UC2842A View Datasheet(PDF) - STMicroelectronics

Part Name

Description

MFG CO.

UC2842A

HIGH PERFORMANCE CURRENT MODE PWM CONTROLLER

STMicroelectronics 

1 2 3 4 5 6 7 8 9 10 Next

UC384XA - UC284XA

Figure 18. Under Voltage Lockout.

7

ON/OFF COMMAND

Vi

TO REST OF IC

ICC

VON

VOFF

UC3842A UC3843A

UC3844A UC3845A

16V

8.4V

10V

7.6V

<17mA

<0.5mA

D95IN346mod

Figure 19. Current Sense Circuit.

ERROR

AMPL.

2R

IS

1

COMP

R

R

3

CURRENT

RS

C

SENSE

5

GND

D95IN347

Peak current (is) is determined by the formula

I

S

ma

x

≈

1----.-0----V---

RS

A small RC filter may be required to suppress switch transients.

Figure 20. Slope Compensation Techniques.

VOFF VON

VCC

1V

CURRENT

SENSE

COMPARATOR

IS

RSLOPE

R1

RS

VREG

8

RT

RT/CT 4

CT

ISENSE

3

5

GND

IS

RSLOPE

R1

RS

VREG

8

RT

RT/CT 4

CT

ISENSE

3

5

GND

D95IN348

8/16

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