FAN6747

The highly integrated FAN6747 PWM controller provides several features to enhance the performance of flyback converters. To minimize standby power consumption, a proprietary green-mode function provides off-time modulation to decrease the switching frequency with load condition.
Under zero-load condition, the power supply enters burst mode and burst frequency can be low to save more power. Green-mode function enables the power supply to meet international power conservation requirements.
The FAN6747 is especially designed for SMPS with peak-current output. It incorporates a cycle-by-cycle current limiting and two-level Over-Current-Protection (OCP) that can handle peak load with a debounce time. Once the current is over the threshold level, it triggers the first counter 15ms and checks if V_DDis below 10V; if it is, the PWM latches off for SCP. If V_DD is higher than 10V; it keeps counting to 220ms, then the PWM latches off for OCP.
FAN6747 also integrates a frequency-hopping function internally to help reduce EMI emission of a power supply with minimum line filters. Built-in proprietary internal synchronized slope compensation achieves constant output power limit over universal AC line range. The gate output is clamped at 14V to protect the external MOSFET from over-voltage damage.
Other protection functions include AC-line brownout protection with hysteresis and V_DD over-voltage protection. For over-temperature protection, an external NTC thermistor can be applied to sense the ambient temperature. When OCP, OVP, SCP, or OTP is activated, an internal latch circuit latches off the controller. The latch is reset when the V_DD supply is removed.

• Fairchild 1,000 piece Budgetary Pricing. *
• If there is no sample button displayed at the top of the page, please contact one of the Fairchild distributors or your local sales office to obtain samples.
• Top mark packaging information for product FAN6747 is available. **

Product	Product Status	Eco Status	*Pricing	Package Type	Leads	Packing Method	Package Drawing	**Package Marking Convention	RoHS IPC1752	RoHS/REACH/JIG Certificate of Compliance
FAN6747LMY	Full Production	Green as of Oct 2009	$0.55	SO-8	8	TAPE REEL		Line 1:$Y (Fairchild logo) &Z (Asm. Plant Code) &2 (2-Digit Date Code) &K Line 2:6747L Line 3:MYA