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UC2842BN 데이터시트(PDF) 11 Page - Motorola, Inc

부품명 UC2842BN
상세설명  HIGH PERFORMANCE CURRENT MODE CONTROLLERS
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제조업체  MOTOROLA [Motorola, Inc]
홈페이지  http://www.freescale.com
Logo MOTOROLA - Motorola, Inc

UC2842BN 데이터시트(HTML) 11 Page - Motorola, Inc

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UC3842B, 43B UC2842B, 43B
11
MOTOROLA ANALOG IC DEVICE DATA
Figure 20. External Clock Synchronization
Figure 21. External Duty Cycle Clamp and
Multi–Unit Synchronization
Figure 22. Adjustable Reduction of Clamp Level
Figure 23. Soft–Start Circuit
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
5.0V Ref
+
S
R
Q
Bias
+
1.0mA
Osc
R
R
R
2R
EA
1.0V
5(9)
1(1)
2(3)
4(7)
8(14)
C
1.0M
tSoft–Start ≈ 3600C in µF
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


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