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| 型号： | AN-53 |
| 厂商： | Fairchild Semiconductor Corporation |
| 元件分类： | DC/DC变换器 |
| 英文描述： | Implementing an RC5051 DC-DC Converter on Pentium II Motherboards |
| 中文描述： | 推行RC5051的DC - DC转换器的奔腾II主板 |
| 文件页数： | 5/20页 |
| 文件大小： | 143K |
| 代理商： | AN-53 |
APPLICATION NOTE
AN53
5
In general, a higher operating frequency decreases the peak
ripple current flowing in the output inductor, thus allowing
the use of a smaller inductor value. operation at higher fre-
quencies also decreases the amount of energy storage that
must be provided by the bulk output capacitors during load
transients.
Unfortunately, the efficiency losses due to switching of the
MOSFETs increase as the operating frequency is increased.
Thus, efficiency is optimized at lower operating frequencies.
An operating frequency of 300 kHz was chosen in this
Application Note to optimize efficiency while maintaining
excellent regulation and transient performance under all
operating conditions.
Design Considerations and Component
Selection
Figure 3 illustrates a synchronous application using the
RC5051.
Figure 3. Synchronous DC-DC Converter Application Schematic Using the RC5051
VID3
VID2
VID1
VID0
8
7
6
5
4
3
2
1
9
10
11
12
13
14
15
16
17
18
19
20
+5V
PWRGD
RC5051
VCC
ENABLE
C7
0.1
m
F
C8
0.1
m
F
10K
C
100pF
C3
0.1
m
F
CIN
*
R1
47
C5
1
m
F
L1
2.5
m
H
VREF
C1
C2
0.1
m
F
0.1
m
F
+12V
VID4
R4
65-5051-03
*Refer to Table 3 for values of
R
SENSE
, C
OUT
, and C
IN
.
VO
D2
1N5820
COUT
*
L2
2.3
μ
H
R
SENSE
*
4.7
Q2
Q1
D1
1N4735A
C6
0.1
m
F
m
F
4.7
R2
R3
1
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