NCV3843BV ON Semiconductor, NCV3843BV Datasheet - Page 16

• Manufacturer Part Number: NCV3843BV
• Description: High Performance Current Mode Controllers
• Manufacturer: ON Semiconductor

4.7k
18k
All outputs are at nominal load currents, unless otherwise noted
Line Regulation: 5.0 V
Load Regulation: 5.0 V
Output Ripple:
Efficiency
100
pF
0.01
4700pF
Test
150k
10k
8(14)
4(7)
2(3)
1(1)
115 Vac
±12 V
±12 V
5.0 V
±12 V
4.7
W
UC3842B, UC3843B, UC2842B, UC2843B, NCV3843BV
EA
Figure 34. 27 W Off−Line Flyback Regulator
V
V
V
V
V
R
R
in
in
in
in
in
I
I
+
out
out
= 95 to 130 Vac
= 115 Vac,
= 115 Vac,
= 115 Vac
= 115 Vac
Osc
Bias
= 1.0 A to 4.0 A
= 100 mA to 300 mA
MDA
Conditions
202
−
+
5(9)
5.0V Ref
+
Comp/Latch
D = 50 mV or ± 0.5%
D = 24 mV or ± 0.1%
D = 300 mV or ± 3.0%
D = 60 mV or ± 0.25%
250
R
S
http://onsemi.com
Q
40 mV
80 mV
Results
70%
+
−
16
7(12)
56k
pp
pp
7(11)
6(10)
5(8)
3(5)
100
1N5819
4.7k
+
1N4935
1N4937
68
22
470pF
1.0k
1N4935
3300
pF
47
MTP
4N50
+
0.5
T1
680pF
L2, L3
T1 −
2.7k
L1
MBR1635
Primary: 45 Turns #26 AWG
Secondary ±12 V: 9 Turns #30 AWG
(2 Strands) Bifiliar Wound
Secondary 5.0 V: 4 Turns (six strands)
#26 Hexfiliar Wound
Secondary Feedback: 10 Turns
#30 AWG (2 strands) Bifiliar Wound
Core: Ferroxcube EC35−3C8
Bobbin: Ferroxcube EC35PCB1
Gap: ≈ 0.10" for a primary inductance
of 1.0 mH
MUR110
MUR110
− 15 mH at 5.0 A, Coilcraft Z7156
− 25 mH at 5.0 A, Coilcraft Z7157
2200
1000
1000
+
+
+
1N4937
1000
L2
L1
L3
10
10
+
+
+
5.0V/4.0A
5.0V RTN
12V/0.3A
±
−12V/0.3A
12V RTN