OB2273 Series
High Performance Current Mode PWM Controller


OB2273 is a highly integrated current mode PWM control IC optimized for high performance, low standby power(less than 100mW) and cost effective offline flyback converter applications. It offers complete protection coverage with auto-recovery including Cycle-by-Cycle current limiting (OCP), over load protection (OLP), and VDD under voltage lockout (UVLO). It also provides the protections with latched shut down including over temperature protection (OTP), and over voltage (fixed or adjustable) protection (OVP).


Features:

Power on Soft Start Reducing MOSFET Vds Stress
Frequency shuffling for EMI
Extended Burst Mode Control For Improved Efficiency and Minimum Standby Power Design
Audio Noise Free Operation
Fixed 65KHZ Switching Frequency
Comprehensive Protection Coverage
VDD Under Voltage Lockout with Hysteresis (UVLO)
Cycle-by-cycle over current threshold setting for constant output power limiting over universal input voltage range
Overload Protection (OLP) with auto-recovery
Over Temperature Protection (OTP) with latch shut down
VDD Over voltage Protection(OVP) with latch shut down
Adjustable OVP through external Zener
Available in SOT23-6 and DIP8 packages, RoHS compliant


Applications:

Offline AC/DC flyback converter for
LED Monitor Power Supplier
Netbook/Tablet PC Adapter
Battery Charger
Power Adapter
Set-Top Box Power Supplies
Open-frame SMPS

Device
VDD OVP
OTP
Brownout
Frequency
OB2273
Latch
Latch
--
65kHz
OB2273A
Auto-recovery
Auto-recovery
--
65kHz
OB2273F
Auto-recovery
--
--
External
OB2273B
Auto-recovery
--
Y
65kHz



Typical Application: