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參數(shù)資料
| 型號： | TPS54519RTER |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 8 A SWITCHING REGULATOR, 2000 kHz SWITCHING FREQ-MAX, PQCC16 |
| 封裝： | 3 X 3 MM, GREEN, PLASTIC, WQFN-16 |
| 文件頁數(shù)： | 9/33頁 |
| 文件大小： | 1269K |
| 代理商： | TPS54519RTER |
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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
OUT
Resr
C
C2 =
R3
SLVSAT3
– SEPTEMBER 2011
(13)
(14)
SMALL SIGNAL MODEL FOR FREQUENCY COMPENSATION
The TPS54519 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 26. 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 26. Types of Frequency Compensation
The design guidelines for TPS54519 loop compensation are as follows:
1. The modulator pole, fpmod, and the esr zero, fz1 must be calculated using Equation 15 and Equation 16.
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 17
and Equation 18 to estimate a starting point for the crossover frequency, fc. Equation 17 is the geometric
mean of the modulator pole and the esr zero and Equation 18 is the mean of modulator pole and the
switching frequency. Use the lower value of Equation 17 or Equation 18 as the maximum crossover
frequency.
(15)
(16)
(17)
(18)
2. R3 can be determined by
(19)
Where is the gmea amplifier gain (250 μA/V), gmps is the power stage gain (19 A/V).
3. Place a compensation zero at the dominant pole
. C1 can be determined by
(20)
4. C2 is optional. It can be used to cancel the zero from Co
’s ESR.
(21)
Copyright
2011, Texas Instruments Incorporated
17
Product Folder Link(s): TPS54519
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| TPS54519RTET | 功能描述:直流/直流開關調(diào)節(jié)器 2.95-6VIN,5A SYNC 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(shù)量: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| TPS54521 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:4.5V to 17V Input, 5A Synchronous Step Down SWIFT? Converter |
| TPS54521_1 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:4.5V to 17V Input, 5A Synchronous Step Down SWIFT? Converter |
| TPS54521EVM-607 | 功能描述:電源管理IC開發(fā)工具 TPS54521 Eval Mod RoHS:否 制造商:Maxim Integrated 產(chǎn)品:Evaluation Kits 類型:Battery Management 工具用于評估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V |
| TPS54521RHL | 制造商:TI 制造商全稱:Texas Instruments 功能描述:4.5V to 17V Input, 5A Synchronous Step Down SWIFT? Converter |
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