參數(shù)資料
型號(hào)： TPS54291PWPR
廠商： TEXAS INSTRUMENTS INC
元件分類： 穩(wěn)壓器
英文描述： 4.6 A DUAL SWITCHING CONTROLLER, 720 kHz SWITCHING FREQ-MAX, PDSO16
封裝： GREEN, PLASTIC, HTSSOP-16
文件頁(yè)數(shù)： 5/35頁(yè)
文件大小： 1397K
代理商： TPS54291PWPR
SS
RIPPLE
OUT(max)
LOAD
OUT
t
I
C
ILIM
I
V
2
=
-
÷
÷
è
è
FB
11.5 kW
+
Error
Amplifier
0.8 V
REF
BP
GND
+
Offset
f(I
DRAIN)
PWM to
Switch
I
SLOPE
I
COMP
UDG-09128
I
COMP – ISLOPE
x 2
C
COMP
R
COMP
www.ti.com
SLUS973 – OCTOBER 2009
MAXIMUM OUTPUT CAPACITANCE
With internal pulse-by-pulse current limiting and a fixed soft-start time, there is a maximum output capacitance
which may be used before startup problems begin to occur. If the output capacitance is large enough so that the
device enters a current-limit protection mode during startup, then there is a possibility that the output never
reaches regulation. Instead, the TPS5429x simply shuts down and attempts a restart as if the output were
short-circuited to ground. The maximum output capacitance (including bypass capacitance distributed at the
load) is given by
(4)
where
tSS is the soft start time
ILIM is the current limit level
FEEDBACK LOOP COMPENSATION
In the feedback signal path, the output voltage setting divider is followed by an internal gM-type error amplifier
with a typical transconductance of 325 S. An external series connected R-C circuit from the gM amplifier output
(COMPx pin) to ground serves as the compensation network for the converter. The signal from the error amplifier
output is then buffered and combined with a slope compensation signal before it is mirrored to be referenced to
the SW node. Here, it is compared with the current feedback signal to create a pulse-width-modulated (PWM)
signal-fed to drive the upper MOSFET switch. A simplified equivalent circuit of the signal control path is depicted
NOTE
Noise coupling from the SWx node to internal circuitry of BOOTx may impact narrow
pulse width operation, especially at load currents less than 1 A.
Figure 15. Feedback Loop Equivalent Circuit
A more conventional small-signal equivalent block diagram is shown in Figure 16. Here, the full closed-loop
signal path is shown. Because the TPS5429x contains internal slope compensation, the external L-C filter must
be selected appropriately so that the resulting control loop meets criteria for stability.
Copyright 2009, Texas Instruments Incorporated
13
Product Folder Link(s) :TPS54290 TPS54291 TPS54292
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
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TPS54292PWPR 功能描述:直流/直流開關(guān)調(diào)節(jié)器 4.5-18Vin Dual Synch St Down SWIFT Conv 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
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TPS542941 制造商:TI 制造商全稱:Texas Instruments 功能描述:2A/3A Dual Channel Synchronous Step-Down Switcher with Integrated FET
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