參數(shù)資料
型號(hào)： TPS54286PWPRG4
廠商： TEXAS INSTRUMENTS INC
元件分類： 穩(wěn)壓器
英文描述： 3.6 A DUAL SWITCHING CONTROLLER, 750 kHz SWITCHING FREQ-MAX, PDSO14
封裝： GREEN, PLASTIC, HTSSOP-14
文件頁(yè)數(shù)： 9/52頁(yè)
文件大?。?/td> 1110K
代理商： TPS54286PWPRG4
www.ti.com
Feedback Loop and Inductor-Capacitor (L-C) Filter Selection
TPS5428x
FB
C
COMP
11.5 kW
+
Error Amplifier
0.8 V
REF
BOOT
SW
+
R
COMP
Offset
f(I
DRAIN
)
PWM to
Switch
I
SLOPE
I
COMP
TPS54283
TPS54286
R
COMP
(kW)
C
COMP
(pF)
700
40
20
UDG-07012
I
COMP
- I
SLOPE
x2
SLUS749C – JULY 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 21.
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 21. Feedback Loop Equivalent Circuit
A more conventional small signal equivalent block diagram is shown in Figure 22. Here, the full closed loop
signal path is shown. Because the TPS5428x 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
Product Folder Link(s): TPS54283 TPS54286
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