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UC284XBN データシート(PDF) 11 Page - ON Semiconductor

部品番号 UC284XBN
部品情報  HIGH PERFORMANCE CURRENT MODE CONTROLLERS
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メーカー  ONSEMI [ON Semiconductor]
ホームページ  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

UC284XBN データシート(HTML) 11 Page - ON Semiconductor

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UC3842B, UC3843B, UC2842B, UC2843B, NCV3843BV
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11
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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