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FP6791C Datasheet Preview

FP6791C Datasheet

PWM Boost DC-DC Controller

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fitipower integrated technology lnc.
FP6791C
PWM Boo8s5tT
DC-DC Controller
Description
The FP6791C is a CMOS step-up switching
controller which incorporates a reference voltage
circuit, an oscillator, an error amplifier, a PWM
controller, an under voltage lockout circuit (UVLO)
and a timer latch short-circuit protection circuit.
The switching frequency can be controlled by the
resistor connected to the ROSC pin, and the
maximum duty ratio can be controlled by the resistor
connected to the RDUTY pin.
In addition, the FP6791C provides adjustable
short-circuit protection delay time with an external
capacitor which is connected to the CSP pin. If the
maximum duty condition continues due to
short-circuiting, the capacitor externally connected to
the CSP pin will be charged, and oscillation will stop
after a specific time. This condition will be cleared
by re-application of power. This controller IC allows
various settings and employs a small package, which
make it easy to use.
Features
Programmed Switching Frequency
Programmed Maximum Duty Ratio
Reference Voltage: 1.0V ±1.5%
UVLO (Under-Voltage Lockout) Function:
Detection Voltage 2.2V
Hysteresis Width 0.3V
Timer Latch Short-Circuit Protection Circuit: Delay
Time Set by an External Capacitor.
Internal Soft-Start Function
External Compensation Network
Small Package: 8-pin TSSOP
RoHS Compliant
Applications
LCD Panel
Portable Equipment
Pin Assignment
TS Package (TSSOP-8)
CC
FB
CSP
VIN
1
2
3
4
8
7
6
5
RDUTY
ROSC
VSS
EXT
Ordering Information
FP6791C□□□
TR: Tape/Reel
G: Green
Package Type
TS: TSSOP-8
Figure 1. Pin Assignment of FP6791C
FP6791C-1.1-FEB-2012
1




Fiti

FP6791C Datasheet Preview

FP6791C Datasheet

PWM Boost DC-DC Controller

No Preview Available !

fitipower integrated technology lnc.
Typical Application Circuit
FP6791C
85T
L1
VIN CIN M1
D1
RDUTY
ROSC
VOUT
RDUTY
VIN
ROSC
FP6791C
EXT
VSS CSP cc
FB
CSP
RZ CZ
CF RFB1
RFB2
COUT
Figure 2. Typical Application Circuit of FP6791C
External Parts List:
Element Name
Inductor
Diode
Output Capacitor
Transistor
Oscillation Frequency Setting Resistor
Maximum Duty Ratio Setting Resistor
Short-Circuit Protection Delay
Capacitor
Output Voltage Setting Resistor1
Setting
Output Voltage Setting Resistor2
FB Pin Capacitor
Phase Compensation Resistor
Phase Compensation Capacitor
Input Capacitor
Symbol
L1
D1
COUT
M1
ROSC
RDUTY
CSP
RFB1
RFB2
CFB
RZ
CZ
CIN
Application1 :
VIN=5V,VOUT=12V,
Fequency~700kHz
4.7μH, TDK
Schottky Diode
40μF
Power MOS
180kΩ±1% resistor
220kΩ±1% resistor
0.1μF ceramic capacitor
8.2kΩ±1% resistor
750Ω±1% resistor
2.2nF ceramic capacitor
56kΩ±1% resistor
10nF ceramic capacitor
10μF ceramic capacitor
Application2 :
VIN=3.3V, VOUT=10.5V
Frequency~1.1MHz
10μH, TDK
Schottky Diode
10μF
Power MOS
120kΩ±1% resistor
110kΩ±1% resistor
0.1μF ceramic capacitor
6.8kΩ±1% resistor
715Ω±1% resistor
1nF ceramic capacitor
100kΩ±1% resistor
10nF ceramic capacitor
10μF ceramic capacitor
FP6791C-1.1-FEB-2012
2


Part Number FP6791C
Description PWM Boost DC-DC Controller
Maker Fiti
Total Page 13 Pages
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