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型號(hào)：	RC5230
文件頁(yè)數(shù)：	737/1328頁(yè)
文件大?。?/td>	9519K
代理商：	RC5230

PRODUCT SPECIFICATION

PCB Layout Guidelines

￥ Placement of the MOSFETs relative to the RC5057 is

critical. Place the MOSFETs such that the trace length of

the HIDRV and LODRV pins of the RC5057 to the FET

gates is minimized. A long lead length on these pins will

cause high amounts of ringing due to the inductance of the

trace and the gate capacitance of the FET. This noise radiates

throughout the board, and, because it is switching at such

a high voltage and frequency, it is very difTcult to suppress.

￥ In general, all of the noisy switching lines should be kept

away from the quiet analog section of the RC5057. That

is, traces that connect to pins 7, 9, 10, and 8 (LODRV,

HIDRV, SW and VCCP) should be kept far away from the

traces that connect to pins 3 through 5, and pin 11.

￥ Place the 0.1μF decoupling capacitors as close to the

RC5057 pins as possible. Extra lead length on these

reduces their ability to suppress noise.

￥ Each VCC and GND pin should have its own via to the

appropriate plane. This helps provide isolation between pins.

￥ Place the MOSFETs, inductor, and Schottky as close

together as possible for the same reasons as in the Trst

bullet above. Place the input bulk capacitors as close to

the drains of the high side MOSFETs as possible. In

addition, placement of a 0.1μF decoupling cap right on

the drain of each high side MOSFET helps to suppress

some of the high frequency switching noise on the input

of the DC-DC converter.

￥ Place the output bulk capacitors as close to the CPU as

possible to optimize their ability to supply instantaneous

current to the load in the event of a current transient.

Additional space between the output capacitors and the

CPU will allow the parasitic resistance of the board traces

to degrade the DC-DC converters performance under

severe load transient conditions, causing higher voltage

deviation. For more detailed information regarding

capacitor placement, refer to Application Bulletin AB-5.

￥ A PC Board Layout Checklist is available from Fairchild

Applications. Ask for Application Bulletin AB-11.

PC Motherboard Sample Layout and Gerber File

A reference design for motherboard implementation of the

RC5057 along with the PCAD layout Gerber file and silk

screen can be obtained from our marketing department at

650-966-7624.

RC5057 Evaluation Board

Fairchild provides an evaluation board to verify the system

level performance of the RC5057. It serves as a guide to per-

formance expectations when using the supplied external

components and PCB layout. Please call the marketing

department at 650-966-7624 for an evaluation board.

Additional Information

For additional information contact Fairchild Semiconductor’s

Analog & Mixed Signal Products Group Marketing Department

at 650-966-7624.

Worst-Case Formulae for the Calculation of

(Circuit of Figure 1 Only)

The following formulae design the RC5057 for worst-case

operation, including initial tolerance and temperature depen-

dence of all of the IC parameters (initial setpoint, reference

tolerance and tempco, active droop tolerance, current sensor

gain), the initial tolerance and temperature dependence of

the MOSFET, and the ESR of the capacitors. The following

information must be provided:

, the value of the positive transient voltage limit;

|, the absolute value of the negative transient voltage limit;

, the maximum output current;

, the nominal output voltage;

, the input voltage (typically 5V);

ESR, the ESR of the output caps, per cap (44m

Sanyo parts shown in this datasheet);

, the on-resistance of the MOSFET (20m

, the tolerance of the current sensor (usually about 67%

for MOSFET sensing, including temperature).

, the rms current rating of the input caps (2A for the

Sanyo parts shown in this datasheet).

Number of capacitors needed for C

= the greater of:

18 * R5 * 1.1

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相關(guān)代理商/技術(shù)參數(shù)	參數(shù)描述
RC524L/R	制造商:Rochester Electronics LLC 功能描述:
RC529F/R	制造商:Rochester Electronics LLC 功能描述:
RC-532 SKN1-DF	制造商:Cooler Master Co., Ltd. 功能描述:DEFECTIVE - Bulk
RC-532-SKN1-DF	制造商:Cooler Master Co., Ltd. 功能描述:DEFECTIVE - Bulk
RC-532-SKN1-OW	制造商:Cooler Master Co., Ltd. 功能描述:OUT OF WARRANTY - Bulk

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