UC3842AN(1999) View Datasheet(PDF) - STMicroelectronics

Part Name

Description

Manufacturer

UC3842AN
(Rev.:1999)

HIGH PERFORMANCE CURRENT MODE PWM CONTROLLER

STMicroelectronics 

Figure 17 : Slope Compensation Techniques.

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

IS

RSLOPE

R1

RS

VREG

RT

RT/CT

CT

8

4 UC3842A

ISENSE

3

5

GND

IS

RSLOPE

R1

RS

VREG

RT

RT/CT

CT

8

4 UC3842A

ISENSE

3

5

GND

D95IN348

Figure 18 : Isolated MOSFET Drive and Current Transformer Sensing.

VCC

Vin

7

+

5.0Vref

-

+

-

S

Q

R

-

+

COMP/LATCH

6

3

C

D95IN349

ISOLATION

BOUNDARY

R

RS

VGS Waveforms

Q1

+

+

0

0

-

50% DC

-

25% DC

( ) Ipk =

V(pin 1) -1.4

3RS

NS

NP

NS

NP

9/15

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