FA5550 Fuji Electric holdings CO.,Ltd, FA5550 Datasheet - Page 12

• Manufacturer Part Number: FA5550
• Description: Power Factor Correction Converter
• Manufacturer: Fuji Electric holdings CO.,Ltd

(5) No.5 pin (SLOPE pin)
Function:
(a) SLOPE compensation of IS pin
How to use:
(a) SLOPE compensation
・ How to connect:
・ Operation
・ Supplementary explanation
(6) No.6 pin (GND pin)
Function:
This is used as the reference voltage for each part of the IC.
(7) No.7 pin (OUT pin)
Function:
Driving of MOSFET
How to use:
・ How to connect:
・ Operation
・ Supplementary explanation
Rev.1 Feb-2008
During MOSFET is being off, this is in the state of “Low”, and the
voltage almost equal to 0V is outputted.
Connect a resistor between SLOPE pin and GND, or short
circuit to GND. A SLOPE compensation value with the resistor
connection shall be 0.12(mV/us)/kΩ.
sub-harmonic oscillation is prevented by adding specific
gradient voltage (Slope) to IS pin voltage.
In case of current mode for peak value controls, oscillations
which are integral multiples of the switching frequency may
occur if the circuit is operated in continuouse conduction mode
and duty cycle of 50 percent or more. This is called as
sub-harmonic oscillation.
Connect to the gate pin of MOSFET through a resistor.
During MOSFET is being on, this is in the state of “High”, and
the voltage almost equal to the VCC is outputted.
Connect a gate resistor aiming at current limit of OUT pin and
prevention of oscillations of the gate pin voltage.
The rated output currents of the IC are 1A at the source and 2A
at the sink.
In connections shown in Figures 13 and 14, gate driving
currents of MOSFET for ON and OFF can be set independently.
FA5550 / 51
12
Driver
Driver
Driver
Fuji Electric Device Technology
Fig.13 OUT pin circuit (2)
Fig.12 OUT pin circuit (1)
8
6
8
6
Fig.14 OUT pin circuit (3)
Fig.11 SLOPE pin circuit
8
6
IS
SLOPE
VCC
GND
VCC
GND
VCC
GND
4
7
7
7
OUT
OUT
OUT
5
SLOPE