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SMP402 Datasheet 20-72 Vdc Input Non-isolated DC Output

Manufacturer: Power Integrations

Overview: SMP402 1-Watt Buck Regulator IC 20-72 VDC Input Non-isolated DC Output Product Highlights Integrated Power Switch and CMOS Controller • Output power > 1 W from 48 VDC input • Adjustable output voltage • Integrated solution minimizes overall size High-voltage, Low-capacitance MOSFET Output • Designed for ISDN T1 telemunications applications • Low capacitance allows for high frequency operation High-voltage Buck Regulator • Internal pre-regulator self-powers the IC on start-up • Designed for low power consumption • Minimum external parts required Built-In Self-protection Circuits • Undervoltage lockout • Thermal shutdown • Input polarity/level sense SMP402 + 48 VDC - ® + 5 VDC - PI-555A-123091 Figure 1. Typical Application.

General Description

The SMP402, intended for non-isolated ISDN telemunications power supply applications, bines a high voltage power MOSFET switch with a switchmode power system controller in a monolithic integrated circuit.

Few external ponents are required to implement a low cost power supply which meets stringent ISDN specifications.

High frequency operation reduces total power supply size.

Key Features

  • include high voltage, low RDS(ON), and low capacitance. Lower capacitance results in a reduction in gate drive power, and also facilitates higher frequency operation. The controller section of the SMP402 contains all the blocks required to drive and control the power stage: start-up preregulator circuit, oscillator, bandgap reference, error amplifier, gate driver and level shift. Protection features include undervoltage lockout, thermal shutdown, and input polarity and level sensing. The SMP402.

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