FA7611CP Datasheet, PDF (6/6 Pages) Fuji Electric – Bipolar IC For Switching Power Supply Control

s Application circuit
Flyback-transformer type and chopper type buck converter circuit
FA7611CP(E)
VCC
3.3k
63.5k
TR
+
– C1
D10
1k
D11
100k 22k
22000p
0.01µ
Rout1
Q1
D12
VCC
1M
16 15 14 13 12 11 10 9
+
–
C2
REF DT1 IN1(+) IN1(–) FB1 OUT1 OUT1R VCC
FA7611CP(E)
CT CS DT2 IN2(+)IN2(–) FB2 GND OUT2
1 2 34 5 6 7 8
1M
Q2
56k
4.7µ
0.01µ
R21
R20
1000p
330k
820k
1k
2.2k
20.07k
Chopper type buck converter and inverting converter circuit
+
– ^C11
+
– ^C12
–
+ ^C13
L2
D20 ^C20
+
–
Flyback
24V
10V
–10V
Buck
5V
3.3k
30.1k
22000p
0.01µ
VCC
16
15
14
13
12
REF DT1 IN1(+) IN1(–) FB1
1k
11
10
9
OUT1 OUT1R VCC
Rout1
FA7611CP(E)
CT
CS
DT2 IN2(+) IN2(–) FB2 GND OUT2
1
2
3
4
5
6
7
8
R20
56k
1000p
+–4.7_µ
47000p
820k
1k
100k 22k
2.2k
5.02k
Q1
R11
+
–
C1
L1
D10
+
–
C10
VCC
R21
Q2
+
–
C2
D20
L2
–
+ ^C20
Buck
5V
Inverting
–5V
Parts tolerances characteristics are not defined in the circuit design
sample shown above.
When designing an actual circuit for a product, you must determine
parts tolerances and characteristics for safe and economical
operation.
Please connect a capacitor, which the value is about 0.01µF to 0.1µF,
between VCC and REF terminals in order to prevent from irregular
output pulse at start-up.
6