AIC3843CNTR 查看數據表（PDF） - Analog Intergrations

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AIC3843CNTR

Current-Mode PWM Controller

Analog Intergrations 

Error AMP Configuration

ZI

Under-Voltage Lockout

7

2.50V

0.5mA

+

VFB

-

2

COMP

ZF 1

Error Amp can Source or Sink up to 0.5mA

Fig. 1

ICC

AIC3843

AIC3843

17mA

V ON

8.4V

500µA

V OFF

7.6V

V CC

Fig. 2-1

Fig. 2-2

VOFF VON

During under-voltage lockout, the output driver is biased to sink minor amounts of

current. Pin 6 should be shunted to ground with a bleeder resistor to prevent

activating the power switch with extraneous leakage currents.

Current Sense Circuit

Error AMP

IS

R

RS

COMP

C

Current Sense

GND

2R

R

1V

Current Sense

Comparator

Peak Current (Is) is Determined By The Formula

ISMAX≈ 1.0V

RS

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

Fig. 3

5

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