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參數(shù)資料
| 型號： | LSP5503SEC |
| 廠商： | LITE-ON SEMICONDUCTOR CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 4 A SWITCHING REGULATOR, 470 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封裝： | SOP-8 |
| 文件頁數(shù)： | 8/12頁 |
| 文件大?。?/td> | 475K |
| 代理商： | LSP5503SEC |
LSP5503
3A Synchronous Step Down DC/DC Converter
5 of 12
Rev. 1.8
Output Capacitor
The output capacitor also needs to have low ESR to keep low output voltage ripple. The output ripple voltage is:
ESR
RIPPLE
OUTMAX
RIPPLE
R
K
I
V
=
OUT
LC
SW
f
IN
V
2
8
+
(3)
where IOUTMAX is the maximum output current, KRIPPLE is the ripple factor, RESR is the ESR of the output capacitor, fSW
is the switching frequency, L is the inductor value, and COUT is the output capacitance. In the case of ceramic output
capacitors, RESR is very small and does not contribute to the ripple. Therefore, a lower capacitance value can be
used for ceramic capacitors. In the case of tantalum or electrolytic capacitors, the ripple is dominated by RESR
multiplied by the ripple current. In that case, the output capacitor is chosen to have sufficiently low ESR.
For ceramic output capacitors, typically choose a capacitance of about 22F. For tantalum or electrolytic capacitors,
choose a capacitor with less than 50m ESR.
Optional Schottky Diode
During the transition between high-side switch and low-side switch, the body diode of the low side power MOSFET
conducts the inductor current. The forward voltage of this body diode is high. An optional Schottky diode may be
paralleled between the SW pin and GND pin to improve overall efficiency. Table 2 lists example Schottky diodes and
their Manufacturers.
VIN = 12V
LSP5503
IN
EN
FB
SW
C1
C2
0.1uF
C5
47pF
C6
10nF
R2
10k
R3
6.8k
COMP
R4
100k
BS
C4
2.2nF
2
7
3
5
1
8
6
SS
0.1uF
C3
4
22uF/16V
10uH/3A
L1
44.2k
C7
22uF/16V
x2
VOUT = 5V/3A
R1
D1
B130/SK13
(Option)
GND
Stability Compensation
CCOMP2 is needed only for high ESR output capacitor
Figure 2. Stability Compensation
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LT1004IDRG4-1-2 | 1-OUTPUT TWO TERM VOLTAGE REFERENCE, 1.235 V, PDSO8 |
| LT1004CLP-2-5 | 1-OUTPUT TWO TERM VOLTAGE REFERENCE, 2.5 V, PBCY3 |
| LT1004IPW-2-5 | 1-OUTPUT TWO TERM VOLTAGE REFERENCE, 2.5 V, PDSO8 |
| LT1004CPWRE4-2-5 | 1-OUTPUT TWO TERM VOLTAGE REFERENCE, 2.5 V, PDSO8 |
| LT1004CDE4-1-2 | 1-OUTPUT TWO TERM VOLTAGE REFERENCE, 1.235 V, PDSO8 |
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