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| 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)： | 9/58頁 |
| 文件大?。?/td> | 1773K |
| 代理商： | TPS54383PWPR |
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Feedback Loop and Inductor-Capacitor (L-C) Filter Selection
TPS5438x
FB
C
COMP
11.5k W
+
Error Amplifier
0.8V
REF
BOOT
SW
+
R
COMP
Offset
f(I
DRAIN
)
PWMto
Switch
I
SLOPE
I
COMP
TPS54383
TPS54386
R
COMP
(kW)
C
COMP
(pF)
700
40
20
UDG-07012
I
COMP
-I
SLOPE
x2
SLUS774B – AUGUST 2007 – REVISED OCTOBER 2007
In the feedback signal path, the output voltage setting divider is followed by an internal gM-type error amplifier
with a typical transconductance of 30
S. An internal series connected R-C circuit from the g
M amplifier output 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 in Figure 22.
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. See SW Node
Ringing for further information on reducing noise on the SWx node.
Figure 22. Feedback Loop Equivalent Circuit
A more conventional small signal equivalent block diagram is shown in Figure 23. Here, the full closed loop
signal path is shown. Because the TPS5438x contains internal slope compensation and loop compensation
components, the external L-C filter must be selected appropriately so that the resulting control loop meets criteria
for stability. This approach differs from an externally-compensated controller, where the L-C filter is generally
selected first, and the compensation network is found afterwards. To find the appropriate L and C filter
combination, the Output-to-Vc signal path plots (see the next section) of gain and phase are used along with
other design criterial to aid in finding the combinations that best results in a stable feedback loop.
Copyright 2007, Texas Instruments Incorporated
17
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| 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 |
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| TPS54386PWP | 制造商:Texas Instruments 功能描述:DC/DC Controller |
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