EMT 212 ANALOG ELECTRONICS Professor Robert T Kennedy.

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Presentation transcript:

EMT 212 ANALOG ELECTRONICS Professor Robert T Kennedy

Prof. R T Kennedy

PROTECTION FEATURES SHORT CIRCUIT CURRENT SHORT CIRCUIT CURRENT OVERVOLTAGE OVERVOLTAGE THERMAL SHUTDOWN THERMAL SHUTDOWN REVERSE BATTERY REVERSE BATTERY REVERSE TRANSIENT REVERSE TRANSIENT Prof. R T Kennedy EFFECTS DESIGN PERFORMANCE COST SYSTEM RELIABILTY

SHORT CIRCUIT PROTECTION CONSTANT CURRENT LIMIT CIRCUIT CONSTANT CURRENT LIMIT CIRCUIT FOLDBACK CURRENT LIMIT FOLDBACK CURRENT LIMIT Prof. R T Kennedy

CONSTANT CURRENT LIMIT Prof. R T Kennedy ON CHIP I out I Bpass I CQ2 I EQ2 V BEQ3 Q3 on IBIB

FOLDBACK CURRENT LIMIT Prof. R T Kennedy

CURRENT LIMITING CHARACTERISTICS constant current foldback Prof. R T Kennedy

POWER DISSIPATION Prof. R T Kennedy V IN ‘CONSTANT CURRENT’ LINEAR REGULATOR V OUT ‘FOLDBACK’ CURRENT LINEAR REGULATOR V IN V OUT

THERMAL SHUTDOWN Prof. R T Kennedy ON CHIP  V BEQ1 -2mV/ o C V BEQ2 I CQ2 shutdown

OVERVOLTAGE PROTECTION Prof. R T Kennedy ON CHIP ZENER several 7V devices in series

OVERVOLTAGE PROTECTION Prof. R T Kennedy PASS ELEMENT Q1 OFF ZENER OFF V in ZENER ON Q1 Q2 sat Q3 Q4 OFF

DIODE PROTECTION CIRCUITS Prof. R T Kennedy if V IN falls faster than Vout (typical of C loads) or Vin s/c C 1 DISCHARGES via D 1 C 2 DISCHARGES via D1,  D2 BYPASSES ic

REVERSE INPUT VOLTAGE DIODE PROTECTION Prof. R T Kennedy

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