參數(shù)資料
型號(hào)： TPS54290PWP
廠商： TEXAS INSTRUMENTS INC
元件分類： 穩(wěn)壓器
英文描述： 4.6 A DUAL SWITCHING CONTROLLER, 360 kHz SWITCHING FREQ-MAX, PDSO16
封裝： GREEN, PLASTIC, HTSSOP-16
文件頁(yè)數(shù)： 6/35頁(yè)
文件大?。?/td> 1397K
代理商： TPS54290PWP
V
REF
V
IN
V
OUT
Compensation
Network
+
_
Modulator
Filter
Current
Feedback
Network
+
_
V
C
(
)
(
)
ON
SW
TPS5429 x
K t
IN
OUT
6
f
FM
V
19.7
e
95
10
L
-
=
-
÷
+
÷
÷
÷
è
è
(
)
4
IN
C
6
IN
LOAD
V
FM
2
10
f
V
FM
95
10
1
2
R
-
=
÷
÷
+
÷
÷
÷
÷
è
è
(
)
(
)
C
EA
CO
LOAD
OUT
f
K
20 log
1 2
f
2 R
C
÷
= -
÷
+ p
è
SLUS973 – OCTOBER 2009
www.ti.com
Figure 16. Small Signal Equivalent Block Diagram
To determine the components necessary for compensating the feedback loop, the controller frequency response
characteristics must be understood and the desired crossover frequency selected. The best results are obtained
if 10% of the switching frequency is used as this closed loop crossover frequency. In some cases, up to 20% of
the switching frequency is also possible.
With the output filter components selected, the next step is to calculate the DC gain of the modulator. For
TPS5429x:
(5)
where
K = 5.6 ×10
5 for TPS54290
K = 1.5 × 10
6 for TPS54291
K = 3.6 × 10
6 for TPS54292
The overall DC gain of the converter control-to-output transfer function is approximated Equation 6.
(6)
The next step is to find the desired gain of the error amplifier at the desired crossover frequency. Assuming a
single-pole roll-off, us Equation 6 to evaluate the following expression at the desired crossover frequency.
(7)
where
CO is the desired crossover frequency
14
Copyright 2009, Texas Instruments Incorporated
Product Folder Link(s) :TPS54290 TPS54291 TPS54292
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相關(guān)代理商/技術(shù)參數(shù)
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TPS54290PWPR 功能描述:直流/直流開(kāi)關(guān)調(diào)節(jié)器 4.5-18V Dual Sync Step Down Converter RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開(kāi)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
TPS54291 制造商:TI 制造商全稱:Texas Instruments 功能描述:1.5-A/2.5-A Dual, Fully-Synchronous Buck Converter With Integrated MOSFET
TPS54291EVM-431 功能描述:電源管理IC開(kāi)發(fā)工具 Dual Sync Buck Con- verter Eval Mod RoHS:否 制造商:Maxim Integrated 產(chǎn)品:Evaluation Kits 類型:Battery Management 工具用于評(píng)估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V
TPS54291PWP 功能描述:直流/直流開(kāi)關(guān)轉(zhuǎn)換器 4.5-18V Dual Sync Step Down Converter RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開(kāi)關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT
TPS54291PWPR 功能描述:直流/直流開(kāi)關(guān)調(diào)節(jié)器 4.5-18V Dual Sync Step Down Converter RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開(kāi)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
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