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参数资料
| 型号： | TPS54233DG4 |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | 2 A SWITCHING REGULATOR, 390 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封装： | GREEN, PLASTIC, MS-012AA, SOIC-8 |
| 文件页数： | 6/25页 |
| 文件大小： | 789K |
| 代理商： | TPS54233DG4 |
ggm
REF
DC
O
V
G
=
V
(
)
PO
OO
Z
V
= 1/ 2
R
C
p
(
)
Z1
Z
F
= 1/ 2
R
C
p
(
)
P1
Z
P
F
= 1/ 2
R
C
p
O
SENSE
ESR
R
Gain = 20 log
20 log
R
-
÷
÷
è
è
(
)
(
)
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
SLUS859B
– OCTOBER 2008 – REVISED FEBRUARY 2011
The dc gain is determined by Equation 15:
(15)
Where:
Vggm = 800
VREF = 0.8 V
The low-frequency pole is determined by Equation 16:
(16)
The mid-frequency zero is determined by Equation 17:
(17)
And, the mid-frequency pole is given by Equation 18:
(18)
The first step is to choose the closed loop crossover frequency. In general, the closed-loop crossover frequency
should be less than 1/8 of the minimum operating frequency, but for the TPS54233it is recommended that the
maximum closed loop crossover frequency be not greater than 25 kHz. Next, the required gain and phase boost
of the crossover network needs to be calculated. By definition, the gain of the compensation network must be the
inverse of the gain of the modulator and output filter. For this design example, where the ESR zero is less than
the closed loop crossover frequency, the gain of the modulator and output filter can be approximated by
(19)
Where:
RSENSE = 1/9
RO = VO/IO
RESR = Equivalent series resistance of the output capacitor
The phase loss is given by Equation 20:
(20)
Where:
RESR = Equivalent series resistance of the output capacitor
RO = VO/IO
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)
14
2008–2011, Texas Instruments Incorporated
Product Folder Link(s): TPS54233
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| TPS54233DRG4 | 功能描述:直流/直流开关转换器 28V,2A,300khZ Non- Synch Buck RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
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| TPS54233QDRQ1 | 功能描述:开关变换器、稳压器与控制器 AC 3.5-28Vin,2A 300kHz SD Converter RoHS:否 制造商:Texas Instruments 输出电压:1.2 V to 10 V 输出电流:300 mA 输出功率: 输入电压:3 V to 17 V 开关频率:1 MHz 工作温度范围: 安装风格:SMD/SMT 封装 / 箱体:WSON-8 封装:Reel |
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