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AX3842 Datasheet(PDF) 8 Page - List of Unclassifed Manufacturers

Part # AX3842
Description  High Performance Current Mode Pwm Controlers
PDF  12 Pages
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Manufacturer  ETC [List of Unclassifed Manufacturers]
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AX3842 Datasheet(HTML) 8 Page - List of Unclassifed Manufacturers

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AVANTICS - AX3842 Series
Specification No.: 050308-FE0008
Current Sense Circuit
Slope Compensation Techniques
Isolated MOSFET Drive and Current Transformer Sensing
Peak current (Is) is determined by the formula
Is(max.)
≈ 1V/Rs
A small RC filter may be required to suppress switch transients.
R
Rs
C
2R
COMP
Is
Current
Sense
GND
1
3
5
Error Ampl.
R1V
Current
Sense
Comparator
5.0Vref
+
+
+
-
-
Vcc
S
R
Q
COMP/Latch
C
R
Rs
Ns
Np
Q1
Vin
Isolation
Boundary
3
6
7
VGS Waveforms
50%DC
25%DC
Ipk=((Vpin1-1.4)/3Rs)(Ns/Np)
+
0
-
+
0
-
R1
8
Rs
5
R
4
RT
3
CT
SLOPE
AX3842
Is
VREG
RT/CT
ISENSE
GND
R1
8
Rs
5
R
4
RT
3
CT
SLOPE
AX3842
Is
VREG
RT/CT
ISENSE
GND



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