AIC3843

5

Error AMP Configuration

1

2

+

-

V

FB

COMP

0.5mA

2.50V

Error Amp can Source or Sink up to 0.5mA

Fig. 1

Under-Voltage Lockout

7

AIC3843

8.4V

7.6V

17mA

500

µA

V

OFF

V

ON

I

CC

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.

Fig. 2-1

Fig. 2-2

Current Sense Circuit

R

C

2R

R

1V

GND

Current Sense

COMP

Error AMP

Current Sense

Comparator

Peak Current (Is) is Determined By The Formula

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

Fig. 3