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LB1948MC-BH Datasheet(PDF) 7 Page - ON Semiconductor |
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LB1948MC-BH Datasheet(HTML) 7 Page - ON Semiconductor |
7 / 8 page LB1948MC www.onsemi.com 7 Thermal Shutdown Circuit Block Diagram Vref Reference voltage circuit Thermal shutdown circuit Drive circuit Function equivalent circuit Note: The above is an example of thermal shutdown circuits although there are some differences from the actual internal circuit. Thermal Shutdown Operation The thermal shutdown circuit compares the voltage of the heat sensitive element (diode) with the reference voltage and shuts off the drive circuit at a certain temperature to protect the IC chip from overheating. ICC -- VCC IIN -- VIN VO(sat) -- IO ICC -- Ta 40 0 10 20 30 0 5 10 15 20 0 5 10 15 20 400 0 100 200 300 0.6 0 0.1 0.3 0.5 0.2 0.4 0 100 200 300 400 500 600 40 0 10 20 30 -40 -20 0 20 40 60 80 100 120 140 VIN=5V (= IN1 / IN2 or IN3 / IN4) H / H H / L, L /H L / L VCC=12V IN1~4 VCC=12V VCC=12V (IN1 / 2) H /H H / L, L /H Supply voltage, VCC -- V Input voltage, VIN -- V Output current, IO -- mA Ambient temperature, Ta -- °C High side and Low side |
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