參數(shù)資料
型號： TPS54383PWPR
廠商： TEXAS INSTRUMENTS INC
元件分類： 穩(wěn)壓器
英文描述： 7 A DUAL SWITCHING CONTROLLER, 375 kHz SWITCHING FREQ-MAX, PDSO14
封裝： GREEN, PLASTIC, HTSSOP-14
文件頁數(shù)： 13/58頁
文件大?。?/td> 1773K
代理商： TPS54383PWPR
www.ti.com
C
=
OUTmax
t
SS
V
REF
I
CLx
V
- REF(1 +
)
R1
R2
V
REF
(1 +
) TS
R1
R2
2
V
IN
L
R
LOAD
1
+
(1 -
)
(3)
Minimum Output Capacitance
Modifying The Feedback Loop
1
2
3
4
14
13
12
11
PVDD2
BOOT2
SW2
BP
PVDD1
BOOT1
SW1
GND
TPS5438x
5
6
7
10
9
8
SEQ
ILIM2
FB2
EN1
EN2
FB1
R1
OUTPUT1
R2
C1
R3
UDG-07013
C2
SLUS774B – AUGUST 2007 – REVISED OCTOBER 2007
Ensure the value of capacitance selected for closed loop stability is compatible with the requirements of Soft
Within the limits of the internal compensation, there is flexibility in the selection of the inductor and output
capacitor values. A smaller inductor increases ripple current, and raises the resonant frequency, thereby
incerasing the required amount of output capacitance. A smaller capacitor could also be used, increasing the
resonant frequency, and increasing the overall loop bandwidth—perhaps at the expense of adequate phase
margin.
The internal compensation of the TPS54x8x is designed for capacitors with an ESR zero frequency between
20kHz and 60kHz. It is possible, with additional feedback compensation components, to use capacitors with
higher or lower ESR zero frequencies. For either case, the components C1 and R3 (ref.Figure 30 ) are added to
re-compensate the feedback loop for stability. In this configuration a low frequency pole is followed by a higher
frequency zero. The placement of this pole-zero pair is dependent on the type of output capacitor used, and the
desired closed loop frequency response.
Figure 30. Optional Loop Compensation Components
NOTE:
Once the filter and compensation components have been established, laboratory
measurements of the physical design should be performed to confirm converter
stability.
Using High-ESR Output Capacitors
If a high ESR capacitor is used in the output filter, a zero appears in the loop response that could lead to
instability. To compensate, a small R-C series connected network is placed in parallel with the lower voltage
setting divider resistor (Ref Figure 30). The values of the components are determined such that a pole is placed
at the same frequency as the ESR zero and a new zero is placed at a frequency location conducive to good loop
stability.
20
Copyright 2007, Texas Instruments Incorporated
Product Folder Link(s): TPS54383 TPS54386
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
TPS54383PWPRG4 功能描述:直流/直流開關(guān)調(diào)節(jié)器 3A Non-Synch Buck 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
TPS54386 制造商:TI 制造商全稱:Texas Instruments 功能描述:SWIFT Converter Product Portfolio
TPS54386EVM 功能描述:電源管理IC開發(fā)工具 TPS54386 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
TPS54386PWP 功能描述:直流/直流開關(guān)調(diào)節(jié)器 DC/DC Controller 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
TPS54386PWP 制造商:Texas Instruments 功能描述:DC/DC Controller
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