UC384XBD MOTOROLA [Motorola, Inc], UC384XBD Datasheet - Page 11

• Manufacturer Part Number: UC384XBD
• Description: HIGH PERFORMANCE CURRENT MODE CONTROLLERS
• Manufacturer: MOTOROLA [Motorola, Inc]

MOTOROLA ANALOG IC DEVICE DATA
Figure 24. MOSFET Parasitic Oscillations
Series gate resistor R g will damp any high frequency
parasitic oscillations caused by the MOSFET input
capacitance and any series wiring inductance in the
gate–source circuit.
+
–
5.0V Ref
Comp/Latch
S
R
T
Q
+
–
–
+
7(12)
V CC
Figure 23. Current Waveform Spike Suppression
5.0V Ref
7(11)
6(10)
5(8)
3(5)
R g
UC3844B, 45B UC2844B, 45B
Comp/Latch
S
R
T
Q
V in
Q1
R S
+
–
7(12)
V CC
7(11)
6(10)
5(8)
3(5)
C
R
V in
Q1
R S
+
0
–
The totem pole output can furnish negative base current
for enhanced transistor turn–off, with the addition of
capacitor C 1 .
Figure 25. Bipolar Transistor Drive
I B
The addition of the RC filter will eliminate
instability caused by the leading edge spike
on the current waveform.
Base Charge
Removal
6(10)
5(8)
3(5)
C1
Q1
V in
R S
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