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:
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