Thursday, March 28, 2013

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Under Voltage Lockout for Buck Circuit Using LM2575

This is a implementation for buck boost configuration. This circuit is control by LM2575. This is the figure of the circuit.


In some applications it is desirable to keep the regulator off until the input voltage reaches a certain threshold. These circuits keep the regulator off until the input voltage reaches a predetermined level.
VTH ≈ VZ1 + 2VBE (Q1)

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