UC2844BN(2008) データシートの表示（PDF） - ON Semiconductor

部品番号

コンポーネント説明

メーカー

UC2844BN
(Rev.:2008)

High Performance Current Mode Controllers

ON Semiconductor 

UC3844B, UC3845B, UC2844B, UC2845B

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. Current Waveform Spike Suppression

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. MOSFET Parasitic Oscillations

IB

+

0

-

Vin

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.

Figure 26. Bipolar Transistor Drive

http://onsemi.com

11

Share Link: