參數(shù)資料
型號： TPS54233DG4
廠商： TEXAS INSTRUMENTS INC
元件分類： 穩(wěn)壓器
英文描述： 2 A SWITCHING REGULATOR, 390 kHz SWITCHING FREQ-MAX, PDSO8
封裝： GREEN, PLASTIC, MS-012AA, SOIC-8
文件頁數(shù)： 7/25頁
文件大小： 789K
代理商： TPS54233DG4
k
F
CO
P
=
1
O
OA
Z
COMP
ggm
REF
ESR
V
R
0.98
R
=
GM
V
R
z
Z
R
F
C
=
1
2
1
p
z
P
R
F
C
=
1
2
1
p
6
2.5
8.696
10
0.98
Rz =
= 30.5 k
9
800
0.8
0.160
W
1
=
= 237 pF
2
22000
30500
Cz
p
1
=
= 237 pF
2
22000
30500
Cp
p
SLUS859B
– OCTOBER 2008 – REVISED FEBRUARY 2011
(24)
The low-frequency pole is set so that the gain at the crossover frequency is equal to the inverse of the gain of the
modulator and output filter. Due to the relationships established by the pole and zero relationships, the value of
RZ can be derived directly by Equation 25 :
(25)
Where:
VO = Output voltage
ROA = 8.696 M
GMCOMP = 9 A/V
Vggm = 800
VREF = 0.8 V
RESR = Equivalent series resistance of the output capacitor
With RZ known, CZ and CP can be calculated using Equation 26 and Equation 27:
(26)
(27)
For this design, a singe 470
μF output capacitor is used. The ESR is approximately .160 . The desired closed
loop crossover frequency is 22000 Hz.
Using Equation 19 and Equation 20, the output stage gain and phase loss are equivalent as:
Gain =
–3.114 dB
and
PL =
–4.96 degrees
For 60 degrees of phase margin, Equation 21 requires no additional phase boost, so K can be set equal to 1.
Equation 22, Equation 23, and Equation 24 are used to find the zero and pole frequencies of:
FZ1 = 22000 Hz
And
FP1 = 22000 Hz
RZ, CZ, and CP are calculated using Equation 25, Equation 26, and Equation 27:
(28)
(29)
(30)
Using standard values for R3, C6, and C7 in the application schematic of Figure 12:
R3 = 30.9 k
C6 = 220 pF
2008–2011, Texas Instruments Incorporated
15
Product Folder Link(s): TPS54233
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