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UC284XBN Fiches technique(PDF) 11 Page - Motorola, Inc

No de pièce UC284XBN
Description  HIGH PERFORMANCE CURRENT MODE CONTROLLERS
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Fabricant  MOTOROLA [Motorola, Inc]
Site Internet  http://www.freescale.com
Logo MOTOROLA - Motorola, Inc

UC284XBN Fiches technique(HTML) 11 Page - Motorola, Inc

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UC3844B, 45B UC2844B, 45B
11
MOTOROLA ANALOG IC DEVICE DATA
Figure 23. Current Waveform Spike Suppression
+
5.0V Ref
+
S
R
Q
7(11)
6(10)
5(8)
3(5)
RS
Q1
VCC
Vin
C
R
The addition of the RC filter will eliminate
instability caused by the leading edge spike
on the current waveform.
7(12)
Comp/Latch
T
Figure 24. MOSFET Parasitic Oscillations
Figure 25. Bipolar Transistor Drive
+
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.
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.
IB
+
0
7(12)
Rg
Comp/Latch
T
+


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