EE3110 AECL7_Regulators_2007

EE3110 AECL7_Regulators_2007 - 7.4 Step-down Switching...

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7             Regulators     7.1        Series Regulators     Op-amp realization R 1 V Z R 2 V 0 R 3 Q 0 3 2 3 V R R R V v v Z in ip + = = Current limiter R 4 Q 1 Q 2 4 2 (max) R V I BE O =
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7.2        Shunt Regulators     Zener diode realization R S V 0 V I S I O R V c s I = ) / ( Op-amp realization R 1 V Z R 2 R S V 0 V I R 3 Q 0 3 2 3 V R R R V v v Z in ip + = = S I O R V c s I = ) / (
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7.3        Step-down      Switching Regulators     R 1 Variab le Pulse -width M od ulat or V Z R 2 V I V O R 3 Q L C 1 The variable pulse width modulator is used to adjust the  energy within a cycle 2 The LC network functions as a low pass filter to give a  DC output that is equal to the pulse width divided by  the period. 0 3 2 3 V R R R V v v Z in ip + = = 3 The diode protects the transistor from a large negative  voltage when the transistor turns OFF.
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Unformatted text preview: 7.4 Step-down Switching Regulators R 1 Variable Pulse-w idth M odulator V Z R 2 V I V O R 3 Q L C 1 Based on i-v relationship for an inductor L v i dt di L v = 2 When Q switches ON, a large change in current occurs which gives rise to a large voltage across L. 3 When Q switches OFF, this large voltage reverses and adds onto the input voltage and appears at the output. 4 The diode stops C discharging when the transistor is ON....
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EE3110 AECL7_Regulators_2007 - 7.4 Step-down Switching...

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