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  LT2H1002系列

測試內容
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: