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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)： | 8/33頁 |
| 文件大?。?/td> | 1269K |
| 代理商： | TPS54519RTER |
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VSENSE
COMP
VO
R1
R3
C1
C2
R2
CO RO
gm
250 A/V
Power Stage
19 A/V
PH
RESR
COUT
RL
b
a
c
0.6 V
VO
RL
VC
fp
fz
Adc
gmps
RESR
COUT
s
1+
2 ×
z
vo
= Adc
vc
s
1+
2 ×
p
÷
p
è
÷
p
è
ps
L
Adc = gm
R
SLVSAT3
– SEPTEMBER 2011
Figure 24. Small Signal Model for Loop Response
SIMPLE SMALL SIGNAL MODEL FOR PEAK CURRENT MODE CONTROL
Figure 24 is a simple small signal model that can be used to understand how to design the frequency
compensation. The TPS54519 power stage can be approximated to a voltage controlled current source (duty
cycle modulator) supplying current to the output capacitor and load resistor. The control to output transfer
function is shown in Equation 11 and consists of a dc gain, one dominant pole and one ESR zero. The quotient
of the change in switch current and the change in COMP pin voltage (node c in Figure 24) is the power stage
transconductance. The gm for the TPS54519 is 19 A/V. The low frequency gain of the power stage frequency
response is the product of the transconductance and the load resistance as shown in Equation 12. As the load
current increases and decreases, the low frequency gain decreases and increases, respectively. This variation
with load may seem problematic at first glance, but the dominant pole moves with load current [see Equation 13].
The combined effect is highlighted by the dashed line in the right half of Figure 25. As the load current
decreases, the gain increases and the pole frequency lowers, keeping the 0-dB crossover frequency the same
for the varying load conditions which makes it easier to design the frequency compensation.
Figure 25. Simple Small Signal Model and Frequency Response for Peak Current Mode Control
(11)
(12)
16
Copyright
2011, Texas Instruments Incorporated
Product Folder Link(s): TPS54519
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TPS54519RTET | 功能描述:直流/直流開關(guān)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(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 |
| 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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