Comparison of FL6961 and FL7930C
Function
PFC Ready Pin
FL6961
None
Frequency Limit
None
VIN-Absent Detection
None
Soft-Start and
Startup without
Overshoot
THD Optimizer
TSD
Control Range
Compensation
None
External
None
None
FL7930C
FL7930C Advantages
! No External Circuit for PFC Output UVLO
Integrated
! Reduce Power Loss and BOM Cost Caused by
PFC Out UVLO Circuit
! Versatile Open-Drain Pin
! Abnormal CCM Operation Prohibited
Integrated
! Abnormal Inductor Current Accumulation Can Be
Prohibited
Integrated
! Increase System Reliability by Testing for Input
Supply Voltage
! Guarantee Stable Operation at Short Electric
Power Failure
! Reduce Voltage and Current Stress at Startup
Integrated
! Eliminate Audible Noise due to Unwanted OVP
Triggering
Internal
! No External Resistor Needed
140°C with 60°C ! Stable and Reliable TSD Operation
Hysteresis
! Converter Temperature Range Limited Range
Integrated
Comparison of FL7930B and FL7930C
Function
FL7930B
FL7930C
RDY Pin
None
Integrated
OVP Pin
Integrated
None
FL7930C Remark
! If PFC Rated Output Voltage is Assumed 390 V:
VRDY_HIGH Trigger Voltage = 349 V,
VRDY_LOW Trigger Voltage = 320 V
www.onsemi.com
7