Controller simplifies convertor design

Edited by the Electronicstalk editorial team Oct 27, 2004

The LT1952 is a current mode PWM controller optimised for forward convertor topology power supply design.

The LT1952 is a current mode PWM controller optimised for forward convertor topology power supply design.

The LT1952 uses only one primary side MOSFET and provides synchronous rectifier control for high operating efficiency without need for an external MOSFET driver or timing circuitry.

A programmable volt-second clamp provides a safeguard for transformer reset that prevents saturation and protects the MOSFET.

Moreover, this function allows the use of the smallest transformer, MOSFET and rectifiers, resulting in minimum space for a given output power.

The LT1952 simplifies design of 25 to 300W power supplies such as isolated 48V input to 12, 5 or 3.3V output in industrial or telecomms applications.

The LT1952 includes a soft-start function for a controlled exit from shutdown, overcurrent conditions and undervoltage lockout.

To improve efficiency while starting conversion from high input voltages, the LT1952 features a micropower 460uA startup current.

Because of its programmable slope compensation, leading edge blanking and a true error op amp, a wide range of inductors and MOSFETs can be used without jeopardising circuit stability.

The LT1952 is available in a 16-lead SSOP and is operational from -40 to +85C.

1000-piece price starts at $3.30.