How do I configure the LM2576HV for shutdown control of a -12V output inverting regulator?
Referring to the LM2596(HV) datasheet, Figure 27 shows the shutdown configuration for a -5V inverting regulator. The shutdown transistor pulls the ON/OFF pin below 1.3V (with respect to the ground pin) to turn the regulator ON. Conversely, when the shutdown control transistor turns ON, the voltage drop across R4 is approx. 3.7V (assumung logic “1” input is +5V), giving 1.3V at the ON/OFF pin, thus shutting the regulator OFF. For the -12V output, the value of R1 should be changed to 21.1k to maintain the 3.7V drop across R4. The value of R4 should remain unchanged (6.2k).
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