10

Power-Down Mode

During a rapid power-down condition, as would occur with a

power-supply short circuit with a poorly filtered power supply,

0.5

µF, a protection diode with a 1 ampere or higher rating

should be provided as shown in Figure 12.

An alternate protection method is shown in Figure 13, where

a51

Note that a small pulse width decrease will occur however,

nally desired pulse width.

FIGURE 12. RAPID POWER-DOWN PROTECTION CIRCUIT

IN5395

OR

EQUIVALENT

≥0.5µF

1(15)

2(14)

16

8

+

FIGURE 13. ALTERNATE RAPID POWER-DOWN PROTECTION

CIRCUIT

≥0.5µF

1(15)

2(14)

16

8

51

Ω

CD54HC4538, CD74HC4538, CD74HCT4538