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参数资料
| 型号： | TPS5431DDA |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | 6 A SWITCHING REGULATOR, 600 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封装： | GREEN, PLASTIC, SOP-8 |
| 文件页数： | 8/28页 |
| 文件大小： | 810K |
| 代理商： | TPS5431DDA |
第1页第2页第3页第4页第5页第6页第7页当前第8页第9页第10页第11页第12页第13页第14页第15页第16页第17页第18页第19页第20页第21页第22页第23页第24页第25页第26页第27页第28页
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VIN10 24V
-
C1
4.7 F
m
L1
15 H
m
R1
10kW
R2
5.9kW
R3
549 W
C6
1500pF
U1
TPS5430DDA
VIN
GND
VSNS
PH
BOOT
PwPd
EN
3.3V
VOUT
C2
0.01 F
m
D1
MRBS340
C3
100 F
m
C7
0.1 F
m
C4
150pF
VIN
7
1
2
4
5
8
3
6
9
ENA
NC
C
(MIN)
O
1
2
(2
x7000)xL
p
O
(13)
F
=
LC
1
2
L
p
O
xC
(EFF)
(14)
SLVS632C – JANUARY 2006 – REVISED NOVEMBER 2006
Figure 14. Ceramic Output Filter Capacitors Circuit
Output Filter Component Selection
Using Equation 11, the minimum inductor value is 12
H. A value of 15 H is chosen for this design.
When using ceramic output filer capacitors, the recommended LC resonant frequency should be no more than
7 kHz. Since the output inductor is already selected at 15
H, this limits the minimum output capacitor value to:
The minimum capacitor value is calculated to be 34
F. For this circuit a larger value of capacitor yields better
transient response. A single 100-
F output capacitor is used for C3. It is important to note that the actual
capacitance of ceramic capacitors decreases with applied voltage. In this example, the output voltage is set to
3.3 V, minimizing this effect.
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, C4, C6, and C7. To determine the value of these components, first
calculate the LC resonant frequency of the output filter:
For this example the effective resonant frequency is calculated as 4109 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:
16
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