Keywords: voltage regulation, op amps, pnp transistors, linear regulators
VOP1+ = VOP1-Using Superposition:
VOP1+ = 0V
VOP1-' = VP(R3/(R3+R1)Therefore:
VOP1-'' = (VN(R1/(R1+R3)
VOP1- = VOP1-' + VOP1-''
VOP1- = VP(R3/(R3+R1)) + VN(R1/(R1+R3))
VN = -VP(R3/(R3+R1))((R1+R3)/R1)
VN = -VP(R3/R1)Alternatively:
IR1 = VP/R1Therefore:
VN = -IR1 × R3 = (-VP/R1)R3The allowable range of the unregulated negative supply voltage is -6V to -24V. For a wider input-supply range, either replace Q1 with a higher gain transistor or lower the resistance of R4 and R5. VN can deliver up to 100mA without distortion, but VP is limited by the reference of IC1 to a maximum of 30mA, with a VP reduction at that level of ~0.3V. (For higher positive load currents you can substitute a different positive regulator.)
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APPLICATION NOTE 4405,AN4405, AN 4405, APP4405, Appnote4405, Appnote 4405
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