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OB6563 is an active transition-mode (TM) power factor
correction (PFC) controller for AC-DC switching mode
power supply applications.
OB6563 features an internal start-up timer for standalone
applications, a one quadrant multiplier with THD
optimizer for near unity power factor, zero current
detector (ZCD) to ensure TM operation, a current
sensing comparator with built-in leading-edge blanking,
and a totem pole output ideally suited for driving a
power MOSFET.
OB6563 offers great protection coverage including
system over-voltage protection (OVP) to eliminate
runaway output voltage due to load removal, VCC under
voltage lockout (UVLO), cycle-by-cycle current limiting,
multiplier output clamping that limit maximum peak
switch current, and gate drive output clamping for
external power MOSFET protection.
With added system open loop protection feature,
OB6563 shuts down system when the feedback loop is
open.
In OB6563, the dynamic OVP sensing current is set to
10uA, which will decrease system standby power greatly.
When used with On-Bright PWM controller OB2298 or
Quasi-Resonant controller OB2203 in a 150W AC/DC
power design, it can deliver <0.4W standby power at
universal AC range input.
correction (PFC) controller for AC-DC switching mode
power supply applications.
OB6563 features an internal start-up timer for standalone
applications, a one quadrant multiplier with THD
optimizer for near unity power factor, zero current
detector (ZCD) to ensure TM operation, a current
sensing comparator with built-in leading-edge blanking,
and a totem pole output ideally suited for driving a
power MOSFET.
OB6563 offers great protection coverage including
system over-voltage protection (OVP) to eliminate
runaway output voltage due to load removal, VCC under
voltage lockout (UVLO), cycle-by-cycle current limiting,
multiplier output clamping that limit maximum peak
switch current, and gate drive output clamping for
external power MOSFET protection.
With added system open loop protection feature,
OB6563 shuts down system when the feedback loop is
open.
In OB6563, the dynamic OVP sensing current is set to
10uA, which will decrease system standby power greatly.
When used with On-Bright PWM controller OB2298 or
Quasi-Resonant controller OB2203 in a 150W AC/DC
power design, it can deliver <0.4W standby power at
universal AC range input.
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