High Voltage Green Mode PWM Controller
OB5269 is a highly integrated current mode PWM ■ High Voltage Startup
control IC with high voltage start up, optimized for ■ Power on Soft Start Reducing MOSFET Vds
high performance, low standby power
consumption and cost effective offline flyback
PWM switching frequency at normal operation is
internally fixed and is trimmed to a tight range. At
no load or light load condition, the IC operates in
extended ‘burst mode’ to minimize switching loss.
Very low standby power consumption and very
high conversion efficiency is thus achieved.
Ktec Frequency shuffling for EMI
Extended Burst Mode Control For Improved
Efficiency and Minimum Standby Power
Audio Noise Free Operation
Fixed 65KHZ Switching Frequency
Comprehensive Protection Coverage
o VDD Under Voltage Lockout with
High voltage startup is implemented in OB5269,
which features with short startup time and low
to OB5269 offers complete protection coverage with
auto-recovery including Cycle-by-Cycle current
l limiting (OCP), over load protection (OLP), and
VDD under voltage lockout (UVLO). It also
tia provides the protections with latched shut down
including over temperature protection (OTP), and
over voltage (fixed or adjustable) protection (OVP).
Excellent EMI performance is achieved with On-
n Bright proprietary frequency shuffling technique.
The tone energy at below 22KHZ is minimized to
e avoid audio noise during operation.
fid OB5269 is offered in SOP8 package.
o Cycle-by-cycle over current protection
o Overload Protection (OLP) with auto-
o Over Temperature Protection (OTP) with
latch shut down
o VDD Over voltage Protection(OVP) with
latch shut down
o Adjustable OVP through external Zener
Offline AC/DC flyback converter for
■ Battery Charger
■ Power Adaptor
■ Open-frame SMPS
On-Bright Con TYPICAL APPLICATION