參數(shù)資料
型號(hào)： AN-53
廠商： Fairchild Semiconductor Corporation
元件分類： DC/DC變換器
英文描述： Implementing an RC5051 DC-DC Converter on Pentium II Motherboards
中文描述： 推行RC5051的DC - DC轉(zhuǎn)換器的奔騰II主板
文件頁(yè)數(shù)： 6/20頁(yè)
文件大?。?/td> 143K
代理商： AN-53
AN53
APPLICATION NOTE
6
Table 4. RC5051 Application Bill of Materials for Intel Pentium II Processors
Notes:
1. Inductor L1 is recommended to isolate the 5V input supply from noise generated by the MOSFET switching, and to comply
with Intel dI/dt requirements. If used, it must be sized to avoid saturation at maximum input current. L1 may be omitted if
desired.
2. For 14.2A designs using the FDP6030L MOSFETs, heatsinks with thermal resistance
Q
SA
<20
°
C/W should be used. For de-
tails and a spreadsheet on MOSFET selections, refer to Applications Bulletin AB-8.
Table 5. Recommended Values for CPU-based Applications
Reference
C1-3, C6-8
C4-5
C
ext
C
IN
Manufacturer’s Part #
Quantity
6
2
1
*
Description
Requirements/Comments
100nF, 50V Capacitor
1
m
F 16V Capacitor
100pF Capacitor
1200
m
F, 10V electrolytic
5%, C0G
I
RMS
= 2A
*See Table 5
ESR < 44m
W
*See Table 5
5%
Sanyo
10MV1200GX
Sanyo
6MV1500GX
Motorola
1N4735A
Motorola
IN5820
C
OUT
*
1500
m
F, 6.3V electrolytic
D1
1
6.2V Zener Diode
D2
1
3A Schottky Diode
L1
L2
1
1
2.5
m
H Inductor
1.3
m
H Inductor
DCR < 6m
W
1
DCR < 3m
W
Elytone
YT-6542
Fairchild
FDP6030L or FDB6030L
Q1-2
2
N-channel MOSFET
R
DS, ON
= 20mW @
V
GS
= 4.5V
2
1/10W
1/10W
*See Table 5
R1
R2-3
R
SENSE
1
2
1
47
W
4.7
W
CuNi Alloy Wire Resistor
Fairchild
RC10-XX
Fairchild
RC5051M
U1
1
DC/DC Controller
Application
Output
Current
13A
C
IN
C
OUT
C
OUT
Maximum
ESR
6.1m
W
R
SENSE
300MHz AMD K6
Motherboard
3 x 1200
m
F, 10V
Sanyo
10MV1200GX
3 x 1200
m
F, 10V
Sanyo
10MV1200GX
3 x 1200
m
F, 10V
Sanyo
10MV1200GX
7 x 1500
m
F, 6.3V
Sanyo
6MV1500GX
7 x 1500
m
F, 6.3V
Sanyo
6MV1500GX
7 x 1500
m
F, 6.3V
Sanyo
6MV1500GX
5.8m
W
300MHz Intel Pentium II
Klamath Motherboard
14.2A
6.8m
W
5.2m
W
300MHz Intel Pentium II
Deschutes Motherboard
12.6A
5.3m
W
5.8m
W
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