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UC3842BDG Datasheet(PDF) 12 Page - ON Semiconductor

Part No. UC3842BDG
Description  High Performance Current Mode Controllers
Download  22 Pages
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Maker  ONSEMI [ON Semiconductor]
Homepage  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

UC3842BDG Datasheet(HTML) 12 Page - ON Semiconductor

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UC3842B, UC3843B, UC2842B, UC2843B
http://onsemi.com
12
Figure 21. Continuous Current Waveforms
2(3)
EA
Bias
+
Osc
R
R
R
2R
5(9)
1(1)
4(7)
8(14)
RT
CT
Vref
0.01
The diode clamp is required if the Sync amplitude is large enough to cause the bottom
side of CT to go more than 300 mV below ground.
External
Sync
Input
47
+
R
R
R
2R
Bias
Osc
EA
5(9)
1(1)
2(3)
4(7)
8(14)
To Additional
UCX84XBs
R
S
Q
8
4
6
5
2
1
C
3
7
RA
RB
5.0k
5.0k
5.0k
MC1455
f
+
1.44
(RA ) 2RB)C
D(max) +
RB
RA ) 2RB
+
-
5.0V Ref
+
-
S
R
Q
Bias
+
Osc
R
R
R
2R
EA
1.0V
5(9)
7(11)
6(10)
5(8)
3(5)
RS
Q1
VCC
Vin
1(1)
2(3)
4(7)
8(14)
R1
VClamp
R2
7(12)
Comp/Latch
1.0 mA
Ipk(max) [
VClamp
RS
Where: 0
≤ VClamp ≤ 1.0 V
VClamp
1.67
R2
R1
) 1
+ 0.33x10-3
R1R2
R1 ) R2
Control Voltage
Inductor
Current
Oscillator Period
Control Voltage
Inductor
Current
Oscillator Period
(A)
(B)
m1
m2
t0
t1
t2
t3
m3
m2
t4
t5
t6
DI
m1
DI
Dl ) Dl m2
m1
Dl ) Dl m2
m1
m2
m1
Figure 22. External Clock Synchronization
Figure 23. External Duty Cycle Clamp and
Multi−Unit Synchronization
Figure 24. Adjustable Reduction of Clamp Level


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