UC3842A 查看數據表（PDF） - STMicroelectronics

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UC3842A

HIGH PERFORMANCE CURRENT MODE PWM CONTROLLER

STMicroelectronics 

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

Figure 14 : Error Amp Configuration.

2.5V

+

Zi

VFB 2

-

COMP 1

Zf

1mA

D95IN345

Figure 15 : 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

VOFF VON

VCC

Fig.15-UC3842A

Figure 16 : 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

IS

max

≈

1.0 V

RS

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

8/15

1V

CURRENT

SENSE

COMPARATOR

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