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PDF FA5551 Data sheet ( Hoja de datos )

Número de pieza FA5551
Descripción Switching Power Supply Control IC
Fabricantes Fuji 
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No Preview Available ! FA5551 Hoja de datos, Descripción, Manual

(Under development)
FA5550 / 51
Fuji Switching Power Supply Control IC
FA5550 / 51
Application Note
(Under development)
Rev.0 Augu-2007
August 2007
Fuji Electric Device Technology Co.,Ltd.
Fuji Electric Device Technology
1

1 page




FA5551 pdf
4. Block diagram
(Under development)
FA5550 / 51
MUL
3
FB 1
COMP 2
GND 6
VREF(2.5V)
+
ERRAMP
-
MUL
VOS(2.0V)
+ AOC
VREF(2.5V)
VDD(5.0V)
VOVP(1.09VREF)
VZCD(1.5V/1.33V)
VOS(2.0V)
VBO
(1.237V/1.113V)
-
VSP(0.3V)
-
SP
+
OSC
VOVP(1.09VREF)
+
OVP SLOPE
-
REF
R
Q
S
45
IS SLOPE
5. Pin assignment
VCC OUT
GND SLOPE
8765
FA5550P/N
VCC
8
UVLO
SP
OVP
7 OUT
123
FB COMP MUL
IS
Pin No.
1
2
3
4
5
6
7
8
Symbol
FB
COMP
MUL
IS
SLOPE
GND
OUT
VCC
Function of pin
Voltage feed-back input
Error amplifier compensation pin
Multiplier input
Current sense input
SLOPE compensation pin
Ground
Output
Power supply
Functional description
Input pin from converter output voltage
Output pin for error amplifier
Input pin for sine-wave AC power supply waveform
Input pin for current detection of MOSFET
Pin for regulation of SLOPE compensation
Pin for power supply grounding
Output pin for direct drive of MOSFET
Pin for power supply input to operate IC
Rev.0 Augu-2007
Fuji Electric Device Technology
5

5 Page





FA5551 arduino
(Under development)
FA5550 / 51
(3) No. 3 pin (MUL pin)
Function:
(a) Input of input voltage waveform (sine-wave)
(b) Detection of brownout
How to use:
(a) Input of input voltage waveform (sine-wave).
How to connect:
Input rectified voltage of AC input with its voltage in
resistance-divided. In addition, connect C between MUL and
GND.
Operation
The rectified voltage input to MUL pin and ERRAMP output are
inputted into the multiplier (MUL), and a near-sinusoidal wave is
outputted from the multiplier. The output of the multiplier is set
as a reference of the comparator, and the comparator controls
the input voltage in the form of sine waves. In addition, because
the rectified voltage of AC input contains much noise
components due to the switching of Q1, a capacitor is normally
connected as a filter.
(b) Brownout
How to connect:
The same method as the control of the input current in the form
of the sine-wave
Operation
Brownout function stops the output pulses when AC input
voltage drops below programmed voltage. (See page 14)
(4) No.4 pin (IS pin)
Function:
(a) Detection of MOSFET current value
How to use:
(a) Detection of MOSFET current value
How to connect:
Connect a current detecting resistor Rs between the source pin
of MOSFET and GND, and input the current signal of MOSFET
generated with this resistor.
Operation
When output voltage of the multiplier and voltage of IS pin are
inputted into the comparator and IS pin voltage becomes larger
than the output of the multiplier, the comparator turns over its
output signal to turn OFF the OUT output.
The overcurrent limiting function limits the maximum threshold
voltage of IS pin within 1V.
Supplementary explanations
When MOSFET turns on, gate driving current of MOSFET and
surge current due to discharge from parasitic capacities in
thecircuit may run through the current detection resistor Rs. The
large surge current may result in malfunction and distortion of
the input current waveform. CR filters are usually connected as
the measure.
CUR.comp
3 MUL
MUL
ERRAMP
Fig.8 MUL pin circuit
IS 4
Fig.9 IS pin circuit
IS 4
Fig.10 Filters of IS pin
Rev.0 Augu-2007
Fuji Electric Device Technology
11

11 Page







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