FAN50FC3 datasheet(9/21 Pages) FAIRCHILD

Part #	FAN50FC3

Description	8-Bit Programmable, 2- to 3-Phase FastvCore??Buck Controller

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Manufacturer	FAIRCHILD [Fairchild Semiconductor]

Direct Link	http://www.fairchildsemi.com

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FAN50FC3 Rev. 1.0.0

9 of 21

Test Diagrams

8

8 Bit

Code

12 V

1.25 V

20k

100nF

1k

250k

10nF

SW1

SW2

SW3

VID0

VID1

VID2

VID7

VID6

VID5

VID4

VID3

VCC

EN

VIDSEL

CSCOMP

CSSUM

SS

CSREF

FB

COMP

DELAY

ILIMIT

GND

FBRTN

V

CSCOMP

CSREF

CSSUM

VCC

GND

CSA

12 V

39k

100nF

1k

1 V

+

-

+

-

23

13

12

11

14

Figure 3. Closed-Loop Output Voltage Accuracy

Figure 4. Current-Sense Amplifier VOS

COMP

CSCOMP

FB

VCC

CSREF

12 V

10k

23

5

4

13

11

V

+

-

GND

V

+

-

14

V

dV

Rt as a function of Oscillator Frequency

10

100

1000

0

1000

2000

3000

4000

5000

Oscillator Frequency (kHz)

Figure 5. Droop Voltage Accuracy

Figure 6. RT Required to Set Oscillator Frequency

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Manufacturer	Part #	Datasheet	Description
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FAN50FC3 Datasheet(PDF) 9 Page - Fairchild Semiconductor

FAN50FC3 Datasheet(HTML) 9 Page - Fairchild Semiconductor

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