UC3842AN 데이터 시트보기 (PDF) - STMicroelectronics

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UC3842AN

HIGH PERFORMANCE CURRENT MODE PWM CONTROLLER

STMicroelectronics 

UC384XA - UC284XA

Figure 27. 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

12/16

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