5 volt DC power supply using LTC3833 regulator

A very simple step down DC converter electronic project , can be designed using the LTC3833 , manufactured by Linear Technology . The LTC3833 is a synchronous step-down DC DC switching regulator controller targeted for high power applications. It drives all N-channel power MOSFETs. The controlled on-time valley current mode architecture allows for both fast transient response and constant frequency switching in steady-state operation, independent of VIN, VOUT and load current.
As you can see in the schematic circuit , this step down DC converter design , require few external electronic components .
This step down DC converter require an input voltage between 7 volt and 38 volt and will provide a fixed 5 volt DC at a maximum output current of 8 amperes .
As you can see in the diagram bellow , the efficiency of this step-down Dc converter is very high . You can use this 5 volts DC converter circuit for applications like datacomm systems , computing systems or some other electronic projects where is needed a high precision low output voltage at a huge output current .

Some features of the LTC3833 switching regulator are : wide VIN Range: 4.5V to 38V , VOUT Range: 0.6V to 5.5V ,differential output sensing allowing up to 500mV line loss , fast load transient response ,frequency programmable from 200kHz to 2MHz , overvoltage protection and current limit foldback , power good output voltage monitor and more .

Regulated DC power supply

Regulated DC Power Supply using transistors.

A low ripple regulated DC power supply designed based on transistors is shown here. Such transistor voltage regulators are suitable for application where high output current is required. Conventional integrated series regulators like 7805 can only deliver up to 1A. Additional series pass transistors have to be added to the 7805 based regulator circuit for improving their current capacity.

Description.

The circuit shown below is a basic series voltage regulator based on transistors. Transistor Q1 (2N 3054) and Q2 (2N 3055) form a darlington pair. Resistor R1 provides the base current for Q1 and also keeps the zener diode D2 in the active region. The overall working of the circuit can be demonstrated by explaining two situations.

• When the input voltage (output of the rectifier section) increases, the output voltage of the regulator (Vout) also increases. This increase in Vout decreases the base emitter voltage of Q2 because the zener diode D2 is operating in the breakdown region and the voltage across it is unchangeable. This decrease in V_BEincreases the collector emitter resistance? of Q2 and so the output voltage (Vout) gets reduced accordingly.
• When the output load increases, the output voltage (Vout) gets reduced. This decrease of output voltage (Vout) makes V_BEof Q2 to decrease. This reduces the collector emitter resistance of Q2 and so the output voltage gets increased accordingly.

Circuit diagram.

Regulated dc power supply

Notes.

• If 5A bridge is not available, then make one using 6A6 diodes.
• Transistor Q2 requires a heat sink.
• An optional 5A fuse can be added in series to the output.
• Breakdown voltage of the zener diode D2 must be chosen according to the output voltage you need, and it is according to the equation, Vout = Vz – 0.7.

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