lm2596sx-12 National Semiconductor Corporation, lm2596sx-12 Datasheet - Page 27

• Manufacturer Part Number: lm2596sx-12
• Description: Simple Switcher Power Converter 150 Khz 3a Step-down Voltage Regulator
• Manufacturer: National Semiconductor Corporation

Application Information
INVERTING REGULATOR SHUTDOWN METHODS
To use the ON /OFF pin in a standard buck configuration is
simple, pull it below 1.3V (
turn regulator ON, pull it above 1.3V to shut the regulator
FIGURE 28. Inverting Regulator Ground Referenced Shutdown using Opto Device
@
25˚C, referenced to ground) to
FIGURE 27. Inverting Regulator Ground Referenced Shutdown
(Continued)
27
OFF. With the inverting configuration, some level shifting is
required, because the ground pin of the regulator is no
longer at ground, but is now setting at the negative output
voltage level. Two different shutdown methods for inverting
regulators are shown in Figure 27 and 28.
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