PRODUCT SPECIFICATION

ML4818

REV. 1.0.3 6/21/01

9

early in the power cycle the over-current occurs, a reset will

occur more quickly under output short circuit conditions

(Figures 11a and 11b) than during a load surge (Figures 11c

and 11d).

When the soft start reset occurs, the output is inhibited and

the soft start capacitor is discharged. The output will remain

reset delay. When the IC restarts, the error amplifier output

voltage is limited to the voltage at SOFT START, thus limit-

ing the duty cycle.

Under-Voltage Lockout

Figure 12).

Waveforms During Short Circuit

Waveforms During Load Surge

Figure 12. Under-Voltage Lockout and Reference Circuits

Figure 13. Supply Current vs. Temperature (°C)

1V

3.4V

V(PIN 4)

V(PIN 12)

1V

3.4V

V(PIN 4)

V(PIN 12)

INHIBIT

OUTPUTS

–

+

+

–

20

24

INTERNAL

BIAS

4V

TO LOGIC

CIRCUITS

5V

9V

POWER

DOWN

70

68

66

64

62

60

58

56

54

52

50

–75

–25

25

75

125

175

TEMPERATURE