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UC3843BVD 데이터시트(PDF) 11 Page - ON Semiconductor

부품명 UC3843BVD
상세설명  HIGH PERFORMANCE CURRENT MODE CONTROLLERS
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제조업체  ONSEMI [ON Semiconductor]
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UC3843BVD 데이터시트(HTML) 11 Page - ON Semiconductor

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UC3842B, UC3843B, UC2842B, UC2843B, NCV3843BV
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Figure 20. 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
∆I
m1
∆I
Dl ) Dl m2
m1
Dl ) Dl m2
m1
m2
m1
Figure 21. External Clock Synchronization
Figure 22. External Duty Cycle Clamp and
Multi–Unit Synchronization
Figure 23. Adjustable Reduction of Clamp Level


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