Catalog
SIMPLE SWITCHER® CONTROLLER, 42V Synchronous Step-Down
Key Features
• PowerWise®step-down controller6V to 42V Wide input voltage rangeFixed output voltage of 3.3VFixed switching frequencies of 250 kHz/500 kHz/750 kHzNo loop compensation requiredFully WEBENCH®enabledLow external component countConstant On-Time controlUltra-Fast transient responseStable with low ESR capacitorsOutput voltage pre-bias startupValley current limitProgrammable soft-startTypical ApplicationsTelecomNetworking EquipmentRoutersSecurity SurveillancePower ModulesPowerWise®step-down controller6V to 42V Wide input voltage rangeFixed output voltage of 3.3VFixed switching frequencies of 250 kHz/500 kHz/750 kHzNo loop compensation requiredFully WEBENCH®enabledLow external component countConstant On-Time controlUltra-Fast transient responseStable with low ESR capacitorsOutput voltage pre-bias startupValley current limitProgrammable soft-startTypical ApplicationsTelecomNetworking EquipmentRoutersSecurity SurveillancePower Modules
Description
AI
The LM3151/2/3 SIMPLE SWITCHER®Controller is an easy to use and simplified step down power controller capable of providing up to 12A of output current in a typical application. Operating with an input voltage range from 6V-42V, the LM3151/2/3 features a fixed output voltage of 3.3V, and features switching frequencies of 250 kHz, 500 kHz, and 750 kHz. The synchronous architecture provides for highly efficient designs. The LM3151/2/3 controller employs a Constant On-Time (COT) architecture with a proprietary Emulated Ripple Mode (ERM) control that allows for the use of low ESR output capacitors, which reduces overall solution size and output voltage ripple. The Constant On-Time (COT) regulation architecture allows for fast transient response and requires no loop compensation, which reduces external component count and reduces design complexity.
Fault protection features such as thermal shutdown, under-voltage lockout, over-voltage protection, short-circuit protection, current limit, and output voltage pre-bias startup allow for a reliable and robust solution.
The LM3151/2/3 SIMPLE SWITCHER®concept provides for an easy to use complete design using a minimum number of external components and National’s WEBENCH®online design tool. WEBENCH®provides design support for every step of the design process and includes features such as external component calculation with a new MOSFET selector, electrical simulation, thermal simulation, and Build-It boards for prototyping.
The LM3151/2/3 SIMPLE SWITCHER®Controller is an easy to use and simplified step down power controller capable of providing up to 12A of output current in a typical application. Operating with an input voltage range from 6V-42V, the LM3151/2/3 features a fixed output voltage of 3.3V, and features switching frequencies of 250 kHz, 500 kHz, and 750 kHz. The synchronous architecture provides for highly efficient designs. The LM3151/2/3 controller employs a Constant On-Time (COT) architecture with a proprietary Emulated Ripple Mode (ERM) control that allows for the use of low ESR output capacitors, which reduces overall solution size and output voltage ripple. The Constant On-Time (COT) regulation architecture allows for fast transient response and requires no loop compensation, which reduces external component count and reduces design complexity.
Fault protection features such as thermal shutdown, under-voltage lockout, over-voltage protection, short-circuit protection, current limit, and output voltage pre-bias startup allow for a reliable and robust solution.
The LM3151/2/3 SIMPLE SWITCHER®concept provides for an easy to use complete design using a minimum number of external components and National’s WEBENCH®online design tool. WEBENCH®provides design support for every step of the design process and includes features such as external component calculation with a new MOSFET selector, electrical simulation, thermal simulation, and Build-It boards for prototyping.
