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UC3842BDG Datasheet(PDF) 14 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) 14 Page - ON Semiconductor

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UC3842B, UC3843B, UC2842B, UC2843B
http://onsemi.com
14
Figure 29. MOSFET Parasitic Oscillations
6(10)
5(8)
3(5)
RS
Q1
Vin
C1
Base Charge
Removal
The totem pole output can furnish negative base current for enhanced
transistor turn-off, with the addition of capacitor C1.
S
R
5.0V Ref
Q
7(11)
6(10)
5(8)
3(5)
RS
Q1
VCC
IB
+
-
0
Vin
Isolation
Boundary
VGS Waveforms
+
-
0
+
-
0
50% DC
25% DC
Ipk +
V(Pin1) * 1.4
3RS
NS
Np
Comp/Latch
7(12)
R
C
NS
NP
+
-
+
-
Bias
+
Osc
R
R
R
2R
EA
5(9)
1(1)
2(3)
4(7)
8(14)
The MCR101 SCR must be selected for a holding of < 0.5 mA @ TA(min). The simple two
transistor circuit can be used in place of the SCR as shown. All resistors are 10 k.
MCR
101
2N
3905
2N
3903
1.0 mA
S
R
5.0V Ref
Q
7(11)
6(10)
5(8)
3(5)
RS
Q1
VCC
Vin
Series gate resistor Rg will damp any high frequency parasitic oscillations
caused by the MOSFET input capacitance and any series wiring inductance in
the gate-source circuit.
7(12)
Rg
Comp/Latch
+
-
+
-
Figure 30. Bipolar Transistor Drive
Figure 31. Isolated MOSFET Drive
Figure 32. Latched Shutdown


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