Date: 21/12/2009

New PWM controller from Fairchild semiconductor for switch-mode power supplies

Fairchild Semiconductor has introduced the FAN6754, a new pulse-width modulated (PWM) controller that includes the ENERGY STAR External Power Supply (EPS) version 2.0 requirement that mandates 87 percent average active-mode efficiency to obtain compliance.

The FAN6754 offers high-voltage startup to improve energy savings at light load by 25 percent when compared to alternate solutions, and also eliminates external protection circuits by incorporating over-voltage, over-current and over-temperature protection plus brownout and line-compensation functions.

The key features of the FAN6754 PWM controller are,

AC input brownout protection with hysteresis
1.7mA of low operating current
Linearly decreasing PWM frequency to 22 KHz
Frequency hopping to reduce EMI emission
Fixed PWM frequency of 65 KHz
Peak current-mode control
Cycle-by-Cycle current limiting
Leading-edge blanking (LEB)
Internal open-loop protection
GATE output maximum voltage clamp of 13V
VDD Under-Voltage Lockout (UVLO)
VDD Over-Voltage Protection (OVP)
Programmable Over-Temperature Protection (OTP)
Internal Latch Circuit (OVP, OTP)
Open-Loop Protection (OLP); Restart for MR, Latch for ML
Built-in 8ms Soft-Start function

The FAN6754 PWM device is suitable for general-purpose switch-mode power supplies and flyback power converters, including power adapters.

Fairchild's FAN6754 PWM devices also offer a host of robust, accurate protection features built-in to protect the power supply and the load from failure, all without adding external components or circuitry.

Price: Each $0.42 for 1k pieces
Availability: Now in samples

For more details visit www.fairchildsemi.com