Datasheet SM72485E/NOPB - National Semiconductor

Detailed Description

Manufacturer: National Semiconductor

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Docket:
SM72485 SolarMagic 100V, 150 mA Constant On-Time Buck Switching Regulator
May 10, 2011
SM72485 SolarMagic 100V, 150 mA Constant On-Time Buck Switching Regulator
General Description
The SM72485 Step Down Switching Regulator features all of the functions needed to implement a low cost, efficient, Buck bias regulator.

This high voltage regulator contains an 100 V N-Channel Buck Switch. The device is easy to implement and is provided in the MSOP-8 and the thermally enhanced LLP-8 package. The regulator is based on a control scheme using an ON time inversely proportional to VIN. This feature allows the operating frequency to remain relatively constant. The control scheme requires no loop compensation. An intelligent current limit is implemented with forced OFF time, which is inversely proportional to Vout. This scheme ensures short circuit control while providing minimum foldback. Other features include: Thermal Shutdown, VCC under-voltage lockout, Gate drive under-voltage lockout, Max Du

Specifications:

• Number of Outputs: 1
• Number of Pins: 8
• Operating Temperature Range: -40°C to +125°C
• Output Current: 9.2 mA
• Primary Input Voltage: 95 V