National Manuals

National LM2599 Manual(1)(1)

LM2599 SIMPLE SWITCHER® Power Converter 150 kHz 3A Step-Down Voltage Regulator, with Features

The LM2599 series of regulators are monolithic integrated circuits that provide all the active functions for a step-down (buck) switching regulator, capable of driving a 3A load with excellent line and load regulation. These devices are available in fixed output voltages of 3.3V, 5V, 12V, and an adjustable output version. This series of switching regulators is similar to the LM2596 series, with additional supervisory and performance features added. Requiring a minimum number of external components, these regulators are simple to use and include internal frequency compensation, improved line and load specifications, fixed-frequency oscillator, Shutdown/Soft-start, error flag delay and error flag output. The LM2599 series operates at a switching frequency of 150 kHz thus allowing smaller sized filter components than what would be needed with lower frequency switching regulators. Available in a standard 7-lead TO-220 package with several different lead bend options, and a 7-lead TO-263 Surface mount package. A standard series of inductors (both through hole and surface mount types) are available from several different manufacturers optimized for use with the LM2599 series. This feature greatly simplifies the design of switch-mode power supplies. Other features include a guaranteed ±4% tolerance on output voltage under all co

National LM2599 Manual(1)

The LM2599 is a high performance, high reliability switch-mode power supply with a 150kHz switching frequency and a 3A output current.

National LM2598 Guide

The LM2598 is a 150kHz 1A step-down switching regulator that provides fixed 3.3V, 5V, 12V, and an adjustable output voltage. This chip features excellent line and load regulation and only requires the minimum number of external components for use.

National LM2598 Manual

The LM2598 series is a monolithic integrated circuit that provides all the active functions for a step-down (buck) switching regulator, capable of driving a 1A load with excellent line and load regulation. These devices are available in fixed output voltages of 3.3V, 5V, 12V, and an adjustable output version. This series of switching regulators is similar to the LM2595 series, with additional supervisory and performance features added. Requiring a minimum number of external components, these regulators are simple to use and include internal frequency compensation, improved line and load specifications, fixed-frequency oscillator, Shutdown /Soft-start, error flag delay and error flag output. The LM2598 series operates at a switching frequency of 150 kHz thus allowing smaller sized filter components than what would be needed with lower frequency switching regulators. Available in a standard 7-lead TO-220 package with several different lead bend options, and a 7-lead TO-263 surface mount package. Typically, for output voltages less than 12V, and ambient temperatures less than 50˚C, no heat sink is required. A standard series of inductors (both through hole and surface mount types) are available from several different manufacturers optimized for use with the LM2598 series. This feature greatly simplifies the design.

National LM2596 Manual(1)(1)

The LM2596 is a simple switch-mode power converter that operates at a frequency of 150 kHz and provides 3A of output power. The device has good line and load regulation and requires a minimum number of external components.

National LM2596 Manual(1)

The LM2596 series is a monolithic integrated circuit that provides all the active functions for a step-down (buck) switching regulator, capable of driving a 3A load with excellent line and load regulation. These devices are available in fixed output voltages of 3.3V, 5V, 12V, and an adjustable output version. Requiring a minimum number of external components, these regulators are simple to use and include internal frequency compensation, and a fixed-frequency oscillator. The LM2596 series operates at a switching frequency of 150 kHz thus allowing smaller sized filter components than what would be needed with lower frequency switching regulators. Available in a standard 5-lead TO-220 package with several different lead bend options, and a 5-lead TO-263 surface mount package. A standard series of inductors are available from several different manufacturers optimized for use with the LM2596 series. This feature greatly simplifies the design of switch-mode power supplies. Other features include a guaranteed ±4% tolerance on output voltage under specified input voltage and output load conditions, and ±15% on the oscillator frequency. External shutdown is included, featuring typically 80 µA standby current. Self protection features include a two stage frequency reducing current limit for the output switch and an over temperature shutdown.

National LM2597/LM2597HV Manual(1)(1)

The LM2597/LM2597HV series are monolithic integrated circuits that provide all the active functions for a step-down (buck) switching regulator, capable of driving a 0.5A load with excellent line and load regulation. These devices are available in fixed output voltages of 3.3V, 5V, 12V, and an adjustable output version, and are packaged in an 8-lead DIP and an 8-lead surface mount package. This series of switching regulators is similar to the LM2594 series, with additional supervisory and performance features added. Requiring a minimum number of external components, these regulators are simple to use and include internal frequency compensation†, improved line and load specifications, fixed-frequency oscillator, Shutdown /Soft-start, error flag delay and error flag output. The LM2597/LM2597HV series operates at a switching frequency of 150 kHz thus allowing smaller sized filter components than what would be needed with lower frequency switching regulators. Because of its high efficiency, the cop- per traces on the printed circuit board are normally the only heat sinking needed. A standard series of inductors (both through hole and sur- face mount types) are available from several different manu- facturers optimized for use with the LM2597/LM2597HV se- ries. This feature greatly simplifies the design of switch-

National LM2597/LM2597HV Manual(1)

LM2597/LM2597HV is a monolithic integrated circuit that provides all the active functions for a step-down (buck) switching regulator. It is capable of driving a 0.5A load with excellent line and load regulation, and supports 3.3V, 5V, 12V fixed output and adjustable output. It also features internal frequency compensation, improved line and load specifications, fixed-frequency oscillator, Shutdown /Soft-start, error flag delay and error flag output.

National Semiconductor LM1276 handbook

LM1276 150MHz I2C compatible RGB preamplifier with internal 512 character OSD ROM, 512 character RAM and 4 DACs

National Semiconductor LM1270 handbook(1)(1)

The LM1270 is a supplementary IC to the low cost chipset (LCCS). It modifies the video stream prior to the LCCS preamplifier and enhances pictures or motion video through special intermediate frequency boosting. The LM1270 also has other functions such as measuring the length of active video and front porch time, calibration mode for determining image coordinates, data receiver for receiving data encoded on video, window highlight feature, and video source selection.

National Semiconductor LM1270 handbook(1)

The LM1270 is a supplementary IC to the low cost chipset (LCCS). It modifies the video stream prior to the LCCS preamplifier and enhances pictures or motion video through special intermediate frequency boosting. The 200 MHz bandwidth ensures minimal impact on the video change when adding the LM1270. Other functions include measuring the length of the active video and its front porch time, calibration mode for determining image coordinates, data receiver for receiving encoded data on video, window highlight with respect to sync, and video source selection with two analog inputs.