參數(shù)資料
型號(hào)： TPS5410MDREP
廠商： TEXAS INSTRUMENTS INC
元件分類(lèi)： 穩(wěn)壓器
英文描述： 4.6 A SWITCHING REGULATOR, 600 kHz SWITCHING FREQ-MAX, PDSO8
封裝： GREEN, PLASTIC, SOIC-8
文件頁(yè)數(shù)： 7/25頁(yè)
文件大?。?/td> 759K
代理商： TPS5410MDREP
F
=
LC
1
2
L
p
O
xC
(EFF)
Fp1=500000x
VO
FLC
Fz1=0.7xF
LC
Fz2=2.5xF
LC
C7=
1
2
xFp1x(R1||R2)
p
R3=
1
2
xFz1xC7
p
C6=
1
2
xFz2xR1
p
www.ti.com ......................................................................................................................................................................................... SLVS910 – SEPTEMBER 2009
External Compensation Network
When using ceramic output capacitors, additional circuitry is required to stabilize the closed loop system. For this
circuit the external components are R3, C5, C6 and C7. To determine the value of these components, first
calculate the LC resonant frequency of the output filter:
(14)
For this example the effective resonant frequency is calculated as 2306 Hz
The network composed of R1, R2, R3, C5, C6 and C7 has two poles and two zeros that are used to tailor the
overall response of the feedback network to accommodate the use of the ceramic output capacitors. The pole
and zero locations are given by the following equations:
(15)
(16)
(17)
The final pole is located at a frequency too high to be of concern. The values for R1 and R2 are fixed by the 5-V
output voltage as calculated using Equation 12. Now the values of R3, C5, C6 and C7 are determined using
(18)
(19)
(20)
For this design, using the closest standard values, C7 is 0.056
μF, R3 is 1.76 k and C6 is 2700 pF. C5 is
added to improve load regulation performance. It is effectively in parallel with C6 in the location of the second
pole frequency, so it should be small in relationship to C6. C5 should be less the 1/10 the value of C6. For this
example, 150 pF works well.
For additional information on external compensation of the TPS5410 or other wide voltage range SWIFT devices,
see SLVA237 Using TPS5410/20/30/31 With Aluminum/Ceramic Output Capacitors.
Copyright 2009, Texas Instruments Incorporated
15
Product Folder Link(s): TPS5410-EP
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