UC3845BD1 Просмотр технического описания (PDF) - Motorola => Freescale

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Компоненты Описание

производитель

UC3845BD1

High Performance Current Mode Controllers

Motorola => Freescale 

UC3844B, 45B UC2844B, 45B

Figure 23. Current Waveform Spike Suppression

VCC

Vin

7(12)

5.0V Ref

+

–

+

–

T

S

Q

R

Comp/Latch

7(11)

Q1

6(10)

5(8)

3(5)

R

C

RS

The addition of the RC filter will eliminate

instability caused by the leading edge spike

on the current waveform.

Figure 24. MOSFET Parasitic Oscillations

VCC

Vin

7(12)

5.0V Ref

+

–

+

–

7(11)

Rg

Q1

T

S

Q

R

Comp/Latch

6(10)

5(8)

3(5)

RS

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.

Figure 25. Bipolar Transistor Drive

IB

+

Vin

0

Base Charge

–

Removal

C1

Q1

6(10)

5(8)

3(5)

RS

The totem pole output can furnish negative base current

for enhanced transistor turn–off, with the addition of

capacitor C1.

MOTOROLA ANALOG IC DEVICE DATA

11

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