High Power Factor Flyback LED Controller with HV Start-Up
The LD7838 is a 700V HV start-up flyback PFC controller, specially designed for LED lighting.
This device operates in transition mode (TM) and integrates with complete protections required.
It minimizes the component counts and makes it easy to design cost-effective applications.
With HV start-up technology, high power factor and TM control, the start-up time and resistor loss could be minimized efficiently.
The circuit can easily achieve PF > 0.9 to meet most of the international standard requirements.
With complete protection built inside this IC, such as over voltage protection (OVP), over current protection(OCP), over load protection (OLP),
over temperature protection (OTP), and short circuit protection (SCP), it enable the circuit to meet most safety requirements in both normal
and abnormal test.
The IC is available in SMD. LD7838 GR in SOP-7 package.
FEATURES
▲ High voltage (700V) start-up circuit for 305VAC
▲ High power factor flyback PFC controller
▲ High efficiency transition mode operation
▲ Power saving < 0.5W at Po = 100mW
▲ Accurate OLP compensation for high/low line
▲ BNI/BNO function
▲ Wide UVLO (16V on and 8V off)
▲ VCC OVP (Over Voltage Protection)
▲ OLP (Over Load Protection)
▲ Adjustable OCP (Cycle by Cycle Current Limit) Vcs 0.85V
▲ Internal OTP (Over Temperature Protection)
APPLICATIONS
▲ LED power supply
▲ LED light bulb / tube
Datasheet 
