The FAN6248HAMX from Fairchild Semiconductor is an advanced synchronous rectifier (SR) controller for LLC resonant converter SOIC-8 package. It has two driver stages for driving the SR MOSFETs which are rectifying the outputs of the secondary transformer windings. The two gate driver stages have their own sensing inputs and operate independently of each other. The adaptive parasitic inductance compensation function minimizes body diode conduction maximizing the efficiency. The advanced control algorithm allows stable SR operation over entire load range. It has low operating current in green mode (typ. 350µA), -0.7 to 100V drain dense input pin voltage, 4.5V VDD rising turn-on threshold, 4.2V VDD falling turn-off threshold. Typical applications include high power density laptop adapter, high power density adapter, large screen LCD-TV, PDP-TV, RP-TV power, high efficiency desktop and server power supplies, networking and telecom power supplies, high power LED lighting.
Feature
- Highly integrated self-contained control of synchronous rectifier with minimum external component
- Higher turn-off threshold voltage, 130mV / 228mV VTH_OFF1 / VTH_OFF2, 380ns tON_DLY2
- Anti shoot-through control for reliable SR operation
- Separate 100V rated sense inputs for sensing the drain and source voltage of each SR MOSFET
- Adaptive parasitic inductance compensation to minimize the body diode conduction
- SR current inversion detection under light load condition
- Adaptive minimum on time for noise immunity, 0 to 27V VDD pin supply voltage to GND
- Operating voltage range up to 30V, operating frequency range from 25KHz up to 700KHz
- Low start-up and stand-by current consumption, operating ambient temperature from -40°C to 125°C
- High driver output voltage of 10.5V to drive all MOSFET brands to the lowest RDS_ON
Applications
Power Management
