UC3842TN Просмотр технического описания (PDF) - STMicroelectronics

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UC3842TN

HIGH PERFORMANCE CURRENT MODE PWM CONTROLLER

STMicroelectronics 

UC3842T - UC3843T - UC3844T - UC3845T

Figure 15 : Error Amp Configuration.

2.5V

+

Zi

VFB 2

-

COMP 1

Zf

1mA

D95IN345

Figure 16 : Under Voltage Lockout.

7

Vi

ON/OFF COMMAND

TO REST OF IC

VON

VOFF

UC3842T

UC3844T

16V

UC3843T

UC3845T

8.4V

10V

7.6V

ICC

<17mA

<0.5mA

D99IN1058

VOFF VON

VCC

During UVLO, the Output is low

Figure 17 : Current Sense Circuit .

ERROR

AMPL.

2R

IS

1

COMP

R

3

R

1V

CURRENT

SENSE

COMPARATOR

CURRENT

RS

C

SENSE

5

GND

D95IN347

Peak current (is) is determined by the formula

IS

max

≈

1.0 V

RS

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

8/15

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