LM2591HV datasheet(15/20 Pages) NSC

Part #	LM2591HV

Description	SIMPLE SWITCHER Power Converter 150 kHz 1A Step-Down Voltage Regulator

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Manufacturer	NSC [National Semiconductor (TI)]

Direct Link	http://www.national.com

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Application Information (Continued)

UNDERVOLTAGE LOCKOUT

Some applications require the regulator to remain off until

the input voltage reaches a predetermined voltage. An und-

ervoltage lockout feature applied to a buck regulator is

shown in Figure 8, while Figure 9 and Figure 10 applies the

same feature to an inverting circuit. The circuit in Figure 9

features a constant threshold voltage for turn on and turn off

(zener voltage plus approximately one volt). If hysteresis is

needed, the circuit in Figure 10 has a turn ON voltage which

is different than the turn OFF voltage. The amount of hyster-

esis is approximately equal to the value of the output volt-

age. If zener voltages greater than 25V are used, an addi-

tional 47 k

Ω resistor is needed from the ON /OFF pin to the

ground pin to stay within the 25V maximum limit of the ON

/OFF pin.

10129336

FIGURE 7. Delayed Startup

10129337

FIGURE 8. Undervoltage Lockout for Buck Regulator

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