LTC Intros New LT1952 Current-Mode PWM Controller

Linear Technology Corp. (LTC, Milpitas, CA) introduced its LT1952, a current-mode PWM controller optimized for forward converter 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. The LT1952 simplifies design of 25 W to 300 W power supplies such as isolated 48 V input to 12 V, 5 V or 3.3 V output in industrial or telecom applications.

The LT1952 includes soft-start function for a controlled exit from shutdown, over-current conditions and under-voltage lockout. To improve efficiency while starting conversion from high input voltages, the LT1952 features a micropower 460 µA 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 jeopardizing circuit stability.

The LT1952 is available in a 16-lead SSOP and is operational from -40 °C to +85 °C. Pricing for 1,000-piece quantities starts at $3.30.