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AN-53

更新时间： 2022-11-25 11:11:44

品牌	Logo	应用领域
飞兆/仙童 - FAIRCHILD		转换器 DC-DC转换器
页数	文件大小	规格书
20页	144K
描述
Implementing an RC5051 DC-DC Converter on Pentium II Motherboards

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AN53

APPLICATION NOTE

Table 4. RC5051 Application Bill of Materials for Intel Pentium II Processors

Reference

C1-3, C6-8

C4-5

Manufacturer’s Part #

Quantity

Description

100nF, 50V Capacitor

1mF 16V Capacitor

100pF Capacitor

Requirements/Comments

C_ext

5%, C0G

C_IN

Sanyo

1200mF, 10V electrolytic

I_RMS= 2A

10MV1200GX

*See Table 5

C_OUT

Sanyo

6MV1500GX

1500mF, 6.3V electrolytic

6.2V Zener Diode

ESR < 44mW

*See Table 5

Motorola

1N4735A

Motorola

IN5820

3A Schottky Diode

2.5mH Inductor

1.3mH Inductor

DCR < 6mW¹

DCR < 3mW

Elytone

YT-6542

Q1-2

Fairchild

FDP6030L or FDB6030L

N-channel MOSFET

R_{DS, ON}= 20mW @

V_GS= 4.5V²

1/10W

47W

R2-3

R_SENSE

4.7W

1/10W

Fairchild

CuNi Alloy Wire Resistor

*See Table 5

RC10-XX

Fairchild

DC/DC Controller

RC5051M

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 <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

Application

Output

Current

C_IN

C_OUT

C_OUTMaximum R_SENSE

ESR

300MHz AMD K6

Motherboard

13A

3 x 1200mF, 10V

Sanyo

10MV1200GX

7 x 1500mF, 6.3V

Sanyo

6MV1500GX

6.1mW

6.8mW

5.3mW

5.8mW

5.2mW

5.8mW

300MHz Intel Pentium II 14.2A

Klamath Motherboard

3 x 1200mF, 10V

Sanyo

10MV1200GX

7 x 1500mF, 6.3V

Sanyo

6MV1500GX

300MHz Intel Pentium II 12.6A

Deschutes Motherboard

3 x 1200mF, 10V

Sanyo

7 x 1500mF, 6.3V

Sanyo

10MV1200GX

6MV1500GX

1...3 4 567 8 9...20

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