LP2951 + 6V 120kΩ 1.5 kΩ** 1N457 SEALED LEADACID BATTERY FB LM385 SOURCE – ≈ 400 kΩ* FOR 5.5V 3 100 kΩ 8 +V IN VOUT 1 MAIN V+ LP2951 SENSE SD 2 MEMORY V+ + 1 μF GND 4 20Ω + * Sets disconnect voltage ** Sets disconnect hysteresis NI-CAD BACKUP BATTERY For values shown, Regulator shuts down when VIN < 5.5V and turns on again at 6.0V. Current drain in disconnected mode is 150 μA. LOW BATTERY DISCONNECT +VIN 8 +VIN AUX. SHUTDOWN INPUT 3 10 kΩ ERROR SD 5 5° PRE-SHUTDOWN FLAG LP2951 OFF VOUT ON GND 4 + TEMP. LM34 OR SENSOR LM35 – 1 FB 7 EXTERNAL CIRCUIT PROTECTED FROM OVER TEMPERATURE (V+ GOES OFF WHEN TEMP.> 125°) OR RELAY 8.2 kΩ LM34 for 125°F Shutdown LM35 for 125°C Shutdown SYSTEM OVER TEMPERATURE PROTECTION CIRCUIT DS20005736A-page 4 2017 Microchip Technology Inc.
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