Half-Bridge Driver Cancels Common-Mode Noise

Dec 6, 2006 12:36 PM

Fairchild Semiconductor’s high-voltage gate driver ICs feature a common-mode dv/dt noise-canceling circuit for achieving noise immunity. The FAN7383, FAN7384 and FAN73832 offer savings of 50% pc board area compared to optocoupler or pulse transformer-based solutions.

Fairchild's HVICs are the optimal solution for driving MOSFETs and IGBTs in a wide array of consumer and industrial applications up to 600 V. These include inverter motor drives, switch-mode power supplies (SMPS) and electronic ballasts.

Fairchild's HVICs feature level-shift circuitry for high-side driver operation with negative V_S swings of up to -9.8 V (at V_BS = 15 V). This results in the devices' ability to eliminate an extra diode. In addition, these HVICs provide noise immunity by utilizing a common-mode dv/dt noise-canceling circuit.

To further enhance efficiency, these HVICs include a floating channel designed for bootstrap operation to +600 V. They also increase reliability by providing under-voltage lockout (UVLO) on both channels, and an 11-V to 20-V supply range for V_CC.

Both the FAN7383 and FAN73832 source and sink 350 mA and 650 mA, respectively. The FAN7384 can source 250 mA and sink 500 mA.

The FAN7383 is available in a 14-SOP package for $0.78. The FAN7384 is also packaged in a 14-SOP and is priced at $0.80. The FAN73832 can be housed in either a 8-SOP or and 8-DIP package; it is priced at $0.78.