OB2263
Current Mode PWM Controller
Frequency Shuffling
•
Protection Controls
Good power supply system reliability is achieved
with its rich protection features including Cycle-by-
Cycle current limiting (OCP), Over Load
Protection (OLP) and over voltage clamp, Under
Voltage Lockout on VDD (UVLO).
With On-Bright Proprietary technology, the OCP
threshold tracks PWM Duty cycles and is line
voltage compensated to achieve constant output
power limit over the universal input voltage range
with recommended reference design.
At overload condition when FB input voltage
exceeds power limit threshold value for more than
TD_PL, control circuit reacts to shut down the
output power MOSFET. Device restarts when VDD
voltage drops below UVLO limit.
VDD is supplied by transformer auxiliary winding
output. It is clamped when VDD is higher than
threshold value. The power MOSFET is shut down
when VDD drops below UVLO limit and device
enters power on start-up sequence thereafter.
On
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©On-Bright Electronics
Confidential
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