FP6791C datasheet(2/13 Pages) FITIPOWER

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FP6791C-1.1-FEB-2012

FP6791C

85T

fitipower integrated technology lnc.

Typical Application Circuit

FP6791C

VIN

EXT

VSS

RDUTY

ROSC

CIN

RFB1

RFB2

COUT

VOUT

RDUTY

ROSC

CSP

Figure 2. Typical Application Circuit of FP6791C

External Parts List:

Element Name

Symbol

Application1 :

VIN=5V,VOUT=12V,

Fequency~700kHz

Application2 :

VIN=3.3V, VOUT=10.5V

Frequency~1.1MHz

Inductor

4.7

μH, TDK

Diode

Schottky Diode

Output Capacitor

COUT

μF

Transistor

Power MOS

Oscillation Frequency Setting Resistor

ROSC

180kΩ±1% resistor

120kΩ±1% resistor

Maximum Duty Ratio Setting Resistor

RDUTY

220kΩ±1% resistor

110kΩ±1% resistor

Short-Circuit

Protection

Delay

Setting

Capacitor

CSP

0.1

μF ceramic capacitor

0.1

μF ceramic capacitor

Output Voltage Setting Resistor1

RFB1

8.2kΩ±1% resistor

6.8kΩ±1% resistor

Output Voltage Setting Resistor2

RFB2

750Ω±1% resistor

715Ω±1% resistor

FB Pin Capacitor

CFB

2.2nF ceramic capacitor

1nF ceramic capacitor

Phase Compensation Resistor

56kΩ±1% resistor

100kΩ±1% resistor

Phase Compensation Capacitor

10nF ceramic capacitor

Input Capacitor

CIN

μF ceramic capacitor

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