NCV3843BV ON Semiconductor, NCV3843BV Datasheet - Page 12

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

DI
Inductor
Current
Control Voltage
f +
Control Voltage
C
R
R
6
5
2
A
B
(R A ) 2R B )C
8
Figure 20. Continuous Current Waveforms
1.44
Figure 22. External Duty Cycle Clamp and
1
5.0k
5.0k
5.0k
t
t
4
0
m
MC1455
Multi−Unit Synchronization
1
R
S
Oscillator Period
Dl ) Dl m 2
D (max) +
Q
4
DI
m
UC3842B, UC3843B, UC2842B, UC2843B, NCV3843BV
Oscillator Period
1
m 1
R A ) 2R B
m
t
3
7
2
1
R B
m
3
(B)
(A)
8(14)
4(7)
2(3)
1(1)
t
Dl ) Dl m 2
2
t
m
5
To Additional
UCX84XBs
2
m 1
EA
R
R
m 2
m 1
+
Osc
Bias
http://onsemi.com
2R
Inductor
Current
R
t
3
t
6
5(9)
12
R
R
2
1
V
8(14)
Clamp
4(7)
2(3)
1(1)
Figure 23. Adjustable Reduction of Clamp Level
External
≈
The diode clamp is required if the Sync amplitude is large enough to cause the bottom
side of C
Sync
Input
R 2
R 1
Figure 21. External Clock Synchronization
R
R
EA
T
1.67
) 1
to go more than 300 mV below ground.
+
Osc
Bias
1.0 mA
0.01
+ 0.33x10
2R
R
C
−
+
−3
R
47
T
V
5(9)
T
Clamp
1.0V
R 1 ) R 2
R 1 R 2
5.0V Ref
8(14)
V
4(7)
2(3)
1(1)
ref
Comp/Latch
R
S
Where: 0 ≤ V
I pk(max) [
Q
EA
R
R
Clamp
+
V Clamp
Osc
7(12)
R S
+
−
Bias
≤ 1.0 V
V
CC
7(11)
6(10)
5(8)
3(5)
2R
R
5(9)
Q1
R
V
in
S