UC3842AN(1999) Просмотр технического описания (PDF) - STMicroelectronics

Номер в каталоге

Компоненты Описание

производитель

UC3842AN
(Rev.:1999)

HIGH PERFORMANCE CURRENT MODE PWM CONTROLLER

STMicroelectronics 

UC2842A/3A/4A/5A - UC3842A/3A/4A/5A

Figure 23: Soft-Start Circuit

8

4

2

1MΩ

1

C

R

BIAS

R

5Vref

+

-

OSC

+

+

-

EA

1mA

2R

R

S

Q

+

R

1V

-

5

D95IN354

Figure 24: Soft-Start and Error Amplifier Output Duty Cycle Clamp.

VCC Vin

7

8

R

BIAS

R

5Vref

+

-

4

OSC

+

2

R2

1

+

-

EA

1mA

VClamp

S

2R

-

Q

+

R

R

1V

Comp/Latch

5

C

R1 BC109

· VCLAMP =

R1

R1 + R2

where 0 <VCLAMP <1V

Ipk(max) =

VCLAMP

RS

7

6

Q1

5

RS

D95IN355

12/15

Share Link: