Tuesday, April 2, 2013
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5V to 12V Boost Converter Using LT1370
5V to 12V Boost Converter Using LT1370
This is a design for booster converter. This booster can convert the voltage from 5 V to 12 V. This circuit is using LT1370 IC as main control. The high 6A switch rating permits the circuit to deliver up to 24W. This is the figure of the circuit.
The inductor needs to be chosen carefully to meet peak current values. The output capacitor can see high ripple currents often, as in this application, higher than the ripple rating of a single capacitor. This requires the use of two surfaces mount tantalums in parallel; both capacitors should be of the same value and manufacturer. The input capacitor does not have to endure such high ripple currents and a single capacitor will normally suffice. The catch diode, D1, must be rated for the output voltage and average output current. The compensation capacitor, C2, normally forms a pole in the 2Hz to 20Hz range, with a series resistor, R3, to add a zero at 1kHz to 5kHz. The S/S pin in this example is driven by a logical on/off signal, a low input forcing the LT1370 into its 12mA shutdown mode.
The inductor needs to be chosen carefully to meet peak current values. The output capacitor can see high ripple currents often, as in this application, higher than the ripple rating of a single capacitor. This requires the use of two surfaces mount tantalums in parallel; both capacitors should be of the same value and manufacturer. The input capacitor does not have to endure such high ripple currents and a single capacitor will normally suffice. The catch diode, D1, must be rated for the output voltage and average output current. The compensation capacitor, C2, normally forms a pole in the 2Hz to 20Hz range, with a series resistor, R3, to add a zero at 1kHz to 5kHz. The S/S pin in this example is driven by a logical on/off signal, a low input forcing the LT1370 into its 12mA shutdown mode.