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參數(shù)資料
| 型號： | TPS5420DR |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 5 A SWITCHING REGULATOR, 600 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封裝： | GREEN, PLASTIC, MS-012AA, SOIC-8 |
| 文件頁數(shù)： | 7/24頁 |
| 文件大?。?/td> | 738K |
| 代理商： | TPS5420DR |
www.ti.com
VIN10 24V
-
C1
4.7 F
m
L1
18 H
m
R1
10kW
R2
5.9kW
R3
549 W
C6
1800pF
U1
TPS5420D
VIN
GND
VSNS
PH
BOOT
PwPd
EN
3.3V
VOUT
C2
0.01 F
m
D1
MRBS340
C4
47 F
m
C7
0.1 F
m
C4
150pF
VIN
7
1
2
4
5
8
3
6
9
ENA
NC
C3
47 F
m
C
(MIN)
O
1
2
(2
x7000)xL
p
O
(13)
F
=
LC
1
2
L
p
O
xC
(EFF)
(14)
SLVS642C – APRIL 2006 – REVISED OCTOBER 2007
Figure 13. Ceramic Output Filter Capacitors Circuit
Output Filter Component Selection
Using Equation 11, the minimum inductor value is 17.9
μH. A value of 18 μH 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 18
μH, this limits the minimum output capacitor value to:
The minimum capacitor value is calculated to be 29
μF. For this circuit a larger value of capacitor yields better
transient response. Two 47
μF output capacitors are used for C3 and C4. 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, C5, 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:
Copyright 2006–2007, Texas Instruments Incorporated
15
Product Folder Link(s): TPS5420
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