FSDH321_04 FAIRCHILD [Fairchild Semiconductor], FSDH321_04 Datasheet - Page 7

• Manufacturer Part Number: FSDH321_04
• Description: Green Mode Fairchild Power Switch
• Manufacturer: FAIRCHILD [Fairchild Semiconductor]

Comparison Between FSDM311 and FSDx321
Function
Soft-Start
External Current Limit
Frequency Modulation
Burst Mode Operation
Drain Creepage at
Package
15mS
not applicable
not applicable
Yes-built into
controller
7.62mm
FSDM311
15mS
Programmable of
default current limit
±1.5KHz @50KHz
±3.0KHz @100KHz
Yes-built into
controller
7.62mm
FSDx321
• Eliminates external components used
• Reduces or eliminates output
• Smaller transformer
• Allows power limiting (constant over-
• Allows use of larger device for lower
• Reduced conducted EMI
• Improve light load efficiency
• Reduces no-load consumption
• Transformer audible noise reduction
• Greater immunity to arcing as a result
• Gradually increasing current limit
during soft-start further reduces peak
current and voltage component
stresses
for soft-start in most applications
overshoot
load power)
losses and higher efficiency.
of build-up of dust, debris and other
contaminants
FSDx321 Advantages
FSDH321, FSDL321
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