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| 型号： | TPS54331DDAR |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | 2 A SWITCHING REGULATOR, 684 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封装： | PLASTIC, MS-012BA, SOP-8 |
| 文件页数： | 6/27页 |
| 文件大小： | 794K |
| 代理商： | TPS54331DDAR |
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(
)
SENSE
CO
O
Gain =
20 log 2
R
F
C
p
-
(
)
(
)
CO
ESR
O
CO
O
PL =
tan 2
F
R
C
tan 2
F
R
C
a
p
-
(
)
90 deg
PB = PM
PL
-
÷
è
+
=
deg
45
2
tan
PB
k
F
CO
Z
=
1
k
F
CO
P
=
1
CO
O
OA
Z
ICOMP
ggm
REF
2 ×
× F
× V
× C
× R
R
=
GM
× V
p
SLVS839C – JULY 2008 – REVISED MARCH 2010
www.ti.com
(19)
Where:
RSENSE = 1/12
FCO = Closed-loop crossover frequency
CO = Output capacitance
The phase loss is given by Equation 20:
(20)
Where:
RESR = Equivalent series resistance of the output capacitor
RO = VO/IO
The measured overall loop response for the circuit is given in Figure 20. Note that the actual closed loop
crossover frequency is higher than intended at about 25 kHz. This is primarily due to variation in the actual
values of the output filter components and tolerance variation of the internal feed-forward gain circuitry. Overall
the design has greater than 60 degrees of phase margin and will be completely stable over all combinations of
line and load variability.
Now that the phase loss is known the required amount of phase boost to meet the phase margin requirement
can be determined. The required phase boost is given by Equation 21:
(21)
Where PM = the desired phase margin.
A zero / pole pair of the compensation network will be placed symmetrically around the intended closed loop
frequency to provide maximum phase boost at the crossover point. The amount of separation can be determined
(22)
(23)
(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
(25)
Where:
VO = Output voltage
CO = Output capacitance
FCO = Desired crossover frequency
ROA = 8 M
GMCOMP = 12 A/V
Vggm = 800
VREF = 0.8 V
14
Copyright 2008–2010, Texas Instruments Incorporated
Product Folder Link(s): TPS54331
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