Automotive Grade Transformer Driver for Isolated Power Supplies

The NSIP6055x-Q1 is an automotive grade push-pull transformer driver specially designed for small size, low-power isolation power supply with low standby power consumption. The periphery of the circuit only requires simple input and output filter capacitors, isolation transformer, and rectifier circuits. Its internal integrated oscillator provides a pair of highprecision complementary signals to drive two N-channel MOSFETs. The internal design of the chip follows a symmetrical structure, which can effectively ensure the high symmetry of the two power MOSFETs and avoid magnetic bias during the working process of the circuit. Ultra-low noise and EMI are achieved by slew rate control of the output switch voltage and through Spread Spectrum Clocking (SSC). The internal protection features include over current protection, under-voltage lockout, thermal shutdown and break-before-make circuitry. NSIP6055A has a 160 kHz internal oscillator for applications that need to minimize emissions. NSIP6055B has a 420 kHz internal oscillators for application that require higher efficiency and smaller transformer size. The NSIP6055x is available in a small SOT-23 (6) package, and is specified for operation at temperatures from –40°C to 125°C.