FA5502PM Fuji Electric holdings CO.,Ltd, FA5502PM Datasheet - Page 22

• Manufacturer Part Number: FA5502PM
• Description: Power Factor Correction
• Manufacturer: Fuji Electric holdings CO.,Ltd

(11-5) VCC pin
(12) Voltage rating of IDET pin
FA5502P/M
GND wiring so as not to generate a common
impedance with other wires.
To suppress this noise, connect a capacitor near VCC
pin even if IC is energized by another power supply.
Determine the capacitance so that the noise generated
at VCC pin will be within about
sure no malfunction occurs by noise.
inductor current, is -10V. In case of a general boost
circuit, a inrush current for charging the output
smoothing capacitor Co flows at the instant when an
AC input voltage is connected. This current may be by
far greater than the input current at a normal operation.
As a result, a voltage much higher than normal may be
applied to IDET pin. Pay attention so that a voltage
beyond the maximum voltage rating of -10V will not be
applied to IDET pin even at an instant when an AC
input voltage has been connected. If there are cases
where a voltage higher than rating is applied to IDET
pin, insert a limiting circuit for inrush current, or add a
Zener diode as shown in Fig.26 or 27 to suppress the
voltage applied to IDET pin.
A noise applied to VCC pin may cause a malfunction.
The voltage rating of IDET pin, which monitors an
Fig.26 IDET pin protection (1)
Fig.27 IDET pin protection (2)
Rn
Rn
L
ZD
Rs
L
Rs
ZD
Cn
Cn
Q
Q
16
16
7
7
0.6V . Then, make
GND
GND
IDET
IDET
D
D
FA5502
FA5502
Co
Co
(13) Prevention of malfunction by negative
22
voltage. In the case of other pins, however, if large
negative voltage is applied, parasitic elements in IC
may operate and it may cause a malfunction. Pay
attention so that the voltage applied to pins other than
IDET pin will not be lower than -0.3V.
IDET pin is so designed as to input a negative
voltage of each pin
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