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PWM controller uses only one primary side MOSFET

Posted: 01 Oct 2004 ?? ?Print Version ?Bookmark and Share

Keywords:linear technology? lt1952? pwm controller?

Optimized for forward converter topology power supply design, the latest current mode PWM controller from Linear Technology Corp. 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 in the LT1952 controller 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. According to Linear Tech, the LT1952 simplifies design of 25W to 300W power supplies such as isolated 48V input to 12V, 5V or 3.3V output in industrial or telecom applications.

The new product 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 460?A start-up current.

Rated for operation between the -40C to 85C temperature range, the LT1952 is available in a 16-lead SSOP, with prices starting at $3.30 in 1,000-piece orders.

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