright 2009–2010, Texas Instruments Incorporated
17
Product Folder Link(s): TPS54418
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相關代理商/技術參數(shù) |
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| TPS54418RTERG4 | 制造商:Texas Instruments 功能描述: |
| TPS54418RTET | 功能描述:直流/直流開關調節(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 拓撲:降壓 輸出類型:可調式 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: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 供應商器件封裝:18-VQFN-HR（3.5x3.5） 標準包裝: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?) |
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