Description
The HW9315B is a high precision non-isolated buck
driver with active PFC, specially designed for
universal input offline constant current LED lighting.
The driver with on-chip PFC circuit achieves high
power factor and low THD. Operating in critical
conduction mode, the power MOSFET switching loss
is reduced and the inductor is fully utilized.
The HW9315B integrates a 550V power MOSFET.
With few external components, the LED output
current can be precisely controlled.
The inductor current is sensed during the whole
switching cycle. So it achieves high precision output
current control, and excellent line regulation and load
regulation.
The HW9315B offers rich protection functions to
improve the system reliability, including LED open
circuit protection, LED short circuit protection, VCC
over voltage protection, VCC under voltage
protection, CS resistor open protection, Over
temperature protection function and cycle by cycle
current limit. All the protection functions are
auto-recovery. Ensure that the system is reliable.

Features
Active PFC for High Power Factor and Low
THD
Internal 550V Power MOSFET
System Efficiency up to 95%
±3% LED Output Current Accuracy
Excellent Line and Load Regulation
Critical Conduction Mode Operation
LED Short/Open Protection
Current Sensing Resistor Open Protection
Cycle by Cycle Current Limit
VCC Under Voltage Protection
Auto Fault Recovery
Over temperature protection function
Available in SOP-8 Package
Applications
GU10/E27 LED Bulb, Spot Light
PAR30, PAR38 Lamp
T8/T10 LED String
Other LED Lighting